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... Malus × domestica 'Honeycrisp' was first planted in Washington State, USA, in 1999. The growth of planted orchard area since then has been exponential and now totals over 5,000 ha. In the first decade of commercial production, the entire crop was shipped from storage within the first three months after harvest due to high consumer demand. Despite rapidly expanding production, market demand still g ...
... Sooty blotch and flyspeck (SBFS) fungi colonise the surface of a range of fruits, especially apple, without penetrating the cuticle. Economic damage results from the exclusion of severely affected fruit batches from being marketed as table apples. A study of SBFS was conducted in 2007–2012 in the two largest German apple production areas, i.e. the Lake Constance and Lower Elbe regions. The absence ...
... The study was conducted during the period 2010-2014 in an apple plantation of the Institute of Agriculture - Kyustendil (Bulgaria). The aim was to characterize five newly introduced apple cultivars under the conditions of the region. The apple trees (5 of each cultivar) were grafted on rootstock MM 106 and planted in 2002 at the distance 4.5×2.4 m. ‘Prima’ and ‘Granny Smith’ were used as standards ...
... Fire blight is the most damaging bacterial disease in apple production worldwide. Cankers and symptomless infected shoots are known as sites for the overwintering of Erwinia amylovora, subsequently providing primary inoculum for infection in the spring. In the present work, further potential sources of inoculum were investigated. Real‐time PCR assays covering a 3‐year‐period classified 19·9% of sa ...
... Red colouration is a prime consideration for the consumer when purchasing any fruit, whether tomato, pepper, strawberry or apple. Phosphonates, previously used to enhance fruit colouration e.g. in apple, have now been classified by the EU as plant protection agents, which implies scrutiny of treated fruit to residues.Therefore, two phosphonate-free, potentially colour enhancing agents, i.e. WuxalP ...
... BACKGROUND: The transition from vegetative to floral state in shoot apical meristems (SAM) is a key event in plant development and is of crucial importance for reproductive success. In perennial plants, this event is recurrent during tree life and subject to both within-tree and between-years heterogeneity. In the present study, our goal was to identify candidate processes involved in the repressi ...
Apple chlorotic leaf spot virus; Apple mosaic virus; Apple stem grooving virus; Malus domestica; clones; haplotypes; plant diseases and disorders; plant viruses; single-stranded conformational polymorphism; temperature; thermotherapy; viral morphology; viruses
Abstract:
... Pre-thermotherapy apple plants and their homologous regenerated virus-infected apple plants were used to analyze the effect of high temperature on the structure of plant virus variants. The target bands of apple chlorotic leaf spot virus (ACLSV), apple stem grooving virus (ASGV), and apple mosaic virus (ApMV) in the plants of the two populations were purified and cloned, and 16 positive clones of ...
... Flood-induced flowering is a common forcing technique used for off-season production of wax apples (Syzygium samarangense). Research on the effect of such imposed flood stress on roots is crucial to avoid permanent root damage of these perennial trees. Therefore, it is fundamental to study wax apple root response to flooding since tree vigor and steady production highly depend on maintaining a hea ...
... In a previous study (Mikiciński et al. in Eur J Plant Pathol, doi: 10.1007/s10658-015-0837-y , 2015), we described the characterization of novel strain 49M of Pseudomonas graminis, isolated from the phyllosphere of apple trees in Poland showing a good protective activity against fire blight on different organs of host plants. We now report investigations to clarify the basis for this activity. Str ...
... Ripening in climacteric fruit requires the gaseous phytohormone ethylene. Although ethylene signaling has been well studied, knowledge of the transcriptional regulation of ethylene biosynthesis is still limited. Here we show that an apple (Malus domestica) ethylene response factor, MdERF2, negatively affects ethylene biosynthesis and fruit ripening by suppressing the transcription of MdACS1, a gen ...
... The non-expressor of pathogenesis-related genes 1 (NPR1) plays essential roles in the salicylic acid (SA) signal pathway and in systemic acquired resistance (SAR) responses. Although a genome-wide analysis of NPR1 gene family has been conducted in some plant species, little is known about these genes in apple (Malus spp.). In this study, eight NPR1 homologs were identified within the apple genome ...
... Infestations by the green-apple aphid, Aphis pomi, and the rosy-apple aphid, Dysaphis plantaginea, have caused serious damage to apple trees in Bulgaria. Resistance to major pests and diseases has been considered one of the most important goals of apple breeding programmes. From 2011 to 2013, experiments were conducted in an orchard of apple hybrids where no pesticides were applied and under contr ...
Malus domestica; apples; branches; cameras; canopy; computer vision; harvesting; image analysis; labor; leaves; lighting; orchards; planning; solar radiation; trees
Abstract:
... Accurate crop-load estimation is important for efficient management of pre- and post-harvest operations. This information is crucial for the planning of labor and equipment requirement for harvesting and transporting fruit from the orchard to packing house. Current machine vision-based techniques for crop-load estimation have achieved only limited success mostly due to: (i) occlusion of apples by ...
... Valsa canker caused by the necrotrophic ascomycete Valsa mali is a destructive disease on apple in eastern Asia. To date, the disease still cannot be effectively controlled, mainly because V. mali extensively penetrates into the phloem and xylem and limited information about the resistance mechanism is available. In this study, we analyzed the transcriptome of V. mali-infected apple (Malus x domes ...
Malus domestica; abscisic acid; carbon; climate change; cultivars; drought; drought tolerance; dwarfing; fine roots; glucose; greenhouse experimentation; humans; irrigation; irrigation water; leaf water potential; leaves; metabolism; metabolites; phaseic acid; root systems; rootstocks; scions; soil water; stomatal conductance; stomatal movement; trees; water stress; water use efficiency
Abstract:
... Water for irrigation will likely be less available in apple-growing regions due to climate change and competition with human needs other than agriculture. Apple cultivars and rootstocks may differ in water use necessary for acceptable cropping. In two greenhouse experiments in 2014 and 2015 rootstocks (M.9 and MM.111) and scions (‘Gala’ and ‘Fuji’) with known differences in size control and potent ...
... Adequate protection of apple trees during the primary contamination period is a cornerstone for management of apple scab. Correct timing of spring treatments is fundamental and thus, much effort has been devoted to forecasting ascospore release by Venturia inaequalis. Most models rely on degree‐day accumulation starting from a biofix date established yearly on the basis of biological observations. ...
... The paper presents the results of the research on the impact of enzymatic liquefaction, freezing and thawing on the efficiency of juice pressure extraction from apple pulp and quality of the obtained juices. The research was conducted using three types of pretreatment prior the pressing: crushing and enzymatic liquefaction in temperature of 25 °C, crushing and enzymatic liquefaction in temperature ...
... AIMS: Arbuscular mycorrhizal fungi (AMF) play a key role in the functioning of agricultural ecosystems. Therefore, understanding how the application of fertilizers, a common management practice, affects AMF communities is of major importance. Here we aimed to: (i) experimentally test whether different amounts and forms of phosphorus (P) fertilizer affect AMF diversity and community composition ass ...
... Aroma is an important quality factor in fruit, and it is important to know the effect of new orchard management practices on fruit aroma. Fruit growers are using more foliar fertilizers to achieve the optimum mineral status in fruit. In this work the effects of adding extra nitrogen, calcium and both nitrogen and calcium to apple trees in the fruit cell division phase were studied. Even though the ...
Malus domestica; apples; budbreak; buds; canopy; dry matter accumulation; fruit drop; fruiting spurs; leaf area; light intensity; orchards; tree growth; trees; winter; New Zealand
Abstract:
... Total dry matter production by apple orchards is positively related to light interception. Consequently, maximising light interception is important in commercial apple orchards, as it directly affects tree growth and yield. Artificial spur extinction (ASE) is a method of crop load control that reduces the density and alters distribution of floral buds in whole trees. Because ASE reduces total bud ...
... The large commercial success of pomegranate increase the likelihood of economically motivated adulteration (EMA), which has been gradually spotted with the undeclared addition of anthocyanin-rich plants or cheaper fruit juices used as bulking and diluting agents. A method based on Sequence-Characterized Amplified Regions (SCARs) was developed to detect the presence of Aristotelia chilensis, Aronia ...
... A prerequisite for reliable hydraulic measurements is an accurate collection of the plant material. Thereby, the native hydraulic state of the sample has to be preserved during harvesting (i.e., cutting the plant or plant parts) and preparation (i.e., excising the target section). This is particularly difficult when harvesting has to be done under transpiring conditions. In this article, we presen ...
Luvisols; Malus domestica; apples; biochar; composts; fruit growing; fruit yield; leaves; nutrient content; orchards; plant growth; planting; replant disease; soil fertility; trees
Abstract:
... In fruit growing areas, the new establishment of apple orchards on soils previous planted with apple trees is problematic, because plant vitality, yield, and fruit quality of the new planted trees are suppressed through specific apple replant diseases. We hypothesized that the addition of biochar mixed with compost could help to combat the negative impact of replant disease by improving soil ferti ...
... Fruit quality is a combination of several features impacting the general consumers’ appreciation, and it is thought as the final result of a complex physiological mechanism ongoing during the entire ontogenic life cycle. In the horticultural management apples are normally stored for a long period, ensuring the availability of fresh fruit on the market over a year-round period. In this context, the ...
... KEY MESSAGE : Dwarf interstock produced smaller tree size and a more uniform leaf area spatial distribution of vegetative short shoot. These improved light interception and increased light partitioning to fruiting shoot. The agronomic efficiency of dwarf interstocks is controversial in China, where almost 90 % of apple orchards, including high-density orchards, currently use vigorous rootstock. We ...
... For the first time, an in vivo sampling mode of direct immersion–solid phase microextraction (DI-SPME) was employed to capture the metabolome of living plant specimens, using apple (Malus × domestica Borkh.) as a model system. Metabolites were extracted from apple tissues and introduced by thermal desorption into a comprehensive two-dimensional gas chromatography–time-of-flight mass spectrometry i ...
... Apple (Malus × domestica Borkh.) is a species possessing S-RNase-based self-incompatibility. Knowledge of the S-genotype of cultivars is very important both for breeders and growers, in order to plan compatible crosses and cultivar combinations. Here we report a revision of the S-genotype of the cultivar Murray which is in disagreement with previous reports, and the characterization of the newly i ...
... Greenhouse-grown, 1-year-old potted ‘Bosc’ pear and apple rootstock cultivars ‘M.9’ and ‘M.26’ were inoculated with the fire blight pathogen, Erwinia amylovora, and subjected to trunk paint, root drench, or foliar spray treatments with acibenzolar-S-methyl (ASM, 4 to 30 mg a.i./tree) to induce systemic acquired resistance. Each method of ASM treatment suppressed fire blight canker expansion by 22 ...
... Incorporating nonprey sugar resources into apple orchards is a potential means of enhancing biological control services, but little is known about the impacts of extrafloral nectars on aphidophagous coccinellids. We explored peach Prunus persica (L.) Batsch extrafloral nectar as a supplemental resource for Harmonia axyridis (Pallas), a key aphid predator in the mid-Atlantic United States. Extraflo ...
... Some strains of Cherry leaf roll virus (CLRV) are considered as quarantine pests in New Zealand. CLRV was detected in seven plant host species: Actinidia chinensis, Hydrangea macrophylla, Malus domestica, Plantago major, Ribes rubrum, Rubus idaeus and Rumex sp. collected from New Zealand between 2005 and 2012. Biological, serological and molecular techniques were compared for the detection and dif ...
Malus domestica; bark; callus; callus formation; cracking; landscapes; monitoring; tree injection; trees
Abstract:
... Excessive tree wounding is a common concern regarding the use of trunk injection technology for tree protection purposes in landscapes and urban greening. We investigated the rate of healing of injection ports (points) in apple trees by monitoring parameters such as port diameters, the size of bark cracking, and port depths. We compared drilled injection ports from 4.4 and 9.5mm drill bits, with l ...
Malus domestica; algorithms; apples; automation; evapotranspiration; growing season; growth retardation; irrigation scheduling; irrigation water; leaves; microirrigation; models; orchards; small fruits; soil water; soil water balance; soil water content; user interface; water potential; water stress; weather; Washington (state)
Abstract:
... Seven irrigation scheduling algorithms and an automatic control system along with a wireless network of soil, thermal and weather sensors were developed and assessed in Prosser, WA in the growing season of 2013. The system was comprised of six wireless sensor and valve actuating nodes installed across an apple orchard, a central base station made up of a transceiver connected to a laptop, and a gr ...
... Argonaute proteins are key players in small RNA-guided gene-silencing, which plays an important role in plant stress tolerance. However, little is known about how Argonaute genes affect the water-use efficiency (WUE) of apple (Malus domestica) or its responses to different abiotic stresses. We identified and characterized MdAGOs in apple and analyzed their chromosome locations, exon/intron structu ...
... Nucleobase ascorbate transporters (NATs), also known as nucleobase:cation-symporter 2 (NCS2) proteins, belong to an evolutionarily widespread family of transport proteins. Because little is known about NAT genes in apple (Malus domestica), this papper screened GDR genome databases and identified 14 NATs in that species. Here, presented an overview of this gene family in apple, including structures ...
Malus domestica; apples; application rate; difenoconazole; electrospray ionization mass spectrometry; half life; humans; maximum residue limits; resistance management; soil; soil sampling; tandem mass spectrometry; ultra-performance liquid chromatography; China
Abstract:
... A new combined difenoconazole and fluxapyroxad fungicide formulation, as an 11.7 % suspension concentrate (SC), has been introduced as part of a resistance management strategy. The dissipation of difenoconazole and fluxapyroxad applied to apples and the residues remaining in the apples were determined. The 11.7 % SC was sprayed onto apple trees and soil in Beijing, Shandong, and Anhui provinces, C ...
... A genetic linkage map of the apple, composed of 175 SSR and 105 SRAP markers, has been constructed using 110 F1 individuals obtained from a cross between the ‘Red Fuji’ Malus domestica and ‘Hongrou’ Malus sieversii cultivars, which have relatively high levels of DNA marker polymorphism and differ remarkably in fruit-related traits. The linkage map comprised 17 linkage groups, covering 1299.67 cM w ...
... Soluble sugars and organic acids have a strong impact on the overall organoleptic quality of fruits. In this study, we report the identification of quantitative trait loci (QTLs) for individual sugars and organic acids in apple. A high density linkage map of apple was constructed using the 1536 EST-derived SNP GoldenGate genotyping platform. The linkage map consists of 601 molecular markers, inclu ...
Malus domestica; Valsa; apples; arid lands; branches; crop production; ecosystems; flowers; fruit crops; nitrogen; orchards; phosphorus; planting; potassium; rain; rootstocks; soil depth; soil water; soil water content; sustainable development; trees; water content; China
Abstract:
... Biennial bearing is a common problem encountered in perennial fruit crops. In order to determine a suitable crop load for sustainable development of dryland apple orchards, we defined the concept of “appropriate productivity” and examined five crop load levels in an apple orchard ecosystem on the Loess Plateau, in Changwu, Shaanxi province, China. The orchards were planted with Fuji apple (Malus d ...
... The infection process of apple twigs by Botryosphaeria dothidea, the causal agent of apple ring rot on fruit and cankers on twigs, was examined by light and electron microscopy. Hyphae of B. dothidea entered the apple twigs at the lenticels, and some hyphae extended intercellularly in the collenchyma of the cortex before entering the parenchymal tissue one month post-inoculation. Then, the fungal ...
Malus domestica; air; air temperature; apples; canopy; field capacity; irrigation; monitoring; rhizosphere; soil water; soil water content; soil water deficit; solar radiation; vapor pressure; water potential; water stress; wind speed
Abstract:
... We studied the suitability of empirical crop water stress index (CWSI) averaged over daylight hours (CWSId) for continuous monitoring of water status in apple trees. The relationships between a midday CWSI (CWSIₘ) and the CWSId and stem water potential (ψ ₛₜₑₘ), and soil water deficit (SWD) were investigated. The treatments were: (1) non-stressed where the soil water was close to field capacity an ...
... Scanning of the leaves of four apple cultivars at weekly intervals during the 2012 growing season made it possible to calculate their surface area. The calculation of the surface area of scanned leaves revealed that the leaf surface area is determined by the multiplication of the leaf width and leaf length, which is then multiplied by the factor 0.71. Measurement of the leaf width and the leaf len ...
Malus domestica; alternate bearing; apples; branches; canopy; color; fruit crops; fruit quality; fruits; hormones; horticulture; markets; orchards; rotors; taste; trees
Abstract:
... Thinning is a pre-requisite for the majority of fruit crops worldwide in order to overcome or prevent alternate bearing (high and low yields in alternating years) and to provide regular yields of high quality fruit in terms of size, taste, color and constituents, as required by the market. Chemical thinning, a widely used practice, usually relies on compounds that are commonly referred to as hormo ...
... Current safety assessment of genetically modified crops requires detailed information about the insertion of the transgene and the effect of its expression on the biochemistry and physiology of the host plant. Whilst the intended effect of the transformation can be verified through phenotypic screening, molecular approaches are required to observe unintended effects. We investigated the molecular ...
... To investigate the expression of a gene encoding an auxin carrier protein in trees of different apple rootstocks, a 1433-bp full-length cDNA fragment of the putative auxin carrier protein gene RF-PIN1, encoding 476 amino acids, was cloned from Fuji apple. Using semi-quantitative RT-PCR analyses, RF-PIN1 transcripts were detected in various organs at different times of the year; the transcript abun ...
Malus domestica; alternate bearing; apples; color; flowering; fruit growing; fruit trees; fruits; image analysis; leaves; ontogeny; orchards; prediction; pruning; small fruits; tree yields; Germany
Abstract:
... Yield estimation in the commercial production of fruit tree species is becoming an increasingly popular research topic. The outcome, however, is subject to both variability from tree to tree, and from year to year (alternate bearing). Hence, the objective of this contribution was to investigate any potential effects of tree crop load on fruit detection for the prediction of tree yields, as used in ...
... In Samochvalovichi, Belarus, apple and pear tree root samples were examined for the presence of phytoplasmas using a universal 16S rDNA-based PCR assay. Out of 27 tested apple trees, 23 were found to be infected by ‘Candidatus Phytoplasma mali’ and 46 out of 58 pear trees were positive for the presence of ‘Ca. P. pyri.’ Species were identified by sequence analysis of the 16S rDNA amplicons. The mo ...
... Antioxidant and antimicrobial biopolymer films were developed by combining apple (Malus domestica Borkh.) peel (AP) and carboxymethylcellulose (CMC) with 1% apple peel extract and (+)‐tartaric acid. Total phenolic and flavonoid contents of AP were found to be 24.94 mg gallic acid and 8.85 mg catechin equivalents/g dried weight, respectively. 1,1‐diphenyl‐2‐picrylhydrazyl/2,2′‐azino‐bis(3‐ethylbenz ...
Luca Bianco; Alessandro Cestaro; Gareth Linsmith; Hélène Muranty; Caroline Denancé; Anthony Théron; Charles Poncet; Diego Micheletti; Emanuela Kerschbamer; Erica A. Di Pierro; Simone Larger; Massimo Pindo; Eric Van de Weg; Alessandro Davassi; François Laurens; Riccardo Velasco; Charles‐Eric Durel; Michela Troggio
Malus domestica; apples; cultivars; fruit crops; genetic variation; genome; genotyping; germplasm; heterozygosity; linkage disequilibrium; single nucleotide polymorphism; surveys; temperate zones
Abstract:
... Cultivated apple (Malus × domestica Borkh.) is one of the most important fruit crops in temperate regions, and has great economic and cultural value. The apple genome is highly heterozygous and has undergone a recent duplication which, combined with a rapid linkage disequilibrium decay, makes it difficult to perform genome‐wide association (GWA) studies. Single nucleotide polymorphism arrays offer ...
... The development of molecular markers linked to specific traits is now routine practice, but the gap between genomics and breeding often delays their application. In the frame of the FP7 European project FruitBreedomics, apple pilot studies were designed to exploit the project’s outcomes towards the practical application of marker-assisted breeding (MAB) programs. The aim of this pilot study was to ...
DNA; Malus domestica; Neonectria ditissima; apples; ascospores; conidia; cultivars; fungi; germplasm conservation; orchards; quantitative polymerase chain reaction; screening; tree diseases; weather; wood; Northern European region
Abstract:
... Fruit tree canker, caused by the fungus Neonectria ditissima, is considered to be a serious economic problem in apple orchards, especially in north-western Europe. This fungus produces conidia and ascospores. They are dispersed and cause infection and eventually life-threatening cankers during prolonged periods of rainy weather. Moreover, spores produced on the infected wood can act as an infectio ...
... Apple has become a model species for Rosaceae genetic and genomic research, but it is difficult to obtain transgenic apple plants. Transgenic lines have been obtained from a number of genotypes, but the efficiency of apple transformation is not high. In the past several years, we developed an efficient regeneration and Agrobacterium-mediated transformation system for apple using cotyledons as expl ...
Malus domestica; alternate bearing; apples; biosynthesis; branches; cultivars; flowering; fruit growing; fruit trees; genes; gibberellins; inflorescences; leaves; models; shoots
Abstract:
... In many perennial fruit trees, flowering in the year following a year with heavy fruit load can be quite limited. This biennial cycle of fruiting, termed alternate bearing, was described 170 years ago in apple (Malus domestica). Apple inflorescences are mainly found on short branches (spurs). Bourse shoots (BS) develop from the leaf axils of the spur. BS apices may terminate ~100 days after flower ...
... Eriosoma lanigerum (Hemiptera: Aphididae) is an important invasive pest causing serious damage to apple trees in many countries. The powdery wax covering the integument of this aphid plays an important role in its defense against natural enemies. We examined all instars and adults of E. lanigerum to determine the morphology and distribution of wax gland pores. We found four lines of wax-gland plat ...
Apple chlorotic leaf spot virus; Apple mosaic virus; Apple stem grooving virus; Apple stem pitting virus; Malus domestica; apples; coat proteins; cultivars; genes; humans; orchards; population structure; reverse transcriptase polymerase chain reaction; trees; viruses; Czech Republic
Abstract:
... Samples from apple trees in old commercial and abandoned orchards as well as in wild apple trees in the outskirts of Prague in the Czech Republic were surveyed for the presence of Apple mosaic virus (ApMV), Apple stem grooving virus (ASGV), Apple stem pitting virus (ASPV) and Apple chlorotic leaf spot virus (ACLSV) using conventional and quantitative RT-PCR. Results revealed that ACLSV was the mos ...
Malus domestica; Pyrus communis; apples; chemical composition; cultivars; flowers; foraging; fruit crops; fruit set; insect pollination; nectar; orchards; pears; phytosterols; planting; pollen; pollinating insects; polypeptides; spring; sugars; trees; Belgium
Abstract:
... Pear and apple are among the main fruit crops worldwide. These species can be planted in mixed orchards, and they both depend on insect pollination for fruit set. As pollinating insects are attracted by the floral resources, we investigated nectar and pollen production and chemical composition in four pear (‘Concorde’, ‘Conférence’, ‘Doyenné du Comice’, ‘Triomphe de Vienne’) and five apple (‘Braeb ...
... Biennial cropping is typically characterized as having ‘ON’ and ‘OFF’ years in which the ‘ON’ year produces an excessive crop load and the ‘OFF’ year has a very small crop load. Frost damage during the bloom period or winter freeze damage is another means of reducing the crop load that can initiate biennial bearing in an otherwise consistent cropping system. The objectives were to determine what e ...
Malus domestica; apples; color; cotton; cotton fabric; dyeing; leaves; scanning electron microscopes; scanning electron microscopy; washing; wool; woolen fabric
Abstract:
... In this study, apple leaves were used to dye wool and cotton fabrics. Effects of mordant type and dyeing technique on color yield and fastness properties were investigated. The selected dyed fibre sample surfaces were observed using a scanning electron microscope (SEM). Color strength (K/S) values of the dyed fabrics were between 0.53 and 20.56. Washing and rubbing fastness results of the dyed fab ...
... DNA‐based protocols are the standard methods for the diagnosis of infected plant material. Nevertheless, these methods are time‐consuming and require trained personnel, with an efficacy depending on the sampling procedure. In comparison, recognition methods based on volatile compounds emissions are less precise, but allow a non‐destructive mass screening of bulk samples, and may be implemented to ...
Malus domestica; apples; chlorophyll; cultivars; flowering; fluorescence; fruit growing; orchards; photosystem II; semiarid zones; sunburn; temperature; water stress
Abstract:
... Sun-injury (=sunburn) on apples is an important physiological disorder affecting all cultivars grown in semi-arid climates. Both, high light and elevated temperatures during the fruit-growing season are responsible for the symptoms. Therefore, a crop water stress index (CWSI), calculated from infrared images, and chlorophyll fluorescence were assessed as early predictors, when no symptoms of sun-d ...
Malus domestica; apples; branches; cultivars; feathers; fertigation; nitrogen; rootstocks; trees
Abstract:
... The apple (Malus × domestica Borkh.) cultivar ‘Golden Reinders’ was used to study the effects of mixture of 6-BA and GA(4+7) (Promalin) and nitrogen fertigation to improve branching of nine-month-old nursery trees grafted on ‘M9’ rootstock. Promalin was applied three times in June in weekly intervals, in concentrations of 0, 500, 1000, 1500 and 2000 mg L-1 to the upper third of trees. Nitrogen (N) ...
... This study investigated silicon (Si) fertilizer application in an apple orchard; Si fertilizers were applied at rates of 50 and 100 g/tree, with humic acid and citric acid, respectively. The results showed that Si accumulation in apple tree was influenced by the type and amount of fertilizer, and was higher in organic Si treatment. Si content in leaves, peel, flesh and whole fruit significantly in ...
... The amount and composition of phytohormones, sugars, and some other leaf characteristics depending on a crop load were evaluated in apple (Malus domestica Borkh. cv. Ligol grafted on P 60 rootstock) trees in order to prevent biennial bearing. The crop load was adjusted to 12 (control, unthinned), 8, 4, and 0 (non-fruiting) inflorescences (or fruits) per cm² of trunk cross-sectional area (TCSA). In ...
... Leaf analysis is used as a standard method for determination of the nutritional status of apple orchards in the middle of vegetation, but not take into consideration the differences among cultivars in the evaluation of results of leaf analysis. In 2010-2011 years, this study was performed on leaves collected from two different regions in Isparta, Turkey where apple is cultivated for determining th ...
... Micro-irrigation scheduling and mulch application can be used by orchardists to match water supply to plant demand and conserve water. There is little information on how these management practices affect nitrous oxide (N2O) emissions from orchard soils, and most previous studies were short-term (<3 months during the growing season). We investigated (1) N2O emissions across a 2year cycle of orchard ...
... To investigate the mechanism by which 6-BA promotes flower bud formation, ‘Fuji’ apple trees were sprayed with 300 mg L⁻¹ 6-BA before the onset of floral induction. The differential transcription responses of flowering genes (MdFT, AFL1 and MdTFL1) and key cytokinin biosynthesis genes (MdIPT5a and MdIPT3a) in terminal buds were studied during flower development by real-time quantitative PCR. In ad ...
... Gibberellins (GAs) reduce apple (Malus domestica) flowering rates; however, the mechanism of their action is not fully understood. To gain a better insight into gibberellin-regulated flowering, here, 5 year-old ‘Fuji’ apple trees were used to explore the responses of hormones [GA1+3, GA4+7, indole-3-acetic acid (IAA), zeatin-riboside (ZR), and abscisic acid (ABA)], and gibberellin- and flowering-a ...
... This research paper presents the results of a field trial performed in a young orchard with apple cultivar 'Gala Galaxy', on the rootstock 'M9'. In November 2012, nursery “knip” trees were planted at the distance 3×1 m. In the first growing season (2013) the experimental plot was separated in a randomized block system of four treatments. Eight apple trees (2 for each variant), in the stage of nurs ...
... Calcined kaolin-based particle films (PKPF) are effective in reducing insect, heat, photosynthetically active radiation (PAR) and ultraviolet radiation (UV) stress in plants due to the reflective nature of the heat-treated particles. The purpose of this study was to determine the effects of PKFP treatments applied at moderate (3%) and high rates (12% w/v) on apple physiology, yield and quality and ...
Malus domestica; apples; application rate; biomass; carbon; evapotranspiration; fruit yield; gas exchange; horticultural crops; insects; kaolin; leaves; lysimeters; mechanism of action; particle films; stomatal conductance; temperature; trees; vapor pressure; water use efficiency
Abstract:
... Processed calcined kaolin particle films (PKPF) have been shown to repel some insects and reduce various environmental stresses often resulting in improved yield and quality of horticultural crops. PKPF studies in the literature have various water use efficiency (WUE) responses. The purpose of this study was to evaluate 2 application rates of PKPF (3% and 12%) on the whole tree water use efficienc ...
Malus domestica; cultivars; evapotranspiration; field capacity; fruit quality; iodine; irrigation scheduling; irrigation water; statistical analysis; trees; vegetative growth; water use efficiency
Abstract:
... This study was conducted in 2007 and 2008 in order to determine the effects of irrigation frequency on the yield and quality parameters of dwarf trees of the apple cultivar ‘Gala, Galaxy’ in the first and second year of cultivation. Irrigation water was applied at 3‑, 5‑, 7‑, and 10-day intervals as much as the amount of water consumed from the field capacity. Statistical analysis revealed that th ...
... Natural variability in flowering and fruit set of commercial apple trees (Malus x domestica Borkh.) must be effectively managed to achieve optimised yield and quality. Early removal of excess flowers and fruit improves fruit size and quality. However, physiological responses to environment and flowering intensity, and their interaction with chemical thinning are not well understood, causing unpred ...
... When establishing an apple orchard it is important to stimulate the growth of young trees to fill up their allotted space in the row and minimize the time to come into full production with high quality fruit. In May 2012 two-year-old 'Summerred'/'M.9' knip trees were planted at the experimental farm at NIBIO Ullensvang, western Norway. The planting distance was 4×1 m (2500 trees ha-1). Three ferti ...
Malus domestica; antioxidant activity; apples; cultivars; dried fruit; fruit quality; heat; microwave drying; microwave treatment; ovens; quality control; raw fruit
Abstract:
... Fresh fruits can be preserved for later consumption using methods such as drying. However, fruit quality can significantly decline during processing. This study investigates the effects of microwave and oven processing on the preserved quality of dried apple. Heating experiments were performed at two different microwave output powers of 180 and 540 W. Moisture contents of ‘Starking’ and ‘Pink Lady ...
Malus domestica; air; anthocyanins; apples; bags; caffeic acid; chlorogenic acid; color; epicatechin; ferulic acid; fruit peels; fruit quality; fruits; humidity; solar radiation; syringic acid; temperature
Abstract:
... To investigate the effects of relative air humidity (AH) on ‘Fuji’ apple (Malus domestica Borkh.) peel phenolic compounds and pigment coloration, the bagged fruits were bags moved and then exposed to high AH and low AH conditions, respectively. Cyanidin-3-galactoside, the main anthocyanin compound in apple, and 17 other types of phenolic compounds were detected and their concentrations were also c ...
... Sunburn causes some damage to apple orchards and it results from heat stress to the fruit leading to injury of the affected cells. A net shield is a good option for protection of apple trees against damage by hail, strong wind, and birds. Also, it reduces sunburn and russeting of fruits, provides better color and skin uniformity. This study was carried out to determine the effects of two different ...
... BACKGROUND: There is growing demand to replace chemical pesticides with alternatives owing to concerns related to impacts on human health and the environment. Plant‐derived plant protection products could provide sustainable and environmentally friendly alternatives to chemical products. The aim of this study was to identify plant and fungal extracts with so far unknown activity against important ...
... To reduce reliance on airblast sprayers in sweet cherry (Prunus avium L.) and apple orchards (Malus domestica Borkh.), a solid set canopy delivery system (SSCDS) using multiple levels of sprinkler nozzles for trellised canopies is being developed. This study reports preliminary comparisons of application efficacy using common plant growth regulators (PGR). The bloom thinner ammoniumthiosulfate (2% ...
... Trials on mechanical thinning were firstly carried out in Poland starting in 2008 and, thereafter, continued in 2009 and 2010 on 'Gala Must', 'Jonagored' and 'Pinova', apple trees grafted on M.9 rootstocks. Ten different treatments were established on each cultivar: four of them were mechanically thinned setting the Baum device at two tractor speeds (5 or 7.5 km h-1) and two rotors speed (360-380 ...
... Conotrachelus nenuphar (Herbst) (Coleoptera: Curculionidae), plum curculio, is a serious direct pest of North American tree fruit including, apples, cherries, peaches and plums. Historically, organophosphate insecticides were used for control, but this tool is no longer registered for use in tree fruit. In addition, few organically approved insecticides are available for organic pest control and n ...
... This study investigated the volatile emission from apple (Malus x domestica Borkh., cv. Golden Delicious) foliage that was either intact, mechanically-damaged, or exposed to larval feeding by Pandemis heparana (Denis and Schiffermüller) (Lepidoptera: Tortricidae). Volatiles were collected by closed-loop-stripping-analysis and characterized by gas chromatography-mass spectrometry in three time peri ...
... Halyomorpha halys (Stål), the brown marmorated stink bug, is an invasive, polyphagous insect that causes serious economic injury in particular to specialty crops in the United States. Growers have been forced to respond by increasing the frequency of broad-spectrum insecticide (e.g., neonicotinoid, pyrethroid, and carbamate) applications. One strategy to reduce reliance on insecticides is known as ...
... Regular monitoring and assessment of crops is one of the keys to optimal crop production. This research presents the development of a monitoring system called the Crop Monitoring and Assessment Platform (C-MAP). The C-MAP is composed of an image acquisition unit which is an off-the-shelf unmanned aerial vehicle (UAV) equipped with a multispectral camera (near-infrared, green, blue), and an image p ...
... A bHLH transcription factor that is induced by low temperature was found in apple (Malus × domestica Borkh.). To understand the sequence characteristics of the gene, bioinformatics analysis was performed. Furthermore, gene expression patterns of the laminated apple seeds and lateral flower buds were analyzed during the period of dormancy release with semi-quantitative RT-PCR. Based on secondary st ...
... Anthocyanins are secondary metabolites in higher plants that contribute to the colors of flowers and fruits. MYB, bHLH, and UFGT genes are key genes in fruit anthocyanin synthesis. We identified two MYB1 genes, two bHLH3 genes, three bHLH33 genes, and four UFGT genes in the apple (Malus domestica Borkh.) genome and analyzed the expression of these genes in apple skin at the fruitlet stage and ripe ...
Sunny George Gwanpua; Ifigeneia Mellidou; Jelena Boeckx; Clare Kyomugasho; Niels Bessemans; Bert E. Verlinden; Maarten L.A.T.M. Hertog; Marc Hendrickx; Bart M. Nicolai; Annemie H. Geeraerd
... The property of apple fruit (Malus×domestica Borkh.) of being able to retain their postharvest firmness to some extent, is an important aspect in many breeding programs. A clear identification of genes responsible for softening is therefore imperative. Polygalacturonase1 has been identified in the literature as the main gene that regulates softening in fruits, including apple. The aim of this work ...
... The control of scion vigor by dwarfing apple rootstocks is most convincingly elucidated by the shoot–root–shoot signaling of auxins and other hormones. To identify auxin and auxin-related genes that may play roles in the composite tree’s auxin metabolism and dwarfing mechanism, the concentrations of IAA and the expression level of key auxin synthesis, transport, and metabolism genes were measured ...
... Two pesticide risk indicators, Pesticide Impact Rating Index (PIRI) and Environmental Potential Risk Indicator for Pesticides (EPRIP), were used to determine the likelihood of off-site transport to surface water of pesticides used in a cherry (Prunus avium cultivars) and an apple (Malus domestica cultivars) orchard. The predictions of off-site transport of some of the pesticides were verified agai ...
... A series of experiments in Virginia, USA apple orchards evaluated the temporal effects of natural enemies on Eriosoma lanigerum (Hausmann) (Hemiptera: Aphididae) colonies on potted and mature apple trees. Exclusion cage studies using potted trees resulted in increasing colony numbers on fully caged trees and declining colony numbers or colony extinction on trees exposed to natural enemies. Closer ...
... The Mediterranean fruit fly, Ceratitis capitata (Wiedemann) (Diptera: Tephritidae), is a key pest of fruit trees in Syria and is attacked by the larval-pupal parasitoid, Aganaspis daci (Weld) (Hymenoptera: Figitidae). The seasonal population dynamics and distribution of A. daci were studied in surveys of orchards [ Citrus reticulatum (clementine), Citrus sinensis (maourdi blood orange), Citrus par ...
... Numerous agronomical applications of remote sensing have been proposed in recent years, including water stress assessment at field by thermal imagery. The miniaturization of thermal cameras allows carrying them onboard the unmanned aerial vehicles (UAVs), but these systems have no temperature control and, consequently, drifts during data acquisition have to be carefully corrected. This manuscript ...
... Flavonols, the main flavonoids in plant leaves, have newly been proposed as a H2O2 scavenger in guard cells. However, whether 5-aminolevulinic acid (5-ALA) is involved in regulating stomatal movement of apple (Malus × domestica Borkh. ‘Fuji’) leaves through flavonol accumulation remains unclear. In this study, using diphenylboric acid 2-amino ethyl ester (DPBA, a flavonol fluorescent dye) and a la ...
... BACKGROUND: The effects of foliar applications of microdoses of sucrose to reduce the damage by the codling moth have been reported from nine trials carried in France and Algeria from 2009 to 2014. The activity of sucrose alone was assessed by comparison with an untreated control and some treatments with the Cydia pomonella granulovirus or a chemical insecticide. The addition of sucrose to these d ...
... Flower buds are the most vulnerable parts of the dormant apple trees to frost injury. Especially during fall and spring when the processes associated with the transitional periods of hardening and de-hardening occur, tissues are more active and thus less cold hardy. The critical temperatures affecting the flower bud and the associated damage are variable and unknown for most of the current apple c ...
Malus domestica; apples; breeding; cultivars; fruit quality; genetic variation; markets; sensory evaluation; sensory properties; Mediterranean region
Abstract:
... Today, ancient cultivars have been considered obsolete and replaced, leading to a dramatic loss of genetic diversity. In this trial we examined the quality of the six ancient apple cultivars: Bommino, Gelato, Miliadeci, Rotolari, Turco, and Virchiata. Fruit was submitted to the determination of physicochemical traits and a sensory profile was defined by a trained panel using 20 attributes. We also ...
... The first rate-limiting enzyme of the mevalonate pathway during isoprenoid biosynthesis is 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR). In this study, the expression pattern of the MdHMGR2 gene in Malus domestica suggests that MdHMGR2 was expressed in a tissue-specific manner and was significantly induced by ethephon (ETH), indoleacetic acid (IAA), methyl jasmonate (MeJA), and salicylic acid ( ...
... SUMOylation, the conjugation of target proteins with SUMO (small ubiquitin-related modifier), is a type of post-translational modification in eukaryotes and involves the sequential action of activation (E1), conjugation (E2) and ligation (E3) enzymes. In Arabidopsis, the AtSIZ1 protein is a SUMO E3 ligase that promotes the conjugation of SUMO proteins to target substrates. Here, we isolated and id ...
... The soilborne fungus Rosellinia necatrix is the causal agent of white root rot disease on numerous plant species, including apple, which, together with the ability to survive in soil for long periods, makes this pathogen difficult to control. To understand the origins of pathogen infestation, a survey of diseased apple orchards in the northeast of Italy was conducted and 35 isolates of R. necatrix ...
... Accurate prediction of genetic potential and response to selection in breeding requires knowledge of genetic parameters for important selection traits. Data from breeding trials can be used to obtain estimates of these parameters so that predictions are directly relevant to the improvement program. Here, a factor allocation diagram was developed to describe the sampling design used to assess the q ...
Malus domestica; analysis of variance; apples; correspondence analysis; cultivars; diploidy; gene pool; genetic techniques and protocols; genetic variation; genotype; germplasm; germplasm conservation; homonym; hybridization; landraces; microsatellite repeats; triploidy; Portugal
Abstract:
... A set of 87 apple accessions, located in three Portuguese apple germplasm collections, plus eight reference cultivars, were analyzed using 16 SSRs with the aim of assessing their genetic diversity and structure and evaluating relationships among them. Among the accessions studied, 64 unique genotypes were identified, 51 diploids and 13 putative triploids, revealing 19 groups of synonyms and 4 of h ...
... Apple Glomerella leaf spot (GLS) is a destructive fungal disease that damages apple leaves during the summer in China. Breeding new disease-resistant varieties is considered to be the best way of controlling GLS. A genetic study of resistance to Glomerella leaf spot (GLS) in apple was conducted by using four F1 hybrid groups (‘Fuji’ × ‘Golden Delicious’, ‘Golden Delicious’ × ‘Fuji’, ‘Gala’ × ‘Fuji ...