Download or read book Genetic Diversity Pathogenicity virulence Variation and Population Structure of Rhizoctonia Spp Associated with Rice Sheath Blight in Arkansas and QTL Mapping for Disease Resistance written by Vanina Lilián Castroagudín and published by . This book was released on 2012 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt: No systematic studies of the Rhizoctonia species and subspecies associated with rice sheath blight (ShB) in Arkansas have been conducted, and few studies have examined the genetic diversity of the rice ShB pathogen Rhizoctonia solani Kuhn AG 1 - IA. The objectives of this research were to assess the genetic diversity and the virulence/aggressiveness of isolates of R. solani AG 1 - IA and related Rhizoctonia spp. by specific PCR markers and sequence analysis of the ITS, RPB2 and beta-tubulin genes. Among the isolates examined, a considerable level of inter- and intra-specific variation was identified based on the molecular markers and differences in pathogenicity and pathogenicity/virulence on rice, soybean and tomato. There was significant correlation between the levels of virulence in the different crops. However, no correlation between pathogenicity/virulence differences and genotypic diversity was found. An in-depth genotypic analysis of the R. solani AG 1 - IA population from Arkansas was conducted using a multilocus sequencing analysis and SSR diversity indicated a high level of genotypic diversity and a significant degree of inbreeding. These data fit population structure with a mixed model of reproduction in which some extent of recombination (sexual/parasexual recombination) may occur, followed by clonal expansion of the fittest clones. The third objective of this study was to examine the production of specific toxins among isolates of R. solani and related species, and assess its correlation with pathogenicity/virulence. The ability to produce toxin was assessed by the presence of a signature peak in high pressure liquid chromatography (HPLC) and rice-leaf infiltration assays. Results suggested that no clear correlation exists between the capacity of an isolate to produce toxin in vitro, the ability of the toxin to cause necrosis in susceptible host tissue in an infiltration bioassay, and the capacity of the isolate to cause disease in greenhouse inoculation tests. These support the hypothesis that R. solani AG 1 - IA phytotoxin is a virulence factor with a minor contribution in disease development. The resistance to rice ShB is a polygenic and quantitative trait, and no immunity has been identified. A final objective was to map for potentially new quantitative trait loci (QTL) associated with resistance to ShB (SB-QTLs) in a population derived from a cross of two elite Indica cultivars, 'Fedearroz2000' and 'Palmar'. Results identified one significant SB-QTL with LOD > 3.0 on chromosomes 9, and three significant SB-QTLs with 1.5
Download or read book Biological Control of Rice Diseases written by Samuel S. Gnanamanickam and published by Springer Science & Business Media. This book was released on 2009-07-14 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is suf?cient need to document all the available data on biological control of rice diseases in a small volume. Part of this need rests on the global importance of rice to human life. In the ?rst chapter, I have tried to show that rice is indeed life for most people in Asia and shortages in production and availability can lead to a food crisis. While rice is cultivated in most continents, biological disease management attains special relevance to rice farmers of Africa, Asia, and also perhaps, Latin America. These farmers are resource-poor and might not be able to afford the cost of expensive chemical treatments to control devastating rice pathogens such as Magnaporthe oryzae (blast), Xanthomonas oryzae pv. oryzae (bacterial leaf blight), Rhizoctonia solani (sheath blight) and the virus, rice tungro disease. In an earlier volume that I developed under the title, Biological Control of Crop Diseases (Dekker/CRC Publishers, 2002), I included transgenic crops generated for the management of plant pathogens as biological control under the umbrella of a broad de?nition. Dr Jim Cook who wrote the Foreword for the volume lauded the inclusion of transgenic crops and induced systemic resistance (ISR) as a positive trend toward acceptance of host plant resistance as part of biocontrol. I continue to subscribe to this view.
Download or read book Protecting Rice Grains in the Post Genomic Era written by Yulin Jia and published by BoD – Books on Demand. This book was released on 2019-10-02 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on recent advances in genetic resources, host - pathogen interactions, assay methods, mechanisms of pathogenesis, and disease resistance. Environmentally benign crop protection methods for major rice diseases such as rice blast, sheath blight, bacterial blight, and newly emerged rice diseases such as false smut and bacterial panicle blight disease are included. The content also contains recent rice breeding methods for higher yield and improved disease resistance, rice processing, delicious rice recipes, and food safety. The book includes a comprehensive understanding of Bacillus thuringiensis toxin and its application for crop protection. Holistically, the book demonstrates successful applications of genomics, physiology, chemistry, genetics, pathology, soil science, and food technology to sustainably protect rice crops for global food safety.
Download or read book Advances in Rice Blast Research written by D. Tharreau and published by Springer Science & Business Media. This book was released on 2000-08-31 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 2nd International Rice Blast Conference, 4-8 August 1998, Montpellier, France
Download or read book Rice Genetics IV written by Gurdev S. Khush and published by Int. Rice Res. Inst.. This book was released on 2001 with total page 501 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geneticists contribute on a wide range of topics in this book, from classical genetics to the most advanced research on sequencing of the rice genome and functional genomics. They review advances in rice research and discuss molecular markers, genome organization and gene isolation.
Download or read book Crop Stress and its Management Perspectives and Strategies written by B. Venkateswarlu and published by Springer Science & Business Media. This book was released on 2011-11-22 with total page 617 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crops experience an assortment of environmental stresses which include abiotic viz., drought, water logging, salinity, extremes of temperature, high variability in radiation, subtle but perceptible changes in atmospheric gases and biotic viz., insects, birds, other pests, weeds, pathogens (viruses and other microbes). The ability to tolerate or adapt and overwinter by effectively countering these stresses is a very multifaceted phenomenon. In addition, the inability to do so which renders the crops susceptible is again the result of various exogenous and endogenous interactions in the ecosystem. Both biotic and abiotic stresses occur at various stages of plant development and frequently more than one stress concurrently affects the crop. Stresses result in both universal and definite effects on plant growth and development. One of the imposing tasks for the crop researchers globally is to distinguish and to diminish effects of these stress factors on the performance of crop plants, especially with respect to yield and quality of harvested products. This is of special significance in view of the impending climate change, with complex consequences for economically profitable and ecologically and environmentally sound global agriculture. The challenge at the hands of the crop scientist in such a scenario is to promote a competitive and multifunctional agriculture, leading to the production of highly nourishing, healthy and secure food and animal feed as well as raw materials for a wide variety of industrial applications. In order to successfully meet this challenge researchers have to understand the various aspects of these stresses in view of the current development from molecules to ecosystems. The book will focus on broad research areas in relation to these stresses which are in the forefront in contemporary crop stress research.
Download or read book Durability of Disease Resistance written by Th. Jacobs and published by Springer. This book was released on 1993-06-30 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: From February 24 -28, 1992 an international symposium on Durability of Disease Resistance was held at the International Agricultural Centre in Wageningen, the Netherlands. The symposium, organized by the Department of Plant Breeding of Wageningen Agricultural University and the Centre for Plant Breeding and Repro duction Research, CPRO-DLO, was part of the DGIS funded programme Durable Resistance in Developing Countries. Without any form of prevention or protection nearly all crops will be seriously or even severely damaged by a range of pathogens. In modern agriculture man has been able to control many if not most pathogens using i) pesticides, ii) phyto sanitary methods such as control of seed and plant material in order to start a crop disease free, iii) agronomic measures such as crop rotation, iv) disease resis tance or combinations of these measures. Over the years the use of pesticides has increased enormously and so did the pro blems associated with pesticide use, such as environmental pollution and building of resistance and tolerance to these pesticides in the pathogens. The use of resis tance too increased strongly over the years and here too problems arose.
Download or read book Rhizoctonia Solani Biology and Pathology written by J. R. Parmeter and published by Univ of California Press. This book was released on 1970-01-01 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rhizoctomia solani: the organism. Rhizoctonia solani: the saprophyte. Rhizoctonia solani: the pathogen.
Download or read book Recent Advances in the Diagnosis and Management of Plant Diseases written by L.P. Awasthi and published by Springer. This book was released on 2015-11-19 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a compilation of the most challenging and significant chapters on the diagnosis and management of important bacterial, fungal, viral, viroid, phytoplasma, non parasitic diseases and various physiological disorders, in various crops. The chapters have been contributed by eminent plant pathologists, having wide experience of teaching and research on various crops with different types of diseases, which cause great economic losses. The book would be very useful for students, teachers and researchers of plant pathology. This book highlights recent advances made in the development of new types of resistance in host plants and alternative strategies for managing plant diseases to improve food quality and reduce the negative public health impact associated with plant diseases. Having entered into 21st century advancements in the Diagnosis of Plant Pathogens and Plant Disease Management need to be closely examined and adequately applied, so that newer challenges facing plant pathology could be adequately addressed in attaining food security for the growing population. Substantial advancements have been made in terms of expanding knowledge base of the biology of plant-microbial interactions, disease management strategies and application and practice of Plant Pathology. Application of molecular biology in Plant Pathology has greatly improved our ability to detect plant pathogens and in increasing our understanding, their ecology and epidemiology. Similarly, new technologies and resources have been evolved for the development of sustainable crop protection systems by different control strategies against various pests and pathogens that are important components of the integrated pest management programme. Natural products and chemical compounds discovered as a result of basic research and molecular mechanisms of pathogenesis have led to the development of “biorational” pesticides. Biological control has been found to be the most significant approach to plant health management during the twentieth century and promises using modern biotechnology, to be even more significant in the twenty-first century.
Download or read book Rice Genetics V written by Darshan S. Brar and published by World Scientific. This book was released on 2007 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is a collection of the papers presented at the Fifth IRGS in 2005. It reports the latest developments in the field and includes research on breeding, mapping of genes and quantitative trait loci, identification and cloning of cndidate genesfor biotic and abiotic stresses, gene expression, as well as genomic databases and mutant induction for functional genomics
Download or read book Plant Diseases Caused by Dickeya and Pectobacterium Species written by Frédérique Van Gijsegem and published by Springer Nature. This book was released on 2021-01-04 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a detailed review of many different aspects of pathogens, from the effects of single base pair mutations to large-scale control options, bringing into a single volume over 100 years of findings from thousands of researchers worldwide. Diseases caused by soft rot Pectobacteriaceae (SRP) are a major cause of loss to crop, vegetables and ornamental plants worldwide, and have been found on all continents except Antarctica. While different aspects of the SRP have appeared in other books on plant disease, no book, until now, has been dedicated solely to them.
Download or read book Molecular Aspects of Plant Pathogen Interaction written by Archana Singh and published by Springer. This book was released on 2018-02-15 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book offers an integrated overview of plant–pathogen interactions. It discusses all the steps in the pathway, from the microbe–host-cell interface and the plant’s recognition of the microbe to the plant’s defense response and biochemical alterations to achieve tolerance / resistance. It also sheds light on the classes of pathogens (bacteria, fungus and viruses); effector molecules, such as PAMPs; receptor molecules like PRRs and NBS-LRR proteins; signaling components like MAPKs; regulatory molecules, such as phytohormones and miRNA; transcription factors, such as WRKY; defense-related proteins such as PR-proteins; and defensive metabolites like secondary metabolites. In addition, it examines the role of post-genomics, high-throughput technology (transcriptomics and proteomics) in studying pathogen outbreaks causing crop losses in a number of plants. Providing a comprehensive picture of plant-pathogen interaction, the updated information included in this book is valuable for all those involved in crop improvement.
Download or read book Genomics and Breeding for Climate Resilient Crops written by Chittaranjan Kole and published by Springer Science & Business Media. This book was released on 2013-06-18 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate change is expected to have a drastic impact on agronomic conditions including temperature, precipitation, soil nutrients, and the incidence of disease pests, to name a few. To face this looming threat, significant progress in developing new breeding strategies has been made over the last few decades. The first volume of Genomics and Breeding for Climate-Resilient Crops presents the basic concepts and strategies for developing climate-resilient crop varieties. Topics covered include: conservation, evaluation and utilization of biodiversity; identification of traits, genes and crops of the future; genomic and molecular tools; genetic engineering; participatory and evolutionary breeding; bioinformatics tools to support breeding; funding and networking support; and intellectual property, regulatory issues, social and political dimensions.
Download or read book Rainfed Lowland Rice Improvement written by David J. Mackill and published by Int. Rice Res. Inst.. This book was released on 1996 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: What is rainfed lowland rice? The rainfed lowland ecosystem; The cultivars; Agronomic traits; Growth duration; Drought resistance; Submergence tolerance; Cold tolerance; Adverse soils telerance; Disease and insect resistance; Grain quality; Selecting parents and making crosses; Managing segregating generations; Evaluating advanced breeding lines; Releasing varieties.
Download or read book Plant Signaling Molecules written by M. Iqbal R. Khan and published by Woodhead Publishing. This book was released on 2019-03-15 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plant Signaling Molecule: Role and Regulation under Stressful Environments explores tolerance mechanisms mediated by signaling molecules in plants for achieving sustainability under changing environmental conditions. Including a wide range of potential molecules, from primary to secondary metabolites, the book presents the status and future prospects of the role and regulation of signaling molecules at physiological, biochemical, molecular and structural level under abiotic stress tolerance. This book is designed to enhance the mechanistic understanding of signaling molecules and will be an important resource for plant biologists in developing stress tolerant crops to achieve sustainability under changing environmental conditions. - Focuses on plant biology under stress conditions - Provides a compendium of knowledge related to plant adaptation, physiology, biochemistry and molecular responses - Identifies treatments that enhance plant tolerance to abiotic stresses - Illustrates specific physiological pathways that are considered key points for plant adaptation or tolerance to abiotic stresses
Download or read book Aromatic Rices written by and published by Int. Rice Res. Inst.. This book was released on 2000 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Disease Resistance in Fruit written by Greg I. Johnson and published by . This book was released on 1998 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
