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... Commercially available sunflower oil and the same oil distilled additionally in a molecular evaporator (to remove naturally occurring compounds) was spiked with benzo[a]pyrene (BaP) at the levels of 37.1 and 38.6 μg/kg, respectively. Then, it was filled into polyethylene terephtalate (PET) and low density polyethylene (LDPE) receptacles of cylindrical shape, and BaP concentration was followed w ...
... From available and bio-sourced methyl esters, monoglycerides or oleic sunflower refined oil, the corresponding 1-O-alkyl (di)glycerol ethers were obtained in both high yields and selectivity by two different pathways. With methyl esters, a reductive alkylation with (di)glycerol was realized under 50 bar hydrogen pressure in the presence of 1 mol% of Pd/C and an acid co-catalyst. A second two step ...
... Before the Spaniards conquered America in 1492, several ancient cultures and empires – the Aztec, Maya, Inca, and Mapuche, among them – already inhabited the two continents and had made important advances in the arts and sciences as well as in architecture, astronomy, agriculture and the domestication of crops. These peoples lived according to their own rules and in harmony with their magnificent ...
... The ¹⁵N dilution method was used for the quantitative estimation of nitrogen dioxide (NO₂) absorbed by Helianthus annuus and Zea mays during a relatively long period. The relationships between the amount of NO₂ absorbed and the concentration of NO₂ and length of exposure were investigated, in order to ascertain the reliability of this method. The total amount of NO₂‐nitrogen absorbed by the plants ...
Helianthus annuus; National Center for Biotechnology Information; bacterial communities; biofertilizers; bioinformatics; community structure; data collection; endophytes; genes; polymerase chain reaction; rain; summer; temperature; winter; South Africa
Abstract:
... Insights into plant endosphere bacterial diversity and exploration of their bioincentives in the formulation of biofertilizers promise to avert ecological disturbances. Here, we presented the sequence dataset of the endophytic bacterial community from the roots and stems of sunflower obtained from farmlands in Itsoseng and Lichtenburg, North West Province of South Africa, using 16S rRNA gene ampli ...
Helianthus annuus; Homoeosoma electellum; insect pests; trapping; Cochylis hospes; pheromone traps; population density; pest monitoring; pest identification; Texas; Manitoba; Midwestern United States; Great Plains region
... Siderophores are natural metal chelating agents that strongly control the biogeochemical metal cycles such as Fe in the environment. This article describes a new methodology to detect and quantify at the micromolar concentration the spatial distribution at millimeter scale of siderophores within the root’s system. The “universal” CAS assay originally designed for bacterial siderophores detection a ...
... Pseudomonas fluorescens is a siderophore producing bacteria that is expected to alter the mobility and bioavailability of Cu in vineyard soils due to its ability to produce pyoverdine under iron deficiency. In this study, we monitored the effect of this bacterial species, particularly the production of siderophore, on the mobility and bioavailability of copper (Cu) and other elements using a spati ...
... A passive light microscope system has been developed, capable of reconstructing an extended-focus 3-D cell-level image of chlorophyll fluorescence and ΦPSII of intact attached leaves using a limited number of focal plane images of chlorophyll fluorescence. Using this system, the relationships between the depth of the mesophyll cells in spongy tissue and the intensity of the chlorophyll fluorescenc ...
... For the sunflower fruits, hullability (H) is a technical parameter that defines how easily the hull can be broken and set apart from the kernel. H mainly depends on the morphology of the fruit and the biochemical properties of the hull. Finite element analysis (FEA) was used to model the mechanical behavior of the sunflower fruit hull after the fruit impact. A 3-D model of an entire fruit was desi ...
... The root holoparasitic weed sunflower broomrape (Orobanche cumana Wallr.) specifically infects sunflowers (Helianthus annuus L.) and causes significant loss of their quality and production. This experiment was designed to evaluate the ameliorative effects of 5-aminolevolinic acid (ALA) on susceptible sunflower (cv. TK0409) under O. cumana stress. Sunflower seeds were pretreated at five concentratio ...
... BACKGROUND: To reduce herbicide use by 75%, integrated use of sorghum and sunflower extracts each at 18 L ha⁻¹ combined with 1/4th (75% less) of label rates of four herbicides (mesosulfuron + idosulfuron, metribuzin, phenoxaprop-p-ethyl and isoproturon) were investigated for the management of wild oat and canary grass, the two pernicious weeds in wheat fields worldwide.RESULTS: The results reveale ...
... In this experiment sunflower oil, soybean oil and fish oil were incubated in rumen-fistulated adult ewes (n = 5) to study conjugated linoleic acid (CLA) production in the rumen. The individual oils were incubated in nylon bags in the rumen on perlite carrier (40% oil, 60% carrier) over a period of 2, 4, 6, 8, 10 and 12 h for all treatments. During the incubation of each oil primarily the formation ...
... Investigations conducted during last years showed serious violations of ecological equilibrium in many agricultural regions.Crops produced in these regions are commonly used as food and feed. It has been established that the content of heavy metals in the soils and agricultural crops grown nearby the metallurgical factories is much above the admissible concentration. Micro-particles of Pb, Cu, Zn ...
... Sunflower is a plant of the American continent, but now many wild species are spread in different part of the world. Along the coast of the Inhambane Bay, Mozambique, two sunflower species, H. argophyllus and H. debilis, both of Texas origin, grow far apart. However, in two sites on sandy soil they grow together and many plants have been recognized as hybrids, sharing morphological traits typical ...
... Field studies were conducted to determine the effect of early-season and early- plus late-season acetolactate synthase–resistant Helianthus annuus interference on Glycine max and H. annuus growth and yield at two sites in Missouri. Helianthus annuus densities of 3 plants m⁻² were established shortly after G. max emergence in all plots except the weed-free check. To study early-season interference, ...
... Study of inbreeding and heterosis in sunflower has been taking place for over 80 years now. Practical application of the phenomenon of heterosis in this species began after the discovery of a suitable source of cytoplasmic male sterility in 1969 and that of restorer genes. Many authors have reported significant manifestation of heterosis for seed yield and yield components as well. Also, the mode ...
... Hyperhydricity is a morphological and physiological disorder affecting plants regenerated in vitro. This malformation is associated with excessive hydration and abnormal shoot morphogenesis such as glassy water-soaked appearance of shoots. This undesirable phenomenon is a frequent problem in sunflower tissue culture systems and has been described by visual symptoms but there is no information on t ...
... Immature sunflower (Helianthus annuus L.) zygotic embryos belonging to R and B sunflower lines were treated with ultra sound and gamma rays before planting in an embryo culture medium. In those circumstances new mutant lines with the altered architecture, increased oil content, 1000-seed weight, number of seed per head, as well as seed yield were developed. Some mutant lines showed very good combi ...
... The objective of this study was to evaluate the tolerance of sunflower (Helianthus annuus) to acetyl-coenzyme A carboxylase (ACCase)-inhibiting herbicides and to temporarily delay the growth of the forage grass (Brachiariaruziziensis), avoiding competition and allowing the reestablishment of pasture. A randomized block design with four replicates was used in both experiments. The following treatme ...
M. Cantamutto; M. Poverene; A. Presotto; D. Alvarez; S. Lenardon; R. Rodríguez; J. Martín Sánchez; I. Fernández Moroni; F. Giolitti; A. Garayalde; A. Haucke; A. Bellido; M. Fraysse
... Wild Helianthus annuus naturalized in Argentina could be a valuable germplasm source for cultivated sunflower. Five wild populations collected in different environments and with different phenotype expression were evaluated as a genetic resource in a common garden study. The populations showed normal meiosis and produced a good seed set when their plants pollinated the male-sterile inbred line A09 ...
... Drought and heat stress that prevail during critical growth stages are amongst the most important constraints controlling yield ability of a sunflower crop. In this investigation, 73 adapted lines were evaluated under irrigated and rainy conditions using 7 checks for 100-seed weight (HSW), seed crude protein (SCP), kernel-grain ratio (KGR), hull-kernel ratio (HKR), leaf area (LA), total leaf area ...
... Leaf spot disease caused by Alternaria helianthi (Hansf.) is an important fungal disease of sunflower in India and elsewhere. Non-availability of known sources for resistance to Alternaria is a major constraint in sunflower breeding. Hence, seeds of sunflower genotypes were subjected to gamma-irradiation to develop mutant populations. Mutants were selected from the M2 generation based on percent d ...
... Broomrape (Orobanche cumana Wallr.) presents a serious problem in sunflower production in a number of countries. The population of broomrape has been stable in Serbia for a long period of time, but the racial composition has changed in recent years, with race E being predominant in the regions of north Bačka and Banat. Cultivated sunflower is genetically narrow and deficient in many desirable gene ...
... Five genotypes showing differential field reactions to Alternaria leaf and stem blight were tested for their reaction to pathogen culture filtrate under invitro conditions. The pathogen culture filtrate reduced in vitro germination, root and shoot growth and reduction was not uniform in all the genotypes. There was significant negative association between in vitro root growth and field disease sco ...
... Three varieties, CO 4, Morden and TNHSF 239 (a pre-release culture) and two hybrids, TCSH 1 and KBSH 44, were selected for this study. Simple correlation coefficients were estimated among characters for individual varieties and hybrids. Two traits, seed yield and 100-seed weight, are important selection indices for oil yield improvement in both varieties and hybrids. Head weight can be considered ...
Helianthus annuus; aboveground biomass; edaphic factors; experimental design; oxygen; regression analysis; salt marshes; soil salinity; soil water; North America
Abstract:
... This study evaluated the relationships among soil moisture, soil salinity, and soil oxygen on the growth of Helianthus paradoxus (Asteraceae), a threatened inland salt marsh species of western North America. The study was conducted in large growth boxes (1×2×0.3 m) tilted at an angle to achieve a saturated to dry water gradient similar to that found in the marsh. This experimental design allowed t ...
... Appropriate use of abscisic acid (ABA), a well-known plant growth regulator, could be beneficial to crop production under certain environmental conditions. A field experiment was conducted in both 2008 and 2009 to determine the appropriate level of ABA and the growth stages at which sunflower (Helianthus annuus L.) are sensitive to exogenous application of ABA. Sunflowers grown in fully irrigated ...
Helianthus annuus; abscisic acid; deficit irrigation; irrigation rates; leaves; photoperiod; root systems; root zone drying; roots; sap flow; shoots; simulation models; soil water; soil water content; xylem
Abstract:
... To investigate the contribution of different parts of the root system to total sap flow and leaf xylem abscisic acid (ABA) concentration ([X-ABA]leaf), individual sunflower (Helianthus annuus L.) shoots were grafted onto the root systems of two plants grown in separate pots and sap flow through each hypocotyl measured below the graft union. During deficit irrigation (DI), both pots received the sa ...
... The purpose of this study was to determine the availability of cadmium from the kernels of sunflowers grown in soils containing a natural abundance of cadmium. Weanling male rats were used as the experimental model. Fresh sunflower kernels containing either 330 or 780 microgram Cd/kg were ground and added to a purified rodent diet at 20%. Cadmium chloride was added to purified diets without kernel ...
... AIMS: Despite the importance of foliar Zn fertilisation, it remains unclear how the Zn status of the plant itself influences the efficacy of foliar applied Zn, with this forming the focus of the present study. METHODS: Sunflower (Helianthus annuus) was grown in nutrient solutions with either 0.5 (sufficient) or 0 μM Zn (deficient) to relate the absorption of foliar applied Zn to leaf properties. T ...
... The absorption and translocation of [14C]pronamide, [14C]glyphosate, and [14C]imazapyr and the metabolism of [14C]imazapyr, were studied in the Orobanche cumana–sunflower system. [14C]Pronamide was applied as a sunflower seed treatment by coating or soaking. Herbicide absorption was affected by method of seed treatment, but not the subsequent pattern of herbicide distribution within the sunflower ...
... Surveys were conducted between 1997 and 2001 to investigate the incidence of overwintering Helicoverpa spp. pupae under summer crop residues on the Darling Downs, Queensland. Only Helicoverpa armigera was represented in collections of overwintering pupae. The results indicated that late-season crops of cotton, sorghum, maize, soybean, mungbean and sunflower were equally likely to have overwinterin ...
... Insect herbivores have been assumed to be more abundant in agricultural habitats than in native habitats; however, this hypothesis is rarely tested explicitly by comparing field populations of domesticated plants and their wild ancestors. This study examined the abundance of the sunflower moth, Homoeosoma electellum (Hulst), and its parasitism by natural enemies in agricultural and native sunflowe ...
... The peroxide formation rate was measured in sunflower and soybean oils exposed to increasing light intensity, from 0 to 8000 lx, at 10, 20 and 30 °C. Results indicated that shelf life estimation of photosensitive foods under actual or accelerated conditions cannot be correctly achieved if the effect of light is not taken into account. At each lighting level, the Arrhenius equation was applied t ...
... Accelerated oxidation tests, such as the determination of the induction period, increase the lipid oxidation rate by exposing a food to elevated temperatures, in the presence of excess quantities of air or oxygen. In addition to the well-founded oxidative stability index (OSI) method, an innovative and promising technique is the oxidation test (OXITEST) reactor. A new analytical method was develop ...
David L. Van Tassel; Kenneth A. Albrecht; James D. Bever; Arvid A. Boe; Yaniv Brandvain; Timothy E. Crews; Markus Gansberger; Pedro Gerstberger; Luciana González‐Paleo; Brent S. Hulke; Nolan C. Kane; Paul J. Johnson; Elena G. Pestsova; Valentín D. Picasso Risso; Jarrad R. Prasifka; Damian A. Ravetta; Brandon Schlautman; Craig C. Sheaffer; Kevin P. Smith; Pablo R. Speranza; M. Kathryn Turner; Alejandra E. Vilela; Philipp von Gehren; Christian Wever
... Silphium perfoliatum L. (cup plant, silphie) and S. integrifolium Michx. (rosinweed, silflower) are in the same subfamily and tribe as sunflower (Helianthus annuus L.). Silphium perfoliatum has been grown in many countries as a forage or bioenergy crop with forage quality approaching that of alfalfa (Medicago sativa L.) and biomass yield close to maize (Zea mays L.) in some environments. Silphium ...
... The acclimation in relationship with virulence cost was analysed for seven Plasmopara halstedii (sunflower downy mildew) isolates including five progeny isolates of several races descending from two parental isolates of races 100 and 710. Aggressiveness criteria were analysed in one sunflower inbred line showing a high level of quantitative resistance. Isolates of races 100 and 3xx were characteri ...
... During the course of stigma development in sunflower (bud, staminate and pistillate stages), correlation is evident among the accumulation of reactive oxygen species (ROS), nitric oxide (NO), and the activities of ROS scavenging enzymes [superoxide dismutase (SOD) and peroxidase (POD)]. Confocal image analysis shows a gradual increase in ROS and NO accumulation in the stigmatic papillae, which may ...
... Sunflower (Helianthus annuus L.) seeds have a tocopherol profile dominated by alpha-tocopherol. The objective of this research was to study the dynamics of tocopherol accumulation in sunflower lines with altered total tocopherol content or tocopherol profile. Developing seeds were sampled at regular intervals in two lines with reduced and increased total tocopherol content, respectively, and six l ...
... We investigated the effects on physiological response, trace elements and nutrients accumulation of sunflower plants grown in soil contaminated with: 5 mg kg⁻¹ of Cd; 5 and 300 mg kg⁻¹ of Cd and Zn, respectively; 5, 300, and 400 mg kg⁻¹ of Cd, Zn, and Cu, respectively. Contaminants applied did not produce large effects on growth, except in Cd-Zn-Cu treatment in which leaf area and total dry matter ...
... The suitability of sunflower plants (Helianthus annuus L.) for the phytoremediation of soils and waters contaminated with radioactive iodine was tested following the 125I uptake from a hydroponic medium and translocation during 32-day cultivation. The plants accumulated about 26% of the applied activity in case of combination of 125I (1.3 MBq) and 0.1 mM K127I (“carrier 125I”) and 47% when only 12 ...
... Mycotoxigenic fungi such as Fusarium graminearum, Fusarium verticillioides and Stenocarpella maydis infecting maize grain can be detrimental to both humans and animals due to the toxins they produce. Disease management strategies include tillage practices and crop rotations, however, these have not been sufficiently evaluated in South Africa. The effect of cropping systems on ear rot accumulation ...
... Genetic purity testing is an important component of seed quality control. The objective of this study was to develop a rapid method for testing the genetic purity of sunflower seeds. We used six sunflower hybrids and their parental lines to study and improve a method based on the acetic acid urea-polyacrylamide gel electrophoresis (AU-PAGE) approach for testing the genetic purity of maize seeds. T ...