Download or read book Rice Blast Disease in the U S and Africa written by Felix Rotich and published by . This book was released on 2015 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rice blast caused by Magnaporthe oryzae (= Pyricularia oryzae) B. Couch, is a leading disease of rice. Magnaporthe oryzae exhibits a high degree of diversity. The diversity of isolates of M. oryzae from Africa and the U.S. were examined using vegetative compatibility and virulence phenotyping as well as determination of variation in the avirulence gene AVRPiz-t in isolates from Africa. Also, evaluation of blast resistance genes in the interspecific rice germplasm "New Rice for Africa" NERICA was done using F2 progeny of the cross of U.S. susceptible cultivar M204 and NERICA 12. The U.S. isolates were in three vegetative compatibility groups (VCGs), whereas isolates from Africa were in one to four VCGs that were unique to each country. Among isolates from the U.S, four pathotypes were distinguished based on differentials with the CO39 genetic background whereas 10 were distinguished based on the differentials with the LTH background. The R gene Pi9 was the most effective against isolates from both Africa and the U.S. Also, interspecific rice cultivars were highly resistant against isolates from both the U.S. and Africa. No single genotype or R gene was effective against all isolates from both Africa and the U.S. Blast control in the U.S could be achieved by introgression of Pi9 and Pi11 into rice cultivars. In West Africa, blast control could be achieved by introgressing Pi9, Pita2 and Pik-m into the rice cultivar F6-36. Alternatively, Pi9, Pik-s and Pik-m, could be introgressed into the rice cultivar FKR62N. For blast control in East Africa, one could introgress Pi9 into NERICA 12 or Pi9 and Piz-5 into NERICA 2. Variation in 10 of the 70 open reading frame (ORF) sequences of AVRPiz-t examined were observed. From the ORF sequences eleven haplotypes were observed with one haplotype comprising 86% of both virulent and avirulent isolates. Six virulent isolates had single nucleotide substitutions, insertions or deletions which altered the amino acid sequences of the ORF that could have caused isolates to be virulent. Based on PCR markers, two R genes, Pib and Pita2 were found in NERICA 12, but NERICA 12 could possibly contain other R genes.
Download or read book Rice Blast Disease written by Robert S. Zeigler and published by Int. Rice Res. Inst.. This book was released on 1994 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pathogen biology. Cell biology of pathogenesis. Signalling systems and gene expression regulating appressorium formation in magnaporthe grisea. Genetic regulation of sporulation in the rice blast fungus. Genetic interactions in magnaporthe grisea that affect cultivar specific avirulence/virulence on rice. Genomic structure and variability in pyricularia grisea. Molecular genetic approach to the study of cultivar specificity in the rice blast fungus. Avirulence genes and mechanisms of genetic instability in the rice blast fungus. Host plant resistance. International collaboration on breeding for resistance to rice blast. Present knowledge of rice resistance genetics and strategies for magnaporthe grisea pathogenicity and avirulence gene analysis. Mapping of blast resistance genes in rice. Molecular genetic analysis fo the rice bacterial blight resistance locus, Xa21. Current status for gene transfer into rice utilizing variety-independent delivery systems. Pathogen population dynamics and utilization of host plant resistance. Virulencecharacteristics of genetic families of pyricularia grisea in Colombia. Race-specific and rate-reducing resistance to rice blast in US rice cultivars. A strategy for accumulating genes for partial resistance to blast disease in rice within a conventional breeding program. Lineage exclusion: a proposal for linking blast population analysis to resistance breeding. Use of host genetic diversity to control cereal diseases: implications for rice blast. Figs, wasps, nematodes and sitting ducks: rice blast, from the outside looking in. Epidemiology, loss assessment, and management. The economic impact of rice blast disease in China. Current rice blast epidemics and their management in Thailand. Rice blast in west Africa: its nature and control. Understanding and modeling leaf blast effects on crop physiology and yield. Methodology for quantifying rice yield effects of blast. The epidemiological basis for blast management. Using simulation models to explore better strategies for the management of blast disease in temperate rice pathosystems. Blast management in high input, high yield potential, temperate rice ecosystems. Practical approaches to rice blast management in tropical monsoon ecosystems, with special reference to Bangladesh. Rice breeding programs, blast epidemics and blast management in the United States. Strategies for the discovery of rice blast fungicides. Biological control of rice leaf blast. Farmers' perspectives. Crop-livestock interactions: implications for crop improvement in sustainable agriculture. Assessing indigenous and traditional knowledge in farming systems. Rice, reason, and resistance: a comparative study of farmers' vs. Scientists' perception and strategies.
Download or read book Wheat Blast written by Sudheer Kumar and published by CRC Press. This book was released on 2020-04-09 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wheat Blast provides systematic and practical information on wheat blast pathology, summarises research progress and discusses future perspectives based on current understanding of the existing issues. The book explores advance technologies that may help in deciding the path for future research and development for better strategies and techniques to manage the wheat blast disease. It equips readers with basic and applied understanding on the identification of disease, its distribution and chances of further spread in new areas, its potential to cause yield losses to wheat, the conditions that favour disease development, disease prediction modelling, resistance breeding methods and management strategies against wheat blast. Features: Provides comprehensive information on wheat blast pathogen and its management under a single umbrella Covers disease identification and diagnostics which will be helpful to check introduction in new areas Discusses methods and protocol to study the different aspects of the disease such as diagnostics, variability, resistance screening, epiphytotic creation etc. Gives deep insight on the past, present and future outlook of wheat blast research progress This book’s chapters are contributed by experts and pioneers in their respective fields and it provides comprehensive insight with updated findings on wheat blast research. It serves as a valuable reference for researchers, policy makers, students, teachers, farmers, seed growers, traders, and other stakeholders dealing with wheat.
Download or read book Advances in Genetics Genomics and Control of Rice Blast Disease written by Xiaofan Wang and published by Springer Science & Business Media. This book was released on 2009-03-01 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rice blast, caused by the fungal pathogen Magnaporthe grisea, is one of the most destructive rice diseases worldwide and destroys enough rice to feed more than 60 million people annually. Due to high variability of the fungal population in the field, frequent loss of resistance of newly-released rice cultivars is a major restraint in sustainable rice production. In the last few years, significant progress has been made in understanding the defense mechanism of rice and pathogenicity of the fungus. The rice blast system has become a model pathosystem for understanding the molecular basis of plant-fungal interactions due to the availability of both genomes of rice and M. grisea and a large collection of genetic resources. This book provides a complete review of the recent progress and achievements on genetic, genomic and disease control of the disease. Most of the chapters were presented at the 4th International Rice Blast Conference held on October 9-14, 2007 in Changsha, China. This book is a valuable reference not only for plant pathologists and breeders working on rice blast but also for those working on other pathysystems in crop plants.
Download or read book Rice written by Wengui Yan and published by BoD – Books on Demand. This book was released on 2014-04-23 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rice is a staple food for half of the worlds population mostly in Asia. Productivity of rice has largely been improved since the Green Revolution in 1960s. Further improvement of rice yield is necessary to keep pace with population growth, which is a challenging task for breeders. This book, Rice - Germplasm, Genetics and Improvement, as its name implies, comprehensively reviews current knowledge in germplasm exploration, genetic basis of complex traits, and molecular breeding strategies in rice. In the germplasm part, we highlight the application of wild rice in rice breeding. In the genetics part, most of the complex traits related with yield, disease, quality have been covered. In the improvement part, Chinese experiences in hybrid rice breeding have been summarized together with many molecular breeding practices scattering in different chapters.
Download or read book Molecular Analysis of Host Resistance and Pathogenicity of Rice Blast in East Africa written by Emmanuel M. Mgonja and published by . This book was released on 2016 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: Africa is endowed with rich rice genetic resources that can be utilized to boost rice production and productivity on the continent. Detailed understanding of rice genetic resources and diversity of germplasm collections is significantly important for the management and sustainable use of genetic stocks and rice breeding programs. One of the major constraints to rice production in Africa is rice blast disease, caused by the fungal pathogen Magnaporthe oryzae. Deployment of host resistance combined with the use of good cultural practices remains the most promising approach for blast disease management. In this dissertation, findings from genotyping-by-sequencing (GBS) based diversity analyses, association mapping of blast resistance loci and screening for blast resistant cultivars are presented. Genetic diversity analysis of 190 African rice cultivars using 184K single nucleotide polymorphisms (SNPs) generated by GBS, revealed the existence of three major groups in the African rice population. The grouping was independent of ecologies, and varieties in different subspecies were mixed in all the three clusters. The possible explanation to such trend could be due to misclassification of these cultivars or possible admixtures that could have happened in handling seeds or may be a result of natural hybridization between O. sativa and O. glaberrima. Misclassifications of some rice cultivars were discovered using phylogenetic and PCR analyses. Association mapping using the SNP data from 190 African cultivars and 162 Rice Diversity panel 1 (RDP1) cultivars and the inoculation data of these rice cultivars with a total of nine African M. oryzae isolates identified 56 loci that are significantly associated with blast resistance. Moreover, we established the linkage of two major loci on chromosome 1 and 12 to two resistance (R) genes (Pish and Pita), respectively, by using PCR analysis. A total of 30 highly blast resistant rice cultivars to the nine isolates were obtained. Further screening of these cultivars using seven West African M. oryzae isolates showed that 50 percent of them conferred a high level of resistance. These findings demonstrate that effectiveness of GBS on population studies and the power of association mapping for quick identification of rice blast R genes and quantitative trait loci (QTLs). The identified loci are effective against many African M. oryzae isolates and could be valuable in blast resistance breeding programs in Africa.
Download or read book Lost Crops of Africa written by National Research Council and published by National Academies Press. This book was released on 1996-02-14 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scenes of starvation have drawn the world's attention to Africa's agricultural and environmental crisis. Some observers question whether this continent can ever hope to feed its growing population. Yet there is an overlooked food resource in sub-Saharan Africa that has vast potential: native food plants. When experts were asked to nominate African food plants for inclusion in a new book, a list of 30 species grew quickly to hundreds. All in all, Africa has more than 2,000 native grains and fruitsâ€""lost" species due for rediscovery and exploitation. This volume focuses on native cereals, including: African rice, reserved until recently as a luxury food for religious rituals. Finger millet, neglected internationally although it is a staple for millions. Fonio (acha), probably the oldest African cereal and sometimes called "hungry rice." Pearl millet, a widely used grain that still holds great untapped potential. Sorghum, with prospects for making the twenty-first century the "century of sorghum." Tef, in many ways ideal but only now enjoying budding commercial production. Other cultivated and wild grains. This readable and engaging book dispels myths, often based on Western bias, about the nutritional value, flavor, and yield of these African grains. Designed as a tool for economic development, the volume is organized with increasing levels of detail to meet the needs of both lay and professional readers. The authors present the available information on where and how each grain is grown, harvested, and processed, and they list its benefits and limitations as a food source. The authors describe "next steps" for increasing the use of each grain, outline research needs, and address issues in building commercial production. Sidebars cover such interesting points as the potential use of gene mapping and other "high-tech" agricultural techniques on these grains. This fact-filled volume will be of great interest to agricultural experts, entrepreneurs, researchers, and individuals concerned about restoring food production, environmental health, and economic opportunity in sub-Saharan Africa. Selection, Newbridge Garden Book Club
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 Major Fungal Diseases of Rice written by S. Sreenivasaprasad and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Major Fungal Diseases of Rice: Recent Advances provides a comprehensive overview of latest research in rice fungal pathology. There are 25 chapters dealing with the blast, sheath blight, sheath rot, brown spot and scald diseases of rice as well as some broader topics. The book covers recent progress in a number of key fundamental aspects such as pathogenicity, pathogen diversity, molecular characterisation, gene cloning, genetics of host resistance and host-pathogen interactions. It also presents the current status and perspectives in strategic and applied areas such as epidemiology, resistance breeding, biological control, induced resistance, seed-borne diseases and quarantine issues and disease management strategies. This book is essential for rice researchers, pathologists and breeders and will also be suitable for cereal and plant pathologists in general, as there is an extensive coverage of recent research advances in rice blast, a model system in plant pathology.
Download or read book Realizing Africa s Rice Promise written by Marco C S Wopereis and published by CABI. This book was released on 2013-10-16 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: At a time when Africa's food security stands threatened, Realizing Africa's Rice Promise provides a comprehensive overview of state-of-the-art research and recommendations for dealing with future challenges. With contributions from the key scientists working on rice in Africa, this volume addresses policy, genetic diversity and improvement, sustainable productivity enhancement, innovations and value chains. The book is useful for researchers, policy makers, agricultural ministries, donors, regional and sub-regional organizations, non-governmental development organizations and universities.
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 A Handbook of Rice Seedborne Fungi written by T. W. Mew and published by Int. Rice Res. Inst.. This book was released on 2002 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seed health testing assures the safe movement of seed of different crops, for research or trade. It is premised on the hypothesis that many harmful organisms are carried by and moved with the seed which have the potential to harm crops. This text provides details of rice seed-borne fungi.
Download or read book A Manual of Rice Seed Health Testing written by T. W. Mew and published by Int. Rice Res. Inst.. This book was released on 1994 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rice seed health and quarantine; The rice plant and its environment; Equipment; Samples and sampling; dry seed inspection; Fungi; Bacteria; Nematodes; Viruses and mycoplasmalike organisms; Field inspection; Seed treatment; Weed seed; Insect pests; Fungal pathogens; Bacterial pathogens; Nematode pest; Organisms causing grain discoloration and damage.
Download or read book An Overview of Upland Rice Research written by and published by Int. Rice Res. Inst.. This book was released on 1984 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Emerging Plant Diseases and Global Food Security written by Jean Beagle Ristaino and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biosecurity and Bioterrorism written by Jeffrey Ryan and published by Butterworth-Heinemann. This book was released on 2016-02-18 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biosecurity and Bioterrorism, Second Edition, takes a holistic approach to biosecurity, with coverage of pathogens, prevention, and response methodology. It addresses these hazards in the context of vulnerability assessments and the planning strategies government and industry can use to prepare for and respond to such events. The book is organized into four thematic sections: Part I provides a conceptual understanding of biowarfare, bioterrorism and the laws we have to counteract this; Part II investigates known bioagents and the threat from emerging diseases; Part III focuses on agricultural terrorism and food security; and Part IV outlines international, US, and local initiatives for biodefense and biosecurity. Case studies illustrate biodefense against both intentional terrorism and natural outbreaks. - Covers emerging threats of pandemic influenza, antibiotic resistant strains of bacterial pathogens, and severe respiratory diseases caused by novel viruses - Offers increased international coverage, including initiatives to counter biological weapons and threats, and food security - Updated throughout with latest protocols for dealing with biological threats and new case studies - Includes online instructor ancillaries - PowerPoint lecture slides, test questions, and an instructor manual, for increased classroom functionality
Download or read book Rice in Human Nutrition written by Bienvenido O. Juliano and published by Int. Rice Res. Inst.. This book was released on 1993 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: On title page & cover: International Rice Research Institute
