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... Volatile compounds produced by Delicious apple fruit during the 8-week transition period from pre- to postclimacteric were identified using headspace sampling of intact fruit and GC-MS. As apple development progressed, concentrations of butanal, pentanal, (E)-2-hexenal, and heptanal declined. Concentrations of most alcohols were variable throughout the same period, but 2-methyl-1-butanol was prese ...
... In previous studies, we have shown that apple and hawthorn populations of Rhagoletis pomonella (Diptera: Tephritidae) represent partially reproductively isolated and genetically differentiated host races; a result consistent with predictions of sympatric speciation models. The geographic pattern of allozyme variation for these flies is complex, however, as inter-host differences are superimposed o ...
... Enemy—free space is a potentially important factor affecting host plant use by phytophagous insects. In particular, escape from parasitoids, predators and competitors could mediate a successful host shift by compensating for decreased feeding performance on a new plant. Here I investigate the effects that two braconid wasp parasitoids (Opius lectus and Biosteres melleus) have on sympatric host rac ...
Malus domestica; cultivars; field experimentation; orchards; apples; harvesting; cold storage; nitrogen content; calcium; mineral content; firmness; diameter; titratable acidity; apple juice; brix; soil fertility; nitrogen; leaves; fruiting; nutrition-genotype interaction; seasonal variation; crop quality; chemical constituents of plants; Finland
Abstract:
... During 1994-1995, field experiments were conducted in six apple orchards located in the southwest of Finland (the mainland and the Aland Islands). The cultivars were 'Melba', 'Raike', 'Red Atlas', 'Lobo', 'Aroma', and 'Akero'. Fruit samples were picked at about one week before commercial maturity and stored for three to six months at 2 to 4 degrees C and 85-95% relative humidity. During storage th ...
... An αâamylase gene product was isolated from apple fruit by reverseâtranscriptase PCR using redundant primers, followed by 5â² and 3â² RACE. The gene is a member of a small gene family. It encodes a putative 46.9âkDa protein that is most similar to an αâamylase gene from potato (GenBank accession M79328). In apple fruit this new gene was expressed at low levels, as detected by reverseâ ...
apples; biotechnology; deficit irrigation; fruit size; fruit weight; fruiting; fruits; horticulture; photosynthesis; turgor; water potential
Abstract:
... Interactions were investigated between irrigation and crop load on photosynthesis, fruit growth and size, and fruit water relations of ‘Braeburn’ apple. The irrigation treatments were a commercially irrigated control (CI) and deficit irrigation (DI) applied throughout the season. The crop load treatments were commercial crop load (CCL) having six fruit per cm² of trunk cross-sectional area and lig ...
apples; biotechnology; color; fruit size; fruiting; fruits; harvest date; horticulture; models; standard deviation; New Zealand
Abstract:
... The size distribution of fruit on an apple tree on any potential harvest date can be estimated by measuring a sample of fruit early in the season and projecting forward in time using standard growth curves. However, ‘Royal Gala‘ apples grown in New Zealand are picked in multiple harvests spread over about three weeks, so the overall size distribution of harvested fruit can differ significantly fro ...
Panonychus ulmi; apples; carbon; crops; dry matter accumulation; fruiting; integrated pest management; leaves; mites; models; pests; tree growth; trees
Abstract:
... A basic tenet of integrated pest management (IPM) is that many crop plants can tolerate some threshold level of leaf injury from foliar pests before the crop is affected. In practice, foliar pests are monitored, and pesticides are used only when pests reach a density that is thought to cause too much damage. Sound monitoring methods for many pests have been developed, but our understanding of plan ...
anthocyanins; harvesting; canopy; apples; fruits; total soluble solids; fruit quality; trees; color; Syzygium; fruiting; shoots
Abstract:
... Twenty-one-year-old 'Pink' wax apple (Syzygium samarangene, Merr. et Perry) trees with bald cut cultivation system were used for this study. Fruits and fruiting shoots were harvested at commercial maturity in late December. Fruit position on the tree had a marked influence on fruit quality of the wax apple. Fruit on the lower trunk had the heaviest weight and largest volume of fruit tested from 9 ...
... Using a fruit disc method penetration of 45CaCl2 across apple fruit surfaces (Malus x domestica cv. Golden Delicious) was studied during fruit development in 1999. The donor solutions contained 5 g L-1 CaCl2 and 0.2 g L-1 Glucopon 215 CSUP as wetter. A small droplet (5 µl) was applied to each fruit disc and allowed to dry within 1 h. Penetration was followed from the hydrated salt residue on the f ...
... In 1996 and 1998 sprays containing 1 ml L-1 of ‘Zintrac’ (70% w/v Zn) or 10 ml L-1 of ‘Stopit’ (16% w/v Ca) were applied at 500 L ha-1 to apple tree of cv Cox Orange Pippin trees during the cell division or cell expansion phase of fruit development. In 1996, early and late Zn sprays increased Zn concentration in the cortical tissue by 61 and 50 µg 100 g-1 fresh weight respectively. Late Ca sprays ...
... Abscisic acid (ABA) improves the sink strength by promoting the phloem unloading and regulating the assimilate metabolism in the economic sink organs of crops, although its mechanism remains unknown. The present experiment, using the techniques of the in vivo injection of ABA into the intact apple fruit attached to a growing apple tree and the in vivo incubation of the fruit tissue in the ABA-cont ...
turgor; shelf life; apples; fruits; total soluble solids; water potential; fruit maturity; starch; fruit quality; firmness; color; fruit trees; fruiting; nondestructive methods; Northern European region
Abstract:
... To fulfil the demand for quality fruit around the year, apples are stored. The shelf life of the fruit depends on the status of the apples at the point of harvest. For measuring the quality of apples the starch degradation, the soluble solids content and the Magness-Taylor- (MT ) firmness test are commonly used in Northern Europe. Favourable tools to determine the status of fruit on the tree are n ...
... Wax apple (Syzygium samarangense Merr. & Perry) fruit skin discs from different fruit development stages incubated with and without sucrose showed differential effects on diameter, weight, soluble solids (SSs) and skin color. Diameter, weight and chlorophyll content declined, while SSs and anthocyanin concentrations increased in a sucrose medium. Both SS and anthocyanin concentrations in the sucro ...
... Ethylene scrubbing of Cox stores reduces fruit softening when used in combination with treatments that reduce ethylene production such as orchard sprays of daminozide or pre-storage treatment with high CO2. However, such treatments are injurious to the fruit when stored for long periods. Experiments were carried out to determine the effects of sprays containing AVG (aminoethoxyvinylglycine) on the ...
... Ethylene scrubbing of stores containing ‘Cox's Orange Pippin’ (‘Cox’) apples reduces fruit softening when used in combination with treatments that reduce ethylene production such as orchard sprays with daminozide or pre-storage treatment with high CO2. However, such treatments are injurious to the fruit when stored for long periods. Two experiments were conducted to determine the effects of sprays ...
Erwinia amylovora; apples; breeding; clones; disease resistance; fruiting; greenhouses; host-pathogen relationships; rootstocks; shoots; tree mortality; trees
Abstract:
... When vigorously growing shoots of 49 different apple rootstocks grown in a greenhouse were inoculated with different strains of Erwinia amylovora, Budagovsky 9 (B.9), Ottawa 3, Malling 9, and Malling 26 were the most fire blight susceptible rootstocks and Geneva 11, Geneva 65, Geneva 16, Geneva 30, Pillnitzer Au51-11, Malling 7, and several breeding selections were the most resistant. Significant ...
... Background and Aims: The xylem in fruit of a number of species becomes dysfunctional as the fruit develops, resulting in a reduction of xylem inflow to the fruit. Such a reduction may have consequential effects on the mineral balance of the fruit. The aim of this study was to elucidate the dynamics and nature of xylem failure in developing apples (Malus domestica) showing differing susceptibilitie ...
apples; H-transporting ATPase; monosaccharides; transporters; Malus domestica; sieve elements; phloem companion cells; fruit crops; plasma membrane; fruit trees; fruiting
Abstract:
... The phloem unloading pathway remains unclear in fleshy fruits accumulating a high level of soluble sugars. A structural investigation in apple fruit (Malus domestica Borkh. cv Golden Delicious) showed that the sieve element-companion cell complex of the sepal bundles feeding the fruit flesh is symplasmically isolated over fruit development. 14C-autoradiography indicated that the phloem of the sepa ...
... Shade and chemical thinning treatments were applied to mature ‘Royal Gala’/M.26 apple trees either alone or in combination to study their effects on the pattern of abscission and growth of spur fruit. Natural fruit drop occurred in two distinct waves in both years; the first wave peaked 20 d after bloom (DAB) at a weekly abscission rate of c 15% in both years. The second wave of fruit drop in 2001 ...
apples; clones; cultivars; dwarfing; field experimentation; fruiting; rootstocks; trees; vigor
Abstract:
... The influence of subclones of M.9 and P 22 and new Polish rootstocks P 59, P 60, P 61 and P 62 on growth and fruiting was studied in a field experiment during 7 years. Rootstocks were grafted with Jonagold and Ligol cultivars. Tree vigour on M.9 subclones was very close to that on standard M.9 EMLA. Trees grafted on the Polish rootstock P 62 were much weaker than those on M.9 EMLA. Tree vigour on ...
... Growth and maturation of the edible cortical cells of apples (Malus domestica Borkh) are accompanied by a selective loss of pectin-associated (1 leads to 4)-beta-D-galactan from the cell walls, whereas a selective loss of highly branched (1 leads to 5)-alpha-L-arabinans occurs after ripening and in advance of the loss of firm texture. The selective loss of highly branched arabinans occurs during t ...
... Monitoring of apple fruit development on the tree is necessary for determination of optimum harvest date. The current method is to pick several times during fruit development fruit samples and to analyse them in a destructive way. Sufficient experience is necessary to correctly interpret the results of analyses. Appreciable errors can occur, if an apple cultivar shows high variability in fruit mat ...
... Polyphenols are functional components in apples and can be separated into four groups by Sephadex LH-20 as epicatechin, procyanidolic oligomers, chlorogenic acid and procyanidolic polymers. Antioxidant activities of each group were determined by FRAP and DPPH radical scavenging assay. It was found that procyanidolic oligomers and procyanidolic polymers influenced the total polyphenols content (mea ...
apples; biotechnology; canopy; carbon dioxide; flowering; fruiting; fruits; gas exchange; horticulture; leaf area; leaf conductance; leaves; rootstocks; solar radiation; spring; vegetative growth; water potential
Abstract:
... The influence of defruiting on vegetative development and its implications for the time response of canopy net CO₂ exchange rate (NCERcanopy), transpiration (Tcanopy) and midday stem water potential (ₛₜₑₘ) were analysed during the last 4 months of apple fruit development. Two crop-load treatments were applied 2 months after full bloom: defruited (DF) and fruited (F). The latter did not receive any ...
... Advanced studies of apple (Malus domestica Borkh) development, physiology, and biochemistry have been hampered by the lack of appropriate genomics tools. One exception is the recent acquisition of extensive expressed sequence tag (EST) data. The entire available EST dataset for apple resulted from the efforts of at least 20 contributors and was derived from more than 70 cDNA libraries representing ...
... Apples (Malus domestica Borkh.) of two table and two cider cultivars were collected during fruit growth and maturation from the end of cell proliferation. Concentrations of flavonoids (flavan-3-ols, dihydrochalcones and flavonols) in the fruit flesh decreased sharply between circa 35 and circa 100 days after flowering. For hydroxycinnamic acids, the decrease appeared slower. In a second experiment ...
application timing; calcium nitrate; apples; bitter pit; calcium fertilizers; postharvest diseases; calcium; foliar application; cell division; plant cultural practices; Malus domestica; fruiting; disease incidence; South Africa
Abstract:
... Pre-harvest foliar applications to increase fruit calcium (Ca) content and reduce bitter pit incidence, is a standard practice world wide. We re-evaluated the effectiveness of early season applications versus late applications of calcium nitrate (Ca(NO3)2) to reduce bitter pit in 'Golden Delicious,' under the present environmental conditions of the Western Cape, South Africa. Two periods of effici ...
... The influence of internal and external factors such as tree fruit load and elevation on ethylene biosynthesis and action was assessed during apple fruit development and ripening. Ethylene biosynthesis, as well as transcript accumulation of the hormone biosynthetic enzymes (MdACS1 and MdACO1), receptors (MdETR1 and MdERS1) and an element of the transduction pathway (MdCTR1), were evaluated in apple ...
... Variation in the overwintering pupal diapause of Rhagoletis pomonella appears to adapt sympatric populations of the fly to seasonal differences in the fruiting times of their host plants, generating ecological reproductive isolation. Here, we investigate what aspects of diapause development are differentially affected (1) by comparing the propensities of apple vs. hawthorn-infesting host races of ...
... To evaluate gene expressions mostly engaged in early development of apple fruit, we performed the identification of transcripts differentially expressed in young fruit by using microarrays spotted with 6,253 cDNAs collected from young and mature apple fruits of the cultivar Fuji (Malus domestica Borkh. cv. Fuji). A total of 3,484 cDNAs out of 6,253 were selected after quality control of microarray ...
enzyme activity; cell walls; fruit quality; firmness; fruiting; enzymes; apples; cell wall components; expansins; fruit composition; pectins; postharvest physiology; esterification
Abstract:
... Fruit softening is thought to result from extensive cell wall modifications that occur during ripening. These modifications are the result, at least in part, of the activity of members of cell wall-modifying enzymes from the same families involved in the cell wall loosening which promote tissue extension and growth. In this work, the activities of a set of pectolytic and non-pectolytic cell wall-m ...
... Anthocyanin concentration is an important determinant of the colour of many fruits. In apple (Malus x domestica), centuries of breeding have produced numerous varieties in which levels of anthocyanin pigment vary widely and change in response to environmental and developmental stimuli. The apple fruit cortex is usually colourless, although germplasm does exist where the cortex is highly pigmented ...
... Ethylene is important in the ripening of apple fruit and different cultivars of apple show very different ripening patterns. The patterns of expression of the currently known genes for ethylene synthesis and perception in apple were examined for the summer apple, 'Sunrise' (SR), and the later season 'Golden Delicious' (GD). Comparisons were made during the last 4 weeks of maturation on the tree an ...
... Sorbitol, the primary photosynthate and translocated carbohydrate in apple (Malusxdomestica Borkh.), is converted to fructose by sorbitol dehydrogenase (SDH; EC 1.1.1.14) which is active in apple fruit throughout development. In the apple genome, nine SDH genes have been isolated and their sequences characterized, but their individual expression patterns during apple fruit set and development have ...
... Alternaria alternata, is the predominant fungal pathogen responsible for moldy-core in apple cultivars of the Red Delicious group. Here we report on the association between virulence of natural isolates of A. alternata, their production of endo-1,4-β-glucanase (EG) and moldy-core development in apple fruits. Based on decay development following wound inoculations of mature fruits, three of 150 iso ...
... Emission of aroma volatile compounds (AVCs) and the activity of some related enzymes were monitored during on-tree maturation of ‘Mondial Gala’ apples. Volatile esters were quantitatively prominent among the AVCs identified throughout the experiment and, in most cases, their production increased noticeably during the later stages of fruit development. However, the activity of alcohol o-acyltransfe ...
Malus domestica; apples; branching; climatic factors; fruiting; genotype; linear models; ontogeny; planting; progeny; quantitative trait loci; trees
Abstract:
... • The present study aimed to dissect tree architectural plasticity into genetic, ontogenetic and environmental effects over the first 4 yr of growth of an apple (Malus × domestica) F1 progeny by means of mixed linear modelling of repeated data. • Traits related to both growth and branching processes were annually assessed on different axes of the trees planted in a staggered‐start design. Both spa ...
... The objective of this study was to determine ascorbic acid (AsA) distribution, biosynthesis and recycling in different tissues of young and mature fruit of cv. Gala apple (Malus domestica Borkh). Our results showed that the peel of 'Gala' apple had the highest AsA levels among all the tissue types, which resulted from a combination of, lower ascorbate peroxidase (APX, EC 1.11.1.11) activity consum ...
... Microribonucleic acids (miRNAs) are small, non-coding RNAs that play important regulatory roles by down-regulating target transcripts in a sequence-specific manner. The miRBase Registry (Release 8.2) lists 732 miRNAs from flowering plant species, with the majority identified from Arabidopsis, rice and poplar where genome sequence is available. In the absence of genomic sequence and on the basis th ...
... Lenticel breakdown disorder (LB), most prevalent on 'Gala' (Malus x domestica) apples, especially in arid regions, has also been observed on other common cultivars. Depending on the preharvest environment, fruit maturity, and length of storage, LB usually appears as one or more round, darkened pits, centered on a lenticel, ranging in diameter from 1 to 8 mm. Symptoms are not visible at harvest nor ...
... Developmental changes of photochemical and non-photochemical processes and the antioxidant system in the shaded peel vs the sun-exposed peel of 'Gala' apple and their responses to sudden exposure of high light were determined to understand the susceptibility of the shaded peel to high light damage with fruit development. As fruit developed, actual PSII efficiency of the shaded peel decreased, wher ...
... Two 1-aminocyclopropane-1-carboxylic acid (ACC) oxidase (ACO) genes have been cloned from RNA isolated from leaf tissue of apple (Malus domestica cv. Royal Gala). The genes, designated MD-ACO2 (with an ORF of 990 bp) and MD-ACO3 (966 bp) have been compared with a previously cloned gene of apple, MD-ACO1 (with an ORF of 942 bp). MD-ACO1 and MD-ACO2 share a close nucleotide sequence identity of 93.9 ...
... Apple, the most common fruit in European and North American diets, can cause allergic reactions in susceptible individuals, and genes for four families of apple allergens have been identified to date: Mal d 1, Mal d 2, Mal d 3, and Mal d 4. Our remit was to evaluate the effects of genotype, tissue, and stage of fruit development on the expression of these allergen genes and, hence, on the potentia ...
... In this study, it is shown that anti-sense suppression of Malus domestica 1-AMINO-CYCLOPROPANE-CARBOXYLASE OXIDASE (MdACO1) resulted in fruit with an ethylene production sufficiently low to be able to assess ripening in the absence of ethylene. Exposure of these fruit to different concentrations of exogenous ethylene showed that flesh softening, volatile biosynthesis, and starch degradation, had d ...
... This project examines the effects of climate change on pome fruit phenology at Klein-Altendorf in the Rhineland fruit-growing region in the West of Germany, using 50 years of weather data and phenology records, including beginning of flowering (F1), full bloom (F2), harvest date and leaf drop of apple and pear, with the following results: 1. Fifty years of weather records and pome phenology data s ...
... The attractiveness of peach (Prunus persica L. Batsch) and apple (Malus domestica L. Borkh.) (both Rosaceae) tissue to gravid female oriental fruit moth, Grapholita (= Cydia) molesta (Busck) (Lepidoptera: Tortricidae), was assessed at three distinct stages throughout the growing season using a dual-choice bioassay. Plant material offered to the female moths consisted of a plant shoot in early spri ...
Pyrus communis; Halyomorpha halys; apples; peaches; crop damage; pears; seasonal variation; Prunus persica; population density; fruit drop; Malus domestica; fruiting; New Jersey; Pennsylvania
Abstract:
... Halyomorpha halys is an introduced stink bug species from Asia that is spreading throughout the Mid-Atlantic United States. It is native to South Korea, Japan, and eastern China, where it is an occasional pest of tree fruit, including apple and pear. Cage experiments with adults placed on apple and peach during critical plant growth stages demonstrate that it can cause damage to developing fruit d ...
Malus domestica; apples; biotechnology; carbon; flowering; fruit drop; fruit growing; fruiting; gas exchange; gauges; organic foods; regression analysis; shade; solar radiation; trees
Abstract:
... Fruit development and the fate of fruits was followed on ‘Imperial Gala’ apple (Malus × domestica Borkh.) trees thinned chemically or using shading. The percentage fruit drop, fruit growth rates using callipers and electronic gauges, and whole tree gas exchange rates were measured before, during, and after covering with a shading cloth that blocked 90% of solar radiation, applied for 1 week starti ...
... The knowledge of the molecular mechanisms underlying fruit quality traits is fundamental to devise efficient marker-assisted selection strategies and to improve apple breeding. In this study, cDNA microarray technology was used to identify genes whose expression changes during fruit development and maturation thus potentially involved in fruit quality traits. The expression profile of 1,536 transc ...
... The developmental changes of carbohydrates, organic acids, amino acids and phenolic compounds in ‘Honeycrisp' apple flesh were investigated using GC-MS and HPLC. A total of 12 carbohydrates, 8 organic acids, 20 amino acids, and 18 phenolic compounds were identified and quantified. Each metabolite showed characteristic changes during fruit development, but in general, concentrations of most sugars ...
... Three genes encoding flavonoid 3'-hydroxylase (F3'H) in apple (Malus x domestica), designated MdF3'HI, MdF3'HIIa, and MdF3'HIIb, have been identified. MdF3'HIIa and MdF3'HIIb are almost identical in amino acid sequences, and they are allelic, whereas MdF3'HI has 91% nucleotide sequence identity in the coding region to both MdF3'HIIa and MdF3'HIIb. MdF3'HI and MdF3'HII genes are mapped onto linkage ...
... Bag-controlled release fertilizer is a new type of controlled-release fertilizer designed to meet the needs of the large individual volume characteristic of fruit trees. The effect of bag-controlled release fertilizer on nitrogen (N) utilization, growth-rate, and fruiting was investigated using 'Fuji' apple trees (M. domestica Borkh. cv. 'Fuji'/M.hupehensis Rhed.). The results showed that the avai ...
apples; crops; cultivars; dwarfing; field experimentation; flowering; fruit quality; fruit trees; fruiting; messenger RNA; reverse transcriptase polymerase chain reaction; rootstocks; scions; transgenes; transgenic plants; vegetative growth
Abstract:
... Although cultivation of genetic modified (GM) annual crops has been steadily increasing in the recent 10 years, the commercial cultivation of GM fruit tree is still very limited and reports of field trials on GM fruit trees are rare. This is probably because development and evaluation of GM fruit trees require a long period of time due to long life cycles of trees. In this study, we report results ...
... Volatile compound production was studied in terms of biosynthetic gene expression in apple ('Tsugaru'). To this end, we first analysed the endogenous and emitted volatiles in the skin of ripened apple fruit. GC-MS and GC analyses suggested that the boiling point of the endogenous compounds in apple skin is an important determinant of the composition and amount of emitted volatiles. Since esters an ...
... The FRUITFULL (FUL) and SHATTERPROOF (SHP) genes are involved in regulating fruit development and dehiscence in Arabidopsis. We tested the hypothesis that this class of genes are also involved in regulating the development of fleshy fruits, by exploring genetic and phenotypic variation within the apple (Malus domestica) gene pool. We isolated and characterised the genomic sequences of two candidat ...
Malus domestica; apples; fruit crops; Pentatomidae; insect pests; plant pests; plant damage; signs and symptoms (plants); feeding behavior; cultivars; solar radiation; ultraviolet radiation; temporal variation; ripening; fruiting
Abstract:
... Three main types of stink bug injury have been reported on the surface of apple fruit: (1) discolored dots, (2) discolored dots with depressions, and (3) discolored dots with discolored depressions. From 2005 to 2008, studies were performed to determine the factors linked to the variations in the appearance of adult stink bug injury on apple fruit observed at harvest. The main factors tested were ...
anthocyanins; pulp; flowering; apples; shelf life; total soluble solids; fruiting; storage time; leaf water potential; fruit quality; firmness; fruit drop; color; fruit composition; Malus domestica; irrigation scheduling; titratable acidity; antioxidants; cold storage; ascorbic acid
Abstract:
... We investigated the effects of withholding irrigation (WHI) at various stages of apple fruit development in improving fruit quality at harvest, particularly fruit colour without adversely affecting storage life and quality. WHI treatments were applied during stage II and III of fruit development commencing from 135, 145 and 155 days after full bloom (DAFB). Treatments were (i) T1, commercial irrig ...
anthocyanins; carbon dioxide; irrigation water; flowering; apples; shelf life; total soluble solids; controlled atmosphere storage; food storage; leaf water potential; deficit irrigation; fruit quality; firmness; irrigation management; color; fruit composition; Malus domestica; oxygen; fruiting; cold storage
Abstract:
... This study aimed to develop an irrigation strategy for apples to improve fruit skin colour without adversely affecting postharvest life and quality. Regulated deficit irrigation (RDI) at different levels [(i) 100%, commercial irrigation (CI) (70 L·h-1); (ii) 25% RDI (50 L·h-1); (iii) 50% RDI (35 L·h-1); and (iv) 75% RDI (20 L·h-1)] was applied from 135 days after full bloom (DAFB) continuously for ...
... The magnitude of real-time changes in reflectance of ripening apple (Malus × domestica Borkh., cv. Antonovka) fruit induced by PAR irradiation (500μEm⁻² s⁻¹) was monitored together with pigment composition and non-photochemical dissipation of absorbed light energy. In fruit with high chlorophyll content irradiation induced, within 180s, a notable decrease of reflectance in the bands centred at 520 ...
... Apple fruit are subject to multiple stressors during pre- and post-harvest development. Stress-induced reactive oxygen species (ROS) can be detrimental to the fruit, and ascorbic acid (AsA) is involved in many of the antioxidant pathways that detoxify ROS. An inclusive study to characterize AsA dynamics in 'Delicious,' 'Golden Delicious,' and 'Fuji' apples during pre- and post-harvest development ...
... Fruit softening in apple (Malus x domestica) is associated with an increase in the ripening hormone ethylene. Here, we show that in cv Royal Gala apples that have the ethylene biosynthetic gene ACC OXIDASE1 suppressed, a cold treatment preconditions the apples to soften independently of added ethylene. When a cold treatment is followed by an ethylene treatment, a more rapid softening occurs than i ...
... The recent shift of Rhagoletis pomonella Walsh (Diptera: Tephritidae) from its ancestral host hawthorn to apple is a model for incipient sympatric speciation in action. Previous studies have shown that changes in the over-wintering pupal diapause are critical for differentially adapting R. pomonella flies to a difference in the fruiting times of apples vs. hawthorns, generating ecologically based ...
... Esters are an important component of apple (Malus×domestica) flavour. Their biosynthesis increases in response to the ripening hormone ethylene, but their metabolism by carboxylesterases (CXEs) is poorly understood. We have identified 16 members of the CXE multigene family from the commercial apple cultivar, ‘Royal Gala’, that contain all the conserved features associated with CXE members of the α ...
... A new series of dwarfing apple rootstocks was selected from open pollinated seedlings of Malus baccata (L.) Borkh., a wild Malus rootstock resource in Northwest-Shanxi province of China. Five hundred seventy-one plants out of 150,000 seedlings were selected, which formed flower buds in the same year they were planted and bloomed the next year. Among these, 325 selections bore fruit in the year of ...
... Neilsen, G. H. and Neilsen, D. 2011. Consequences of potassium, magnesium sulphate fertilization of high density Fuji apple orchardsConsequences of potassium, magnesium sulphate fertilization of high density Fuji apple orchards. Can. J. Soil Sci. 91: 1013–1027. Three annual broadcast fertilizer treatments of 0, 100 or 200 kg K ha–¹ as K, Mg sulphate (KMag) were applied in a randomized complete blo ...
air; apples; crops; firmness; fruit quality; fruit trees; fruiting; fruits; phase transition; small fruits; storage time; texture
Abstract:
... Firmness is a primary measure of apple fruit texture, the key determinant of eating quality of apples. Despite the well developed understanding of the process of firmness loss in storage, there is very limited information concerning pre-harvest and at-harvest causes of the variation in fruit quality in the marketplace. The objective of the present study was to investigate the respective roles that ...
... Fruit thinning programs are vital to obtain high quality fruit that allows the grower to compete in international markets. In some pear growing areas, chemical thinning practices are less used than in apples. Usually some chemicals applied to apples have less effect in pears, like NAA, or do not have any effect, like carbaryl. However, there are studies that show the efficacy of benzyladenine (BA) ...
air temperature; apples; atmospheric precipitation; climate; climate change; cultivars; flowering; frost; fruit growing; fruit trees; fruiting; harvesting; leaves; meteorological data; orchards; pears; phenology; soil air; soil temperature; summer; water stress
Abstract:
... Meteorological data more than 50 years (1958-2010) from the University of Bonn, Klein-Altendorf research centre's own weather station, including air and soil temperature as well as precipitation, were analysed for climate change effects. Phenological data over 50 years on hand-written filing cards were calendar dates of full bloom, harvest and leaf drop, as well as late frost and consequent yield ...
... The vacuolar H⁺-pyrophosphatase (VHP) is a proton pump, which energizes transport across the tonoplast. The contributions of VHP to ion, organic acid and sugar storage are unclear in fruit. Here we characterized the role of an apple vacuolar H⁺-pyrophosphatase gene (MdVHP1) in Na⁺, malate and soluble sugar accumulation. MdVHP1 expression was consistent with VHP activities in apple fruits at most d ...
... Ethylene plays an important role in apple fruit development and its biosynthesis is catalyzed by the two enzymes ACS (1-aminocyclopropane-1-carboxylate synthase) and ACO (1-aminocyclopropane-1-carboxylic acid oxidase). Within the apple ACS gene family, at least two members, MdACS1 and MdACS3, are expressed in apple fruit tissues. While MdACS1 expresses only at late ripening stages corresponding to ...
... Adequate K, Mg and Ca supply is important to develop well-structured and functional cell walls and membranes in fruit, and insufficient levels or imbalances of these minerals are known to be involved in various postharvest disorders. Microclimatic variation exists in the ‘Nules Clementine’ mandarin tree canopy and results in lower photosynthetically active radiation (PAR) levels and temperature as ...
... An oligonucleotide-based microarray for apple was developed consisting of ~40,000 sequences, along with positive and negative controls, obtained from 34 cDNA libraries constructed from both vegetative and reproductive tissues at different stages of development, varying genotypes, and under different biotic and abiotic stresses. This apple microarray was used to investigate global gene expression p ...
... Cytosolic NAD-dependent malate dehydrogenase (cyMDH) is an enzyme crucial for malate synthesis in the cytosol. The apple MdcyMDH gene (GenBank Accession No. DQ221207) encoding the cyMDH enzyme in apple was cloned and functionally characterized. The protein was subcellularly localized to the cytoplasm and plasma membrane. Based on kinetic parameters, it mainly catalyzes the reaction from oxalacetic ...
... Nitric oxide (NO) is a key signaling molecule in different physiological processes of plants. To study the metabolism of endogenous NO in growth and development of apple fruit under normal physiological conditions, the changes of several relative components of NO metabolism including the contents of NO, l-arginine, S-nitrosothiols (RSNOs) and nitrite plus nitrate, the activities of l-arginine-depe ...
cultivars; dry matter content; apples; fruits; nitrogen content; small fruits; nitrogen; total soluble solids; herbicides; fruit quality; firmness; fruit drop; color; fertigation; fruit yield; mineral content; fruit trees; fruiting; vegetative growth
Abstract:
... To improve the productivity and quality of the apple cultivar ‘Pigeon’ the influence of 5 fertigation levels (14, 42, 70, 112, 224mgN/l) and 3 widths of herbicide strip (0.2, 0.5, 1.0m) were investigated on growth, yield and post-harvest quality/colour development of fruit. ‘Pigeon’ apples are picked when ca. 20% of the fruit skin has turned red, the fruit are then exposed to a sunning period on t ...
... Peach rusty spot, an economically important disease of peach (Prunus persica var. persica), appears as necrotic spots on fruit. The etiology of the disease is still not well understood, although it has long been suspected that the causal agent is the apple powdery mildew pathogen, Podosphaera leucotricha. This work confirmed this hypothesis based on cross-inoculation experiments and analysis of rD ...
harvest date; crop production; orchards; canopy; apples; photosynthetically active radiation; total soluble solids; leaf area index; fruit quality; growing season; firmness; labor; planting; rootstocks; Malus domestica; trees; fruit growing; fruiting; Chile
Abstract:
... In Chile, like in other countries, a high percentage of apple (Malus domestica Borkh) orchards are grafted on vigorous or semi-vigorous rootstocks. The need to decrease the amount of labor involved and increase efficiency has motivated this study on the effect of reducing the height of cv. Ultra Red Gala/MM111 trees in a commercial orchard in the Maule Region of Chile. Apple trees were planted in ...
... Fruit ripening is a developmental process and is associated with increased susceptibility to mechanical injury, which favours Botrytis cinerea infection. Using ‘Gala’ apples harvested at different stages of ripening, we demonstrated that wounding can activate initial H₂O₂ accumulation and wound healing ability to defend against B. cinerea penetration. Delaying the harvest date attenuated those res ...
apples; carbon; crop production; fruit growing; fruiting; fruits; greenhouses; simulation models; weather; New York
Abstract:
... Chemical thinning remains one of the more unpredictable parts of apple production with large variations within years and from year to year. We have measured this variability each year from 2000-2009 on mature 'Royal Gala'/M.9, 'McIntosh’/M.9 and 'Ace Delicous'/M.26 trees. Our data suggest the variability in thinner efficacy is related both to stage of fruit development and carbohydrate availabilit ...
... This paper addresses the identification and characterization of developmental patterns in the whole structure of a sympodial species, the apple tree. Dedicated stochastic models (hidden variable-order Markov chains) were used to (i) categorise growth units (GUs) on the basis of their morphological characteristics (number of nodes and presence/absence of flowering) and position along axes, (ii) ana ...
... Plant architecture governs living conditions of herbivores. In fruit trees, the perennial structure is modulated by training and pruning which may affect pests. The effect of tree architecture manipulation on the development of the rosy apple aphid Dysaphis plantaginea (RAA) was investigated from 2002 to 2009 in apple orchards. The first step (2002-2005) consisted in comparing the Centrifugal Trai ...
... It has been well documented that FERTILIZATION-INDEPENDENT ENDOSPERM (FIE) plays important regulatory roles in diverse developmental processes in model plant Arabidopsis thaliana. However, it is largely unknown how FIE genes function in economically important crops. In this study, MhFIE gene, which was previously isolated from apomictic tea crabapple (Malus hupehensis Redh. var. pingyiensis), was ...
... Ecophysiological sink-strength models, developed to explain/predict fruit growth at the fruit/shoot level, considered each fruit as one sink. Models have been developed for several fruits but not for apple. The variable number and size of apple fruit, developing within each inflorescence, needed therefore some attention. It is assumed in this study that inflorescence sink strength, which we suppos ...
... We investigated the effect of 9,10-ketol-octadecadienoic acid (KODA), which is synthesized from linolenic acid by 9-lipoxygenase, on 1-aminocyclopropane-1-carboxylate (ACC) synthase and ACC oxidase gene expression, their enzyme activities, and ethylene production in apple fruit [Malus sylvestris (L.) Mill. Var. domestica (Borkh.) Mansf.]. The fruit was treated with C-KODA, which is a derivative of ...
... Italy could be considered the main apple-producing country in the European Union. Italian apple (Malus domestica L. Borkh.) production is estimated at approximately 2.1 million tons and encompasses a wide range of cultivars, harvested from August to November. Colletotrichum acutatum, which causes severe losses to strawberry production, was a regulated organism for all European countries until 2008 ...
harvest date; cultivars; volatile compounds; acetates; apples; consumer acceptance; fruits; total soluble solids; principal component analysis; starch; fruit quality; firmness; titratable acidity; color; Malus domestica; emissions; fruiting; Spain
Abstract:
... The effect of strain on fruit color development and anthocyanin content, fruit quality, volatile compound emissions and consumer acceptability was evaluated on seven ‘Fuji’ apple strains (Malus domestica Borkh.) at the IRTA (Spain) over a period starting three weeks commercial harvest in 2008 and ending one week after harvest. Based on fruit color, measured with a portable tristimulus colorimeter, ...
apples; early development; florigen; flowering; fruit trees; fruiting; fruits; genes; genotype; inflorescences; linkage groups; phenotypic variation; physiological regulation; quantitative trait loci
Abstract:
... Although flowering in mature fruit trees is recurrent, floral induction can be strongly inhibited by concurrent fruiting, leading to a pattern of irregular fruiting across consecutive years referred to as biennial bearing. The genetic determinants of biennial bearing in apple were investigated using the 114 flowering individuals from an F1 population of 122 genotypes, from a ‘Starkrimson’ (strong ...
cultivars; apples; fruits; total soluble solids; fluorescence; ambient temperature; fruit quality; chlorophyll; fruiting
Abstract:
... Sunburn of apple fruit is one of the major problems in fruit production areas with high light and temperature environment. Fruit with sunburn are predisposed to develop postharvest disorders and need to be separated from the fruit considered for mid to long-term storage. In order to identify specific characteristics for non-invasive, automatic selection of fruit with sunburn, the effect of sunburn ...
survival rate; apples; longevity; autumn; growth and development; roots; seasonal variation; rootstocks; Malus domestica; fruit trees; fruiting
Abstract:
... Both the production and longevity of fine roots have great impacts on the growth and development of fruit trees. To determine whether different dwarfing rootstocks and interstems could affect fine root longevity, root diameter, and peak-production season, minirhizotrons were used to examine root production, senescence, and mortality over two years in six apple (Malus domestica Borkh.) rootstock/in ...
... Three genes encoding anthocyanidin reductase (ANR) in apple (Malusxdomestica Borkh.), designated MdANR1, MdANR2a, and MdANR2b, have been cloned and characterized. MdANR1 shows 91% identity in coding DNA sequences with MdANR2a and MdANR2b, while MdANR2a and MdANR2b are allelic and share 99% nucleotide sequence identity in the coding region. MdANR1 and MdANR2 genes are located on linkage groups 10 a ...
... Fractions of absorbed light energy consumed via photochemistry and different thermal dissipation processes was quantified and compared between the sun-exposed peel and the shaded peel of apple fruits at different developmental stages. During fruit development, the fraction of absorbed light consumed via photochemistry was no more than 7% in the sun-exposed peel and no more than 5% in the shaded pe ...
... During fruit development, the concentration of main polyphenols (flavonols, flavanols, dihydrochalcones, hydroxycinnamic acids, anthocyanins) and the activities of related enzymes (phenylalanine ammonia lyase, chalcone synthase/chalcone isomerase, flavanone 3-hydroxylase, dihydroflavonol 4-reductase, flavonol synthase, peroxidase) were monitored in apple (Malus domestica Borkh.). The seasonal surv ...
... The pomegranate, native to Persia, had its first domestication in Iran about 2000 BC. The name, pomegranate, owes its origin to Latin; “pome” meaning apple, and “granate” meaning many seeded and it was, initially called Malum granatum, meaning seeded apple. From the place of its origin, the pomegranate spread to nearby areas, such as the Mediterranean and subsequently reached eastern countries lik ...