Download or read book On the Pathogenesis of Soybean Cyst Nematode and Mechanisms of Resistance by Soybean written by Vincent Colantonio and published by . This book was released on 2017 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soybean cyst nematode (SCN), Heterodera glycines Ichinohe, is the most devastating pathogen of soybeans, Glycine max (L.) Merr., causing over $1 billion in yield losses annually in the United States alone. Currently, planting of genetically resistant cultivars is the most commonly employed management strategy. Due to an overuse of genetic resistance derived from the soybean variety 'PI 88788', many populations of soybean cyst nematodes are becoming virulent on previously resistant cultivars, urging the understanding and discovery of alternative mechanisms of SCN resistance. In this study, we will delve into the history and epidemiology of Heterodera glycines, learn about the molecular etiology underlying SCN pathogenesis, begin to understand the mechanism of resistance by Peking-type soybeans, and look to discover a novel mechanism of resistance by establishment of a mutagenized population of the soybean variety 'PI 567516C'.
Download or read book Investigating Soybean Cyst Nematode Resistance written by Katelyn Butler and published by . This book was released on 2018 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soybean cyst nematode (SCN; Heterodera glycines) is consistently ranked as the most economically damaging pathogen of soybean, a globally important oilseed and protein crop. To manage this persistent pathogen, growers rely primarily on crop rotation and genetic resistance. For decades, Rhg1 has been the primary resistance locus deployed in most commercial soybean varieties. Resistance at Rhg1 is conferred by three types of gene products not previously known to mediate plant defense. Gene copy number variation and expression/localization differences contribute to this resistance. In the present work we demonstrate that Rhg1 can also confer resistance in potato and Arabidopsis against the cyst nematodes Globodera pallida, Globodera rostochiensis and Heterodera schactii. This supports the hypothesis that Rhg1 evolved to interfere with conserved cyst nematode infection processes. This finding suggests biotechnology-based management strategies for cyst nematodes in other crops. SCN evolution necessitates new resistance sources in soybean. The remainder of this thesis describes the identification and characterization of novel resistance genes from two independent SCN resistance QTL originating from Glycine soja accession PI 468196, cqSCN-006 and cqSCN-007. I discovered that altered regulation of a ɣ-SNAP protein encoded at cqSCN-006 confers resistance. An [alpha]-SNAP protein contributes to Rhg1-mediated resistance, underscoring the importance of SNAP proteins and their associated activity in cyst nematode pathogenesis. cqSCN-006 resistant plants exhibit differential accumulation of the ɣ-SNAP protein and expression of alternative splice forms at infection sites. Little is known about the function of ɣ-SNAPs in any system, and even less in plants. I have identified a role of ɣ-SNAPs in SCN response. I also report progress towards identifying the gene encoding resistance at G. soja QTL cqSCN-007. While no gene(s) has been confirmed to confer resistance, a RAD21-like gene is the strongest candidate. The upstream region of the resistant allele contains a large deletion and exhibits differences in gene expression. Studies of cyst nematode resistance continually expand plant defense paradigms. The work in this thesis reveals additional intricacies of this pathosystem, laying the groundwork for further exploration of soybean-SCN interaction and improved plant protection strategies.
Download or read book Analysis of Soybean Gene Regulation Reveals Regulatory Mechanisms of Rhg1 mediated Resistance to Soybean Cyst Nematode written by Usawadee Chaiprom and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterizing Rhg1 Mediated Soybean Resistance to Soybean Cyst Nematode Using Functional and Computational Approaches written by and published by . This book was released on 2013 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Domesticated soybean, Glycine max, is an important world commodity accounting for 68% of world protein meal and 56% of world oilseed production. Soybean cyst nematode (SCN, Heterodera glycines) causes billions of dollars of economic losses annually and is considered the most economically damaging soybean disease. A previously identified locus, termed Rhg1, has a significant impact on SCN resistance, and is currently deployed in most commercially utilized SCN resistant soybean cultivars. The mechanism underlying Rhg1-mediated SCN resistance has remained elusive. This dissertation focuses on functional and computational approaches to define and characterize the genes underlying Rhg1-mediated SCN resistance. We identified three tightly clustered genes at the Rhg1 locus that each contributes to SCN resistance. We further discovered that the DNA encoding these genes is present in multiple copies in SCN-resistant parents, and this causes elevated expression of the genes. Two of the identified genes, Glyma18g02580 and Glyma18g02610, did not carry amino acid polymorphisms between resistant and susceptible Rhg1 haplotypes. The third gene, Glyma18g02590, encoding a predicted &alpha-SNAP protein did contain amino acid polymorphisms relative to the reference soybean genome Williams 82, which is SCN-susceptible. Transgenic expression of any one of these three genes in soybean roots did not discernibly improve resistance, but simultaneous expression of all three genes did enhance SCN resistance. To further explore the evolution and diversity of Rhg1, we used whole genome sequencing, fiber-FISH and related techniques to examine the structural and nucleic acid variation in the genomes of four-dozen soybean accessions. We discovered that the Rhg1 locus is commonly arranged in a single copy in all tested SCN susceptible germplasm, but is present as either a low-copy or high-copy type in SCN-resistant germplasm. These repeat copy classes are also distinguishable by expression level differences, and the presence of related but distinct alleles of the previously identified &alpha-SNAP protein. We also identified differential DNA-methylation at the locus between SCN-resistance and susceptible lines. The identification of the genes that control Rhg1-mediated resistance, and an understanding of their evolution and diversity, should foster efforts to improve the disease resistance that is available to reduce the deleterious impacts of SCN.
Download or read book Structural Modifications Associated with Resistance and Susceptibility of Selected Plants Infected with Heterodera Glycines Ichinohe written by Young Ho Kim and published by . This book was released on 1985 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plant Nematode Interactions written by and published by Academic Press. This book was released on 2015-03-26 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Botanical Research publishes in-depth and up-to-date reviews on a wide range of topics in plant sciences. Currently in its 73rd volume, the series features several reviews by recognized experts on all aspects of plant genetics, biochemistry, cell biology, molecular biology, physiology and ecology. This thematic volume features reviews on molecular and developmental aspects of the compatible plant-nematode interaction. The contributors all actively work in the field of molecular genetics and genomics of plant parasitic nematodes and nematode feeding sites. Reviews focus on molecular and physiological aspects of nematode feeding site development and includes specific chapters on nematode effectors as well as plant responses. Publishes in-depth and up-to-date reviews on a wide range of topics in plant sciences This volume features reviews of the fast moving field of compatible interaction between plants and sedentary endo-parasitic nematodes A strong focus on molecular and physiological aspects of nematode feeding site development and includes specific chapters on nematode effectors as well as plant responses
Download or read book The Soybean Genome written by Henry T. Nguyen and published by Springer. This book was released on 2017-09-20 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the application of soybean genome sequences to comparative, structural, and functional genomics. Since the availability of the soybean genome sequence has revolutionized molecular research on this important crop species, the book also describes how the genome sequence has shaped research on transposon biology and applications for gene identification, tilling and positional gene cloning. Further, the book shows how the genome sequence influences research in the areas of genetic mapping, marker development, and genome-wide association mapping for identifying important trait genes and soybean breeding. In closing, the economic and botanical aspects of the soybean are also addressed.
Download or read book The Handbook of Plant Functional Genomics written by Guenter Kahl and published by John Wiley & Sons. This book was released on 2008-09-08 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this incisive, concise overview of this booming field, the editors -- two of the leading figures in the field with a proven track record -- combine their expertise to provide an invaluable reference on the topic. Following a treatment of transcriptome analysis, the book goes on to discuss replacement and mutation analysis, gene silencing and computational analysis. The whole is rounded off with a look at emerging technologies. Each chapter is accompanied by a concise overview, helping readers to quickly identify topics of interest, while important, carefully selected words and concepts are explained in a handy glossary. Equally accessible to both experienced scientists and newcomers to the field.
Download or read book Cellular and Molecular Aspects of Plant Nematode Interactions written by Carmen Fenoll and published by Springer Science & Business Media. This book was released on 1997 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1992 a Concerted Action Programme (CAP) was initiated by Peter Sijmons with the purpose of intensifying collaborations between 16 European laboratories working on plant-parasitic nematodes. The four-year programme entitled Resistance Mechanisms Against Plant-Parasitic Nematodes focused on molecular aspects of the interaction between sedentary nematodes and plants on the model system Arabidopsis and on novel resistance strategies. Funding was provided mainly for exchange visits between collaborating laboratories and for the organization of annual meetings. During the last annual meeting which was held in May 1996 in Toledo, Spain, Carmen Fenoll initiated the production of this volume.
Download or read book Genomics and Molecular Genetics of Plant Nematode Interactions written by John Jones and published by Springer Science & Business Media. This book was released on 2011-04-26 with total page 563 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews developments in the molecular biology of plant-nematode interactions that have been driven by the application of genomics tools. The book will be of interest to postgraduate students and to researchers with an interest in plant nematology and/or plant pathology more generally. A series of introductory chapters provide a biological context for the detailed reviews of all areas of plant-nematode interactions that follow and ensure that the bulk of the book is accessible to the non-specialist. A final section aims to show how these fundamental studies have provided outputs of practical relevance.
Download or read book Induced Resistance for Plant Defense written by Dale R. Walters and published by John Wiley & Sons. This book was released on 2014-10-20 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Induced resistance offers the prospect of broad spectrum, long-lasting and potentially environmentally-benign disease and pest control in plants. Induced Resistance for Plant Defense 2e provides a comprehensive account of the subject, encompassing the underlying science and methodology, as well as research on application of the phenomenon in practice. The second edition of this important book includes updated coverage of cellular aspects of induced resistance, including signalling and defenses, costs and trade-offs associated with the expression of induced resistance, research aimed at integrating induced resistance into crop protection practice, and induced resistance from a commercial perspective. Current thinking on how beneficial microbes induce resistance in plants has been included in the second edition. The 14 chapters in this book have been written by internationally-respected researchers and edited by three editors with considerable experience of working on induced resistance. Like its predecessor, the second edition of Induced Resistance for Plant Defense will be of great interest to plant pathologists, plant cell and molecular biologists, agricultural scientists, crop protection specialists, and personnel in the agrochemical industry. All libraries in universities and research establishments where biological, agricultural, horticultural and forest sciences are studied and taught should have copies of this book on their shelves.
Download or read book The Cyst Nematodes written by S.B. Sharma and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 466 pages. Available in PDF, EPUB and Kindle. Book excerpt: When Franklin published her book on cyst nematodes in 1951, the cyst nematodes were already known as serious pests of brassicas, cereals, potatoes and sugar beets. However, at that time this group of nematode, with about 12 species, was considered tobe largely temperate in distribu tion. Now a total of 105 species (including those that are considered as synonyms or species inquirende by some or all) within six genera of cyst nematodes have been described from temperate, tropical, and subtropical regions and at least five species are important constraints to crop produc tion in tropical agriculture. The previous impression of localization of cyst nematodes in the temperate region was seemingly an artifact due to a greater concentration of nematologists in the temperate regions. Based on my own experience of working in several Asian and African countries, I believe that many more undescribed species are present in the tropical countries of Asia and Africa, and probably in other tropical regions. Most growers, extension workers, and research managers in these regions are still not aware of the possible harm of presence of these nematodes in their agricultural soils. The cyst nematodes are perhaps smaller than the smallest available computer chip but they are very well programmed to survive and pro pagate despite severe hardships. These nematodes are very selective in their choice of food; about 50% of known species are parasites of plants mainly in the families Poaceae and Fabaceae.
Download or read book Cyst Nematodes written by Roland N Perry and published by CABI. This book was released on 2018-04-09 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a compendium of current information on all aspects of these economically important parasites. It provides comprehensive coverage of their biology, management, morphology and diagnostics, in addition to up-to-date information on molecular aspects of taxonomy, host-parasitic relationships and resistance. Written by a team of international experts, Cyst Nematodes will be invaluable to all researchers, lecturers and students in nematology, parasitology, agriculture and agronomy, industries with an interest in chemical and biological control products for management of plant-parasitic nematodes, and any courses, quarantine and advisory services.
Download or read book Plant Nematology 3rd Edition written by Roland N. Perry and published by CABI. This book was released on 2024-07-12 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plant-parasitic nematodes are a major threat to crop production in all countries, and identification of nematodes and knowledge of their biology is of paramount importance. Providing a broad introduction to nematodes as plant parasites, this book begins by describing nematodes by genera, and then builds on this foundation to detail nematode biology and pest management, including resistance, and biological and chemical control. This 3rd edition is updated to address advances in our knowledge of plant-parasitic nematodes, particularly concerning the molecular aspects of host-parasite relationships, including the application of genomics to nematode biology. Changes in control and management strategies are also covered. The influence of climate change on plant-parasitic nematodes is addressed in a new chapter on ecology. Primarily aimed at students (MSc and PhD), this book is also invaluable for researchers and lecturers in nematology, plant pathology and parasitology, advisory and quarantine services, and crop protection scientists.
Download or read book Experimental and Conceptual Plant Pathology written by R. S. Singh and published by CRC Press. This book was released on 1988 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Cyst Nematodes written by S. B. Sharma and published by . This book was released on 2014-01-15 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Soybean written by Guriqbal Singh and published by CABI. This book was released on 2010 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: The soybean is a crop of global importance and is one of most frequently cultivated crops worldwide. It is rich in oil and protein, used for human and animal consumption as well as for industrial purposes. Soybean plants also play an important role in crop diversification and benefit the growth of other crops, adding nitrogen to the soil during crop rotation. With contributions from eminent researchers from around the world, The Soybean provides a concise coverage of all aspects of this important crop, including genetics and physiology, varietal improvement, production and protection technology, utilization and nutritional value.
