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Author : Isabelle Marjorie Verry
Publisher :
ISBN 13 :
Total Pages : 308 pages
Book Rating : 4.:/5 (155 download)
Download or read book Dormancy in Wheat Grain (Triticum Aestivum L.) written by Isabelle Marjorie Verry and published by . This book was released on 1978 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Bahman Ehdaie
Publisher :
ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.3/5 (129 download)
Download or read book The Effect of Glume Pigmentation on the Post-harvest Dormancy of Common Wheat, Triticum Aestivum L. written by Bahman Ehdaie and published by . This book was released on 1968 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Judith Rebecca Rathjen
Publisher :
ISBN 13 :
Total Pages : 378 pages
Book Rating : 4.:/5 (433 download)
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.
Author : Cong Rong Cheng
Publisher :
ISBN 13 :
Total Pages : 304 pages
Book Rating : 4.:/5 (948 download)
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
Author : Manoel Carlos Bassoi
Publisher :
ISBN 13 :
Total Pages : 478 pages
Book Rating : 4.:/5 (79 download)
Download or read book Quantitative Trait Analysis of Grain Dormancy in Wheat (Triticum Aestivum L. Thell). written by Manoel Carlos Bassoi and published by . This book was released on 2001 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas Benjamin Biddulph
Publisher :
ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.:/5 (271 download)
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.
Author : David Adolf Sander
Publisher :
ISBN 13 :
Total Pages : 138 pages
Book Rating : 4.:/5 (646 download)
Download or read book The Nature of Dormancy in Common Red Wheat (Triticum Aestivum L.). written by David Adolf Sander and published by . This book was released on 1964 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Russell D. Freed
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.3/5 (129 download)
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:
Author : Lekkala Vijayasimha Reddy
Publisher :
ISBN 13 :
Total Pages : 204 pages
Book Rating : 4.:/5 (939 download)
Download or read book Effect of Temperature on Seed Dormancy and Alpha-amylase Activity During Kernel Maturation and Germination in Wheat (Triticum Aestivum L.) Cultivars written by Lekkala Vijayasimha Reddy and published by . This book was released on 1978 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effect of temperature on seed dormancy, alpha-amylase activity and kernel weight in five wheat (Triticum aestivum L.) varieties was studied. Three ripening temperature conditions - 15.5°C, 26.6 °C and "Field" were used to induce dormancy. Alpha-amylase activity and kernel weight of developing kernels was determined every ten days after anthesis until maturity. Dormancy in kernels was examined at germination temperatures of 15. 5°C, 20°C and 26. 6°C. Alpha- amylase activity during germination of kernels was determined on 1st, 2nd, 3rd and 6th day. In developing kernels alpha-amylase activity peaked at 10 to 20 days after anthesis and dropped or levelled-off as the kernels approached maturity. This was observed at both 15.5°C and 26.6° C . However, the peak was not obvious at 26.6°C because of the enzyme activity was lower at this temperature than at 15.5°C. In kernels ripened in field, the enzyme activity fluctuated apparently depending upon the changes in weather conditions, especially temperature. A faster growth of kernels and higher final dry kernel weight were noticed at 26.6°C and field temperature conditions than at 15.5°C. Significant varietal differences were observed in both alpha-amylase activity in kernels and kernel weight during the development and maturation of kernels. Kernels of all varieties, ripened at 26.6 °C, germinated as fast as non-dormant check kernels at 15.5°C but exhibited varying degrees of dormancy when germinated at 20 °C and 26.6°C. In contrast, kernels of Brevor, Tom Thumb and P.I. 178211, ripened at 15.5 °C showed a high level of dormancy as shown by their failure to germinate at 20 °C and 26.6 °C, and slow germination at 15.5° C. Kernels of Hyslop and Yamhill, ripened at 15.5°C, did not show dormancy at 15.5°C but showed some dormancy at 20°C and 26.6°C. This dormancy, however, was less than in Brevor, Tom Thumb and P.I. 178211. Field ripened kernels of Yamhill and Hyslpp when germinated at 15.5°C, did not show any dormancy; whereas, P.I. 178211, Brevor and Tom Thumb expressed different degrees of dormancy. Kernels of all varieties, ripened in the field, when germinated at 20°C or 26.6 °C, showed different degrees of dormancy except Yamhill. Yamhill did not differ significantly from the one year old non-dormant check kernels at 26.6° C . A substantial increse in alpha-amylase occurred only in germinated kernels. Although kernels of all varieties ripened at 26.6°C showed about the same weighted germination percentage at 15.5°C, germinated kernels of Yamhill, Hyslop and P.I. 178211 and had highly significant greater alpha-amylase activity than those of Brevor and Tom Thumb. In general, lower alpha-amylase activity was observed at higher germination temperatures. However, the data indicate that the enzyme activity depends to some extent on the ripening temperature conditions. Thus the results indicated that seed dormancy, alpha-amylase activity and kernel weight are determined by the genotype of a variety and influenced by the temperature during maturation and germination of kernels.
Author : Geoffrey Graham Fraser
Publisher :
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.:/5 (233 download)
Download or read book Endogenous Germination Inhibitors in the Seed Dormancy of Wheat written by Geoffrey Graham Fraser and published by . This book was released on 1980 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Daryl Mares
Publisher : CRC Press
ISBN 13 : 0429712081
Total Pages : 576 pages
Book Rating : 4.4/5 (297 download)
Download or read book Fourth International Symposium On Pre-harvest Sprouting In Cereals written by Daryl Mares and published by CRC Press. This book was released on 2019-04-01 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: A major constraint on the production of high-quality grain around the world, pre-harvest sprouting in cereal crops causes substantial economic losses to producers and disrupts the processing, distribution, marketing, and storage of grain products. The solution to this problem must include a better understanding of the phenomenon, the development of
Author : Chengdao Li
Publisher : Frontiers Media SA
ISBN 13 : 2889457621
Total Pages : 235 pages
Book Rating : 4.8/5 (894 download)
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.
Author : Kent Bradford
Publisher : John Wiley & Sons
ISBN 13 : 1405173270
Total Pages : 392 pages
Book Rating : 4.4/5 (51 download)
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.
Author : Mian Abdur Rehman Arif
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (839 download)
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 0 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.
Author : Victor Louis DeMacon
Publisher :
ISBN 13 :
Total Pages : 96 pages
Book Rating : 4.:/5 (342 download)
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:
Author : Kåre Ringlund
Publisher :
ISBN 13 :
Total Pages : 5 pages
Book Rating : 4.:/5 (248 download)
Download or read book Seed Dormancy and Alpha Amylase Activity in Wheat, Triticum Aestivum L written by Kåre Ringlund and published by . This book was released on 1970 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Andrew Hoffman Paterson
Publisher :
ISBN 13 :
Total Pages : 324 pages
Book Rating : 4.E/5 ( download)
Download or read book Phenomenological Studies on Genetics and Physiology of Grain Dormancy in White-kernelled Wheats written by Andrew Hoffman Paterson and published by . This book was released on 1988 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
