Download or read book Studies on Seed Quality Storability and Dormancy in New Sunflower Helianthus Annuus L Hybrids and Their Parents written by Lakshmi J and published by . This book was released on 2004 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by and published by . This book was released on 1982 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Morphological differences between high and low yielding hybrids of sunflower; A study of the morphological characters of sunflower achenes in relation to their emergence under adverse conditions; The effects of ethephon on dormant seeds of cultivated sunflower (Helianthus annuus L.); Pathways of yields elaboration in sunflower under various water stresses; The behaviour of some sunflower genotypes (Helianthus annuus L.) under various flooding regimes; Tolerance of sunflower hybrids to competition among plants; Growth analysis irrigated sunflower at two plant populations; Estimation of leaf area on sunflower plants; Photosynthesis in sunflower leaves: RUBP carboxylates properties activities and quantitative determination; Effects of defoliation during seed filling of sunflower plants; Evolution for biosynthesis during the cycle of development of sunflower, and assimilates partition among organs and constituents; The sunflower roots activity in the field; Effect of daylength in the time of inflorescence initiation and rate of post-initiation development in two early sunflower cultivars; Yield and harvest index of sunflower cultivars: influence of duration and water stress; Determination of physiological nad harvest maturity in sunflower; Effect of physiological maturation on quantitative characters of sunflower varieties and hybrids; Growth and development of sunflower in a semi-arid environment; Determination of regional strategies for sunflower production; Effect of early spring planting of sunflower on yield in Iraq; Oil content oi oilseed sunflower (Helianthus annuu L.) hybrids grown in Texas, USA; Effect of the planting date of sunflowers on the agronomic characteristics and on the quantity and quality of oil; A technique for selecting sunflower genotypes with temperature-stable linoleic acid synthesis; Water requirement of sunflower in a semi-arid environment; Effect of irrigation on water use pattern in sunflower root zone; Influence of plant population on phasic development, growth, yield and water use of irrigated sunflower in a semi-arid environment; The response of sunflower to strategies of irrigation; Salinity and sunflower agronomy in Egypt; Effect of sodium chloride on the lipid composition of sunflower oil; Nitrogen nutrition of sunflower with special reference to nitrogen stress; Effect of nutritional and cultural treatments on seed production on winter grown sunflower; The response of irrigated sunflower cultivars to nitrogen fertilizer; Studies of the uptake of soil and fertilizer nitrogen by sunflower using 15-N techniques; Interactions between moisture supply, N and P, in the performance of an open-pollinated and a hybrid sunflower variety in a semi-arid environment; Differential response to two sunflower cultivars to boron fertilization; Effect of phosphorus and nitrogen fertilization levels on the yield and oil content of sunflower (Helianthus annuus L.); Pollination studies in hybrid sunflower seed production; Sunflower hollow seededness and nitrogen fertilization in relation to harvest time; Effect of achene (seed) size on subsequent growth and development of hybrid sunflower (Helianthus annuus L.); Behaviour of NS sunflower hybrids harvested at different seed moistures; Evaluation of losses in the harvesting of sunflower; Maturity and seed quality in sunflower: physiobiochemical assessment through accelerated ageing; Irrigated sunflower production from the red-brown soils of Northern Victoria; Irrigated sunflower in the Ord River Valley; Potential for pest management in sunflowers in Australia; Insect and mite pests of Queensland sunflowers; Seasonal abundance of the Rutherglen bug (Nysius vinitor) on sunflowers and weeds in N.E. Victoria; Effect of moisture stress on damage to sunflowers by Rutherglen bug (Nysius vinitor); Sunflower seed yield as influenced by pollination and insect pests; Effect6 of maldison (malathion) ULV) on sunfloer insects; Phytomelanin: development and role in hybrid resistance of Homoeosoma electellum larvae (Lepidoptera: Pyrallidae); The control of alternaria blight of sunflowers in Eastern Australia; Some factors affecting the incidence and importance of sunflower rust in Australia; Investigations into increased rust (Puccinia helianthi) intensity on some hybrid sunflower cultivars grown in Queensland; Occurrence of sunflower diseases in Portugal in the last four years (1978 - 1981); White blister and petiole blight of sunflowers caused by Albugo tragopogonis; Stemphylium sp. the agent of reddish-brown spot on sunflowers stem; Further studies on the sunflower disease caused by Diaporthe (Phomopsis) helianthi and possibilities of breeding for resistance; A leaf spot disease of sunflower caused by Septoria sp.; The distribution, and incidence of charcoal rot of sunflower in Eastern Australia; Effect os stand density on the occurrence of charcoal rot and oil yield of some sunflower hybrids; Methods of studying the reaction of some cultivars and wild species of sunflower to infection by Sclerotinia sclerotiorum (Lib) de Bary; Field inoculation of sunflower for Sclerotinia sclerotiorum basal stalk rot and virulence of isolates from various hosts; Coniothyrium minitans as a treatment for sclerotinia wilt of sunflowers; The use of high frequency microwaves on sclerotia to control inoculum of Sclerotinia sclerotiorum; Use of the enzyme-linked immunosorbest assay (Elisa) for the detection of downy mildew (Plasmopara halstedii) in sunflower; Resistance to a new race of sunflower downy mildew; A new race of Verticillium dahliae; Models for potential status of infection: some aspects of the functioning of the climate x plant x pest system; Models for potential status of infection: application to sunflower-botrytis; A model for the development of grey mould (Botrytis cinerea) in sunflower heads; Losses caused in sunflowers by birds in Hungary; Pest status of parrot species on sunflowers in northern N.S.W.; An innovation in the control of galahs, Cacatua roseicapilla, and sulphur-crested cockatoos, Cacatua galerita, in sunflower; The economics of chemical dessication and mechanical drying as methods of reducing bird damage in sunflower; Very early combine harvesting of sunflower to avoid bird depredation; Allelopathic activity of cultivated sunflowers; Post-emergence weed control in sunflower; Information concerning the effect of cultivation as a complement for weed control; Utilization of wild Helianthus annuus in germplasm development; Cluster analysis of wild Helianthus annuus accessions; Variability on oil content in seed pf Helianthus spp.; Variation in oil and quality of wild annual sunflower (Helianthus annuus L.) populations in a uniform environment; Variability in the composition of higher fatty acids in oil of sunflower inbreds with different oil contents in seed; Variability in protein and amino acid contents in different sunflower inbreds; Investigations into seedset in sunflowers; Effect of isolation bags on seedset in sunflowers; Effect of stigmatic manipulation of pollination and seedset in sunflowers; The inheritance of drought tolerance in sunflower; Inheritance of plant height and leaf number in diallel crossing of sunflower inbreds; Inheritance of trichome characteristics in sunflower, Helianthus spp.; Genetic implications in transfering fertility restorer genes to a new genetic background in sunflower Helianthus annuus L.); Correlations for important agronomic characters between parent lines and F1 hybrids of sunflower; Relationships among traits of inbreds and hybrids of sunflower; Maternal and embryo effects on the oleic and linoleic acid contents of sunflower oil; Maternal and paternal effects on the oil content of cypsela in F1 seed; Genetic effect of days to flowering in sunflower (Helianthus annuus L.) under short day regimes; Epistatic gene action in sunflower - a caution to sunflower geneticists and breeders; Use of multivariate techniques in a breeding programme to assit selection of sunflower inbreds and hybrids; Stratified masal selection on sunflower as breeding method for synthetic varieties for forage or grain; Selection of sunflower plants containing high linoleic acid and its agronomic significance; Selection in sunflowers for resistance to Rutherglen bug (Nysius vinitor); Chemically induced mutations in sunflower; Genetic advances by mass selection in the oil percentage of sunflower (Helianthus annuus L.); Performance of early maturing hybrids in Manitoba, Canada; Sunflower variety evaluation, Coonabarabran, NSW, Australia; Evaluation of sunflower hybrids in international trial plantings; Plant breeder's rights and varieties registration in France; An objective description of sunflower for varietal registration, plant variety protection and other purposes; Oil quality analyser; TBHQ in sunflower oil; Utilization of sunflower oil in making plastic fat products for edible uses by miscella interesterification process; Plant oils as a fuel for diesel engines: experiences with sunflower oil; Energy farming update: the bio-oil option?; Lysine availabity in sunflower meals for pigs and chiks; What will the market place expect from sunflower?.
Download or read book Studies on Influence of Provenance and Packaging Material on Seed Quality and Storability of Sunflower Helianthus Annuus L Hybrids written by C.K. Bhavya and published by . This book was released on 2016 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Maternal Effects on Multiple Generations of Helianthus Annuus Crop wild Hybrid Seed written by Brian Alexander Pace and published by . This book was released on 2012 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Although gene flow between crop and wild relatives is not a new area of study, much can still be learned through the investigation of hybrids between divergent taxon. Most crops exchange alleles with wild and weedy relatives, especially when grown in crop centers of origin. Such gene flow can result in evolutionary consequences for wild populations ranging from genetic erosion and demographic swamping to the evolution of enhanced weediness. All of these scenarios are concerning, since wild populations constitute a breeding pool in which valuable allelic diversity is stewarded and weeds already cause problems in agriculture. Helianthus annuus was domesticated in North America where its cultivated and wild forms have been known to hybridize when grown in proximity. However, cultivated sunflower and its relative, common sunflower, differ in morphology, ecological habit, and life history. For example, dormancy differs between crop and wild sunflower types since it was selected against during domestication, but has remained necessary for maintaining fitness for wild plants. Sunflower has physiological dormancy, but the strength and duration of dormancy differs between wild and crop types. Achenes resulting from hybridization between crop and wild sunflower have been shown to have reduced dormancy compared to wild achenes. Although the introgression of crop alleles into wild populations cannot occur unless the F1 generation survives to reproduce, the dormancy of later generations is important for determining if this trait could provide significant resistance to introgression. The objectives of this work were twofold: to identify how maternal parent and differing crop allele percentages each affect seed germination, dormancy, and mortality. Here, fifteen hybrid crosstypes were created on three different maternal plant types - wild F1 crop-wild hybrid, and crop. Since the pericarp and seed coat of sunflower achenes are maternal tissue, contrasting the three maternal types allowed for investigation of the impact of maternal effects in crop-wild sunflower hybrids on achene germination, dormancy, and survival. The genetic composition of these crosstypes varied from 0% to 100% crop alleles, with six intervening levels. All fifteen crosstypes were surveyed in a seed burial study, while two crosstypes were included a companion pericarp manipulation experiment. In the field experiment, three removal dates were chosen to assess hybrid seed germination, dormancy, and mortality. The contribution of crop alleles, maternal parent, and their interaction affected achene germination, dormancy, and survival. While crosstypes with higher crop allele percentages had increased early spring mortality compared to wild achenes, all crosstypes had high overwinter survival, indicating that reduced dormancy is not a complete barrier to crop allele introgression. However, hybrid achenes produced on wild maternal parents had high levels of dormancy that was comparable to wild dormancy, while crop-produced and F1-produced achenes had little to no dormancy by the last removal date, indicating that only hybrids produced on wild maternal plants will persist in the seed bank. Hybrid achenes remaining in the seed bank can be recruited in future years to backcross with wild plants or cross with remaining hybrids and may increase the risk of genetic erosion and demographic swamping.
Download or read book Studies on Maturity Dormancy and Storability in Seven Sunflower Helianthus Annuus L Genotypes written by P. Bhaskara Rao and published by . This book was released on 1989 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on Flowering Behaviour of Parental Lines Seed Setting Seed Yield Quality and Storage Behaviour of Hybrids in Sunflower Helianthus Annuus L written by A. B. Narayanareddy and published by . This book was released on 2012 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on Some Seed Technological Aspects of Sunflower Helianthus Annuus L Hybrids and Their Parents written by RAMAIAH H and published by . This book was released on 1994 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on Seed Physiological Quality of Sunflower Helianthus Annuus L Hybrids for Abiotic Stresses written by B. Yashaswini and published by . This book was released on 2017 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Germination and Dormancy of Crop wild Sunflower Hybrid Cross Types written by Alexa Weiss and published by . This book was released on 2012 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Gene flow from agricultural crops into related wild plant populations can produce viable hybrid offspring with characteristics that differ significantly from those of their wild counterparts. Such crop-wild gene flow, especially in situations involving transgenic crops, has raised concerns about potential losses of genetic diversity, or increases in invasiveness, of wild relatives. The annual sunflower (Helianthus annuus) is an ideal species for studying crop-wild gene flow, the subsequent hybrid generations produced, and the effects on wild populations because the crop and wild types are often found in close proximity, are cross compatible, share pollinators, and are differentiated for important traits that may affect fitness, such as seed dormancy. Outside of cultivation, seeds that germinate in the fall are killed by the winter frost before reproducing, which has lead to the evolution of dormancy in wild populations; their seeds must experience a cold period before germinating in the spring. By contrast, cultivated varieties have been artificially selected to germinate immediately under favorable conditions. Consequently, the degree to which crop-wild hybrids germinate under fall conditions affects the extent to which crop genes may persist in, or introgress into, wild populations. Furthermore, the germination and dormancy characteristics of sunflower seeds, in particular, are due, in part, to the structural characteristics of their achenes (i.e., seeds and hulls). Most of these structures are maternally inherited while the genetics of the embryo involve contributions from both parents. This project determined the rates of germination and dormancy of fifteen crop-wild hybrid sunflower cross types and used microscopy to explore achene characteristics that could influence the differential germination we observed. Maternal effects (e.g., seed covering structures) had significant impacts on germination and dormancy, with crop-produced achenes germinating most readily, followed by those produced on F1 maternal plants, followed by those produced on wild plants. 3 The proportion of crop alleles (i.e., nuclear genetics of the embryo) was also important. There was a significant, positive relationship between the proportion of crop alleles and germination in the wild and F1 produced seeds. Microscopy revealed that maternal parent significantly affected achene size, embryo size, and relationships between structures and the micropylar (i.e., pointed) end of the achene. Crop produced achenes were largest and had minimal structural barriers to radicle (i.e, embryonic root) extension. F1 produced achenes were larger and had more substantial barriers which broke down quickly. Wild produced achenes were smallest and had the greatest barriers to radicle extension. Although they differed in size, structural characteristics, and germination rate, seeds produced on crop, F1, and wild maternal parents underwent the same general processes of leading up to germination. These findings suggest that crop alleles and the maternal effects associated with crop-wild hybridization can reduce dormancy, but that this reduction in dormancy may not be significant enough to prevent the introgression of crop alleles into wild populations.
Download or read book Seed Dormancy Studies in Sunflower Helianthus Annuus L Physical Basis Of and Intraction Between Material and Embryo Tissues Over Seed Dormancy written by K. S. Krishna Murty and published by . This book was released on 1990 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on Physiological and Biochemical Changes Associated with Deterioration During Storage of Hybrid Seeds of Sunflower Helianthus Annuus L written by T. V. Naflath and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dormancy Regulation in Conventional and Oleic Sunflower Lines Helianthus Annuus L written by Brent LaVerne Reschly and published by . This book was released on 2005 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sunflower (Helianthus annuus L.), is currently the second most important source of vegetable oil in the world. Seed dormancy in sunflowers poses a risk for off-season seed production in South America. Seed companies must hold the seed lots from sale until they meet minimum germination specifications and will not pose a risk for the customer. This investigation was undertaken to examine the differences in dormancy between SF270, a traditional oil sunflower hybrid, and X8927 a mid oleic sunflower hybrid. Seed was grown in Texas in 1999 and 2000. Samples were divided between three storage temperatures, constant 10°C, constant 14°C, and ambient room temperature and tested two times per month. The standard warm germination test, alternating 20-30°C warm germination test, and the ethrel warm germination test were used to evaluate germination and develop a dormancy profile for each genotype. A mathematical model was developed to calculate the average number of days to a specific germination value based on the laboratory germination data. The genotype SF270 broke dormancy soon after harvest, often before initial laboratory germination analysis could be completed. Genotype X8297 took longer to break dormancy than the traditional oil genotype. Both genotypes broke dormancy in a consistent pattern across the two production years. Storage of seed at constant 10°C, and constant 14°C prolonged the dormancy in both genotypes but, was more pronounced in the X8927 genotype. Storage at ambient room temperature had the most significant effect on breaking dormancy in the two genotypes. Of the three germination tests, the ethrel warm germination test was the best predictor of laboratory germination. Although these two genotypes cannot be considered representative of all genotypes, this study produced two very useful tools for seed producers. The model to calculate the average number of days after harvest to reach the target 85% germination goal, and the depth of dormancy or longevity of dormancy for a particular genotype. These tools can be used as a risk assessment tool to plan seed production placement, shipping, and anticipate product release.
Download or read book Evaluation of New Sunflower Helianthus Annuus L Hybrids and Their Parents for Yield Agronomic Attributes and Necrosis Virus Disease written by PRIYADARSHINI S. N and published by . This book was released on 2001 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hybrid Seed Yield Quality of Sunflower Helianthus Annuus L as Influenced by Branching and Non branching Restorer Lines written by ESWAR DHASS H and published by . This book was released on 1996 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Investigations on Seed Set Seed Yield and Quality of Parental Lines and Hybrids in Sunflower Helianthus Annuus L written by VYAKARANAHAL B. S and published by . This book was released on 1998 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on Storage of Pre Released Hybrids of Sunflower Helianthus Annuus L written by K. Nataraj and published by . This book was released on 2008 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies on Synchronization of Flowering in Parental Lines and Standardization of Hand Pollination Frequencies in KSHB 44 Hybrid Sunflower Helianthus Annuus L Seed Production written by SATISH P and published by . This book was released on 2002 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt:
