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Loss Of Seed Dormancy And The Relationship Between Dormancy And Embryo Culture In Wheat Triticum Aestivum L
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Book Synopsis Loss of Seed Dormancy and the Relationship Between Dormancy and Embryo Culture in Wheat (Triticum Aestivum L.) by : Victor Louis DeMacon
Download or read book Loss of Seed Dormancy and the Relationship Between Dormancy and Embryo Culture in Wheat (Triticum Aestivum L.) written by Victor Louis DeMacon and published by . This book was released on 1995 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seed Dormancy and Germination by : J. W. Bradbeer
Download or read book Seed Dormancy and Germination written by J. W. Bradbeer and published by Springer Science & Business Media. This book was released on 2013-03-13 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: The germination of seeds is a magical event, in which a pinch of dust-like material may give rise to all the power and the beauty of the growing plant. The mechanisms of seed dormancy, of the breaking of seed dormancy and of germination itself continue to remain shrouded in mystery, despite the best efforts of plant scientists. Perhaps we are getting there, but very slowly. This book considers germination and dormancy from the point of view of plant physiology. Plant physiologists attempt to understand the relation ship between plant form and function and to explain, in physical and chemical terms, plant growth and development. The place of germination and dormancy in plant ecophysiology is taken into account with attempts to understand the seed in its 'environment, whether the environment be natural, semi-natural or wholly artificial. In due course plant scientists hope to develop a precise understanding of germination and dormancy in cellular and molecular terms, and therefore there is some biochemistry in this book. Biochemists who wish to learn something about seeds should find this book useful.
Book Synopsis Seed Dormancy, Germination and Pre-Harvest Sprouting by : Chengdao Li
Download or read book Seed Dormancy, Germination and Pre-Harvest Sprouting written by Chengdao Li and published by Frontiers Media SA. This book was released on 2019-03-28 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pre-harvest sprouting (PHS) and late-maturity alpha-amylase (LMA) are two of the biggest grain quality defects that grain growers encounter. About 50 percent of the global wheat crop is affected by pre-harvest sprouting to various degrees. Pre-harvest sprouting is a genetically-based quality defect and results in the presence of alpha-amylase in otherwise sound mature grain. It can range from perhaps undetectable to severe damage on grain and is measured by the falling numbers or alpha-amylase activity. This is an international issue, with sprouting damage lowering the value of crops to growers, seed and grain merchants, millers, maltsters, bakers, other processors, and ultimately the consumer. As such it has attracted attention from researchers in many biological and non-biological disciplines. The 13th International Symposium on Pre-Harvest Sprouting in Cereals was held 18-20 September, 2016 in Perth to discuss current findings of grain physiology, genetic pathways, trait expression and screening methods related to pre-harvest sprouting and LMA. This event followed the previous symposium in 2012 in Canada.
Book Synopsis Seedcoat Color and Dormancy in Triticum Aestivum L. by : Russell D. Freed
Download or read book Seedcoat Color and Dormancy in Triticum Aestivum L. written by Russell D. Freed and published by . This book was released on 1972 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Role of the Seed Coat in the Dormancy of Wheat (Triticum Aestivum) Grains by : Judith Rebecca Rathjen
Download or read book Role of the Seed Coat in the Dormancy of Wheat (Triticum Aestivum) Grains written by Judith Rebecca Rathjen and published by . This book was released on 2006 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pre-harvest sprouting (PHS) is an important economic problem which affects a significant proportion of the Australian wheat crop through quality downgrading. Grain dormancy is the most effective means of overcoming germination in the wheat spikelet at harvest maturity. It has been a consistent observation over a long period of time that dormant red-grained wheat genotypes are almost more dormant than dormant white-grained genotypes. In white-grained wheat, there are two factors which contribute to dormancy, embryo sensitivity to abscisic acid (ABA) and an interacting and unknown seed coat factor. The proposed dormancy model is that complete dormancy can only be achieved with the coordinate expression of these two factors. This primary objective of this project was to determine the role of this putative seed coat factor in grain dormancy of white-grained wheat."--Abstract.
Book Synopsis Mechanisms of Dormancy, Preharvest Sprouting Tolerance and how They are Influenced by the Environment During Grain Filling and Maturation in Wheat (Triticum Aestivum L.) by : Thomas Benjamin Biddulph
Download or read book Mechanisms of Dormancy, Preharvest Sprouting Tolerance and how They are Influenced by the Environment During Grain Filling and Maturation in Wheat (Triticum Aestivum L.) written by Thomas Benjamin Biddulph and published by . This book was released on 2006 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated abstract] Wheat is the main crop in Australia and there are stringent quality requirements. Preharvest sprouting induced by rainfall between maturity and harvest lowers grain quality from premium to feed grades and reduces yield. Wheat production has expanded into the southern Western Australian region where preharvest sprouting occurs in ~1 in 4 seasons and development of more preharvest sprouting tolerant genotypes is required. The main mechanism for improving preharvest sprouting tolerance is grain dormancy. There is genetic variation for dormancy based in the embryo and seed coat but dormancy is complex and is influenced by environmental conditions during grain filling and maturation. Screening and selecting for preharvest sprouting tolerance is problematic and the level of tolerance needed for regions which differ in the level of dormancy they impose, requires clarification. The research presented here aims to answer the underlying question for breeders of how much dormancy is required for preharvest sprouting tolerance in contrasting target environments of the central and coastal wheat belt regions of Western Australia. In the central and coastal wheat belt regions, field trials with modified environments were used to determine the environmental influence on dormancy. Water supply (without directly wetting the grain) and air temperature were modified during grain development in a range of genotypes with different mechanisms of dormancy to determine the influence of environment on dormancy. ... Genotypes with embryo dormancy were consistently the most preharvest sprouting tolerant, even though this dormancy was influenced by the environmental conditions in the different seasons. Pyramiding the embryo component with the specific seed coat component and/or awnless head trait removed some of the environmental variation in preharvest sprouting tolerance, but this was generally considered excessive to the environmental requirements. The methods developed here, of field imposed stresses may provide a valuable tool to further understand the influence of environment on the regulation of dormancy, as different phenotypes can be made with the same genotype. Moisture stress, sudden changes in water supply or high temperatures during the late dough stages influenced dormancy phenotype and should be considered and avoided if possible when selecting locations and running trials for screening for genetic differences in preharvest sprouting tolerance. In the Western Australian context, the embryo component of dormancy appeared to be sufficient and should be adopted as the most important trait for breeding for preharvest sprouting tolerance.
Book Synopsis Effect of High Temperature Shock During Grain Maturation on Dormancy of Wheat (Triticum Aestivum L.) and Analysis of TaDOG1 by : Cong Rong Cheng
Download or read book Effect of High Temperature Shock During Grain Maturation on Dormancy of Wheat (Triticum Aestivum L.) and Analysis of TaDOG1 written by Cong Rong Cheng and published by . This book was released on 2015 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pre-harvest sprouting (PHS) is the germination of seed under wet environmental conditions whilst still on the mother plant prior to harvest. In wheat, PHS causes farmers substantial economic losses due to quality downgrading. A high level of dormancy is regarded as an important mechanism of resistance to PHS in cereal species, such as wheat (Triticum aestivum L.). Many dormancy quantitative trait loci (QTL) have been identified and the corresponding genes that impart tolerance to PHS are actively being sought. Besides genetic factors, environmental conditions during grain maturation have been shown to have profound effects on dormancy. These environmental factors include temperature, light, drought and nutrients. This project aimed to determine the role of high temperature shock during wheat seed maturation on its dormancy at harvest-ripeness. The results of these experiments showed that seed of dormant or intermediate dormant wheat genotypes may have lower dormancy levels after experiencing a high temperature shock (5 days of 40°C). The highest sensitivity towards high temperature shock is limited to a short "window" of approximately five days starting around 25 dpa. The sensitivity increases and reaches a peak at 25 to 30 days post anthesis (dpa), causing an effective and quicker release of dormancy. The sensitivity later decreases and high temperature becomes less influential on dormancy. For the dormant genotype SUN325B, release from dormancy occurred 35 days earlier if treated with temperature shock. There was no significant correlation between the timing of the peak of sensitivity and factors such as daily temperatures before temperature shock, humidity or subsequent grain moisture losses. However, the stronger the intensity (40°C versus 35°C) and longer duration (5 days versus
Book Synopsis Physiological and Biochemical Aspects of Agrobacterium-Wheat (Triticum Aestivum L.) Interactions by : David L. Parrott Jr.
Download or read book Physiological and Biochemical Aspects of Agrobacterium-Wheat (Triticum Aestivum L.) Interactions written by David L. Parrott Jr. and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Agrobacterium tumefaciens and A. rhizogenes are the causal agents of gall or hairy root disease, but normally the bacteria do not cause disease in wheat. However, both bacteria grew without inhibition when exposed to intact or wounded wheat roots or embryos, and they colonized wheat root surfaces to levels similar to dicotyledonous plants. A. tumefaciens and A. rhizogenes induced 23% cell death after a 1-h exposure to wheat embryo cells grown in 7.4 mM O2, while the extent of cell death at 2.1 mM 02 was 8%. Contact with A. tumefaciens or A. rhizogenes caused cultured wheat embryo and root cells to rapidly produce H202, which decreased when embryos and roots were cultured at 2.1 mM O2. Browning and autofluorescence, and an increase in ferulic acid in cell walls, were observed in wheat embryo and root epidermal cells exposed to Agrobacterium, but. neither lignin nor callose was detected. Agrobacterium appeared to induce resistance-like responses in wheat that may limit transformation efficiency. The inability to regenerate wheat plants using tissue culture has been a limitation to high efficiency transformation. Regeneration via somatic embryogenesis was improved significantly by simulating the in ovulo environment to which the immature wheat embryos are exposed. Triticum embryo culture medium (TEC) improved callus formation, somatic embryo formation, and regeneration from somatic embryos while reducing precocious germination when compared to growth on Murashige and Skoog medium. Regeneration frequencies were improved when embryos were cultured at the O2 concentration found in the wheat ovule (2.1 mM O2) rather than atmospheric 02concentration (7.4 mM O2). Agrobacterium-mediated transformation of wheat was limited by tissue necrosis following co-cultivation, and by poor plant regeneration. Reduction of necrosis and increased plant regeneration were accomplished by amending the culture medium with antioxidant compounds and by reducing the O2 tension in which the wheat embryos were cu1tured. Twelve days past anthesis (DPA), wheat embryos were co-cultivated with Agrobacterium tumefaciens strains WAg 11 or EHA 101, incubated on TEC medium containing antioxidant compounds (catalase, cysteine and ascorbic acid), and cultured at 2.1 mM O2 concentrations. Transformation was documented in 6.0% of regenerated A. tumefaciens WAg 11 exposed wheat plants using the firefly luciferase (luc) reporter system.
Book Synopsis Seed Longevity and Dormancy in Wheat (Triticum Aestivum L.) by : Mian Abdur Rehman Arif
Download or read book Seed Longevity and Dormancy in Wheat (Triticum Aestivum L.) written by Mian Abdur Rehman Arif and published by . This book was released on 2012 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was undertaken to map quantitative trait loci (QTLs) and marker trait associations (MTAs) controlling seed longevity and dormancy in wheat using one bi-parental and two association mapping populations. QTL analysis of bi-parental 'International Triticeae Mapping Initiative' population reproduced in two different seasons resulted in the identification of one major and nine minor QTLs for seed longevity. There was one major QTL for dormancy observed on chromosome 4AL. The location of this QTL does not match with any of the longevity QTLs. One set of 96 winter wheat accessions (advanced gemplasm collection) and one set of 183 accessions consisting of a mixture of spring and winter wheat (genebank collection) revealed 73 and 340 MTAs for seed longevity, respectively. Of the 340 MTAs, 134 MTAs were observed after long term cold storage but the others after experimental ageing in genebank collection. The associations were distributed over all the wheat chromosomes except 4D which was not covered with markers. Results obtained after long term cold storage and experimental ageing did match only to some extent in this study which could be due to different quality of seeds produced during different seasons. However, it also can be proposed that different mechanisms are involved during deterioration in cold storage over long periods and decaying during artificial ageing treatments. For dormancy, there were 68 and 118 MTAs identified in the advanced germplasm collection and genebank collection, respectively, in addition to one major QTL on chromosome 4A in the ITMI population. Similarly, pre-harvest sprouting revealed 32 and 193 MTAs in case of advanced germplasm collection and genebank accessions, respectively. Co-linearity was found among wheat, rice and barley for loci influencing dormancy and PHS.
Book Synopsis Proceedings of the Western Society of Weed Science by : Western Society of Weed Science (U.S.)
Download or read book Proceedings of the Western Society of Weed Science written by Western Society of Weed Science (U.S.) and published by . This book was released on 1999 with total page 604 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seeds written by J. Derek Bewley and published by Springer Science & Business Media. This book was released on 2012-10-23 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: This updated and much revised third edition of Seeds: Physiology of Development, Germination and Dormancy provides a thorough overview of seed biology and incorporates much of the progress that has been made during the past fifteen years. With an emphasis on placing information in the context of the seed, this new edition includes recent advances in the areas of molecular biology of development and germination, as well as fresh insights into dormancy, ecophysiology, desiccation tolerance, and longevity. Authored by preeminent authorities in the field, this book is an invaluable resource for researchers, teachers, and students interested in the diverse aspects of seed biology.
Book Synopsis Annual Plant Reviews, Seed Development, Dormancy and Germination by : Kent Bradford
Download or read book Annual Plant Reviews, Seed Development, Dormancy and Germination written by Kent Bradford and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: The formation, dispersal and germination of seeds are crucial stages in the life cycles of gymnosperm and angiosperm plants. The unique properties of seeds, particularly their tolerance to desiccation, their mobility, and their ability to schedule their germination to coincide with times when environmental conditions are favorable to their survival as seedlings, have no doubt contributed significantly to the success of seed-bearing plants. Humans are also dependent upon seeds, which constitute the majority of the world’s staple foods (e.g., cereals and legumes). Seeds are an excellent system for studying fundamental developmental processes in plant biology, as they develop from a single fertilized zygote into an embryo and endosperm, in association with the surrounding maternal tissues. As genetic and molecular approaches have become increasingly powerful tools for biological research, seeds have become an attractive system in which to study a wide array of metabolic processes and regulatory systems. Seed Development, Dormancy and Germination provides a comprehensive overview of seed biology from the point of view of the developmental and regulatory processes that are involved in the transition from a developing seed through dormancy and into germination and seedling growth. It examines the complexity of the environmental, physiological, molecular and genetic interactions that occur through the life cycle of seeds, along with the concepts and approaches used to analyze seed dormancy and germination behavior. It also identifies the current challenges and remaining questions for future research. The book is directed at plant developmental biologists, geneticists, plant breeders, seed biologists and graduate students.
Book Synopsis Sustainable Food Production by : Paul Christou
Download or read book Sustainable Food Production written by Paul Christou and published by Springer. This book was released on 2012-12-05 with total page 1869 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gathering some 90 entries from the Encyclopedia of Sustainability Science and Technology, this book covers animal breeding and genetics for food, crop science and technology, ocean farming and sustainable aquaculture, transgenic livestock for food and more.
Download or read book The Barley Genome written by Nils Stein and published by Springer. This book was released on 2018-08-18 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents an overview of the state-of-the-art in barley genome analysis, covering all aspects of sequencing the genome and translating this important information into new knowledge in basic and applied crop plant biology and new tools for research and crop improvement. Unlimited access to a high-quality reference sequence is removing one of the major constraints in basic and applied research. This book summarizes the advanced knowledge of the composition of the barley genome, its genes and the much larger non-coding part of the genome, and how this information facilitates studying the specific characteristics of barley. One of the oldest domesticated crops, barley is the small grain cereal species that is best adapted to the highest altitudes and latitudes, and it exhibits the greatest tolerance to most abiotic stresses. With comprehensive access to the genome sequence, barley’s importance as a genetic model in comparative studies on crop species like wheat, rye, oats and even rice is likely to increase.
Book Synopsis A Protocol to Determine Seed Storage Behaviour by : T. D. Hong
Download or read book A Protocol to Determine Seed Storage Behaviour written by T. D. Hong and published by Bioversity International. This book was released on 1996 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication provides an approach by which conservationists can determine whether or not long-term seed storage is feasible for a particular species, i.e. whether or not that species shows orthodox seed storage behaviour, and provides advice on the implementation of the protocol, examples of ways in which the results from seed storage studies could be misinterpreted due to confounding factors, as well as several alternative approaches for estimating seed storage behaviour prior to carryng out actual investigations with the seeds. In particular, the latter section introduces the concept of a multicriteria approach for estimating seed storage behaviour.
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1975 with total page 1922 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Plant Molecular Biology Manual by : Stanton Gelvin
Download or read book Plant Molecular Biology Manual written by Stanton Gelvin and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
