Download or read book Development of Models to Predict Fusarium Head Blight Disease and Deoxynivalenol in Wheat and Genetic Causes for Chemotype Diversity and Shifting of Fusarium Graminearum in Manitoba written by Xiaowei Guo and published by . This book was released on 2008 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Continuing Battle Between Wheat and Fusarium Graminearum written by Amarasinghe Chami and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fusarium head blight (FHB) continues to threaten the economic sustainability of wheat and barley production in Canada and worldwide. The overall goal of this thesis is to expand our current knowledge of the FHB pathogen, Fusarium graminearum and its trichothecene chemotype diversity. Continuous monitoring of trichothecene chemotypes may well inform on the potential risk and the type of Fusarium populations present in a given region. Fusarium populations in Winnipeg and Carman, Manitoba were examined using chemotype as a marker in the field. Rapid expansion of the 3-acetyldeoxynivalenol (3-ADON) chemotype was observed in Winnipeg and Carman. 3-ADON chemotype is consistently found at high frequencies over the previously common 15-acetyldeoxynivalenol (15-ADON) chemotype, suggesting that the shift in pathogen populations is continuing. This study provides the first evidence on the presence of nivalenol (NIV) producing F. cerealis strains in winter wheat in Manitoba, Canada. Therefore, discovery of NIV producing F. cerealis in wheat poses a serious concern for the wheat industry in Canada. Phylogenetic, chemotypic, phenotypic, and pathogenic abilities of 150 strains of F. graminearum species complex (FGSC) from eight countries were investigated. Type and amount of trichothecenes produced by a strain are key factors in determining the level of aggressiveness of that strain regardless of its species origin. The sequence variations of TRI8 gene in different species in the FGSC were examined as Fusarium species may produce different types of trichothecenes depending on differences in the core trichothecene (TRI) cluster genes. The TRI8 haplotypes did group according to chemotype rather than by species, indicating that 3-ADON, 15-ADON and NIV chemotypes have a single evolutionary origin. Comparison of TRI gene expression demonstrated that accumulation of TRI transcripts was higher in 3-ADON producing strains compared to 15-ADON and NIV strains. The presence of masked mycotoxins deoxynivalenol-3-glucoside (D3G) in food and feed is an increasing concern. Canadian spring wheat cultivars inoculated with different chemotypes produce D3G upon Fusarium infection and moderately resistant/intermediate cultivars showed higher D3G/DON ratio compared to susceptible cultivars.
Download or read book Fusarium Head Blight in Canadian Winter Wheat written by Harwinder Sidhu and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fusarium Head Blight (FHB) is a devastating disease of Wheat (Triticum aestivum L.) caused primarily by Fusarium graminearum Schwabe in Canada. Wheat FHB results in yield and produce quality losses. The clearest symptoms of FHB are premature bleaching of spikelets in the field, and fusarium damaged kernels in the harvested seed. Insufficient and costly disease control strategies make breeding for FHB resistance in wheat an ideal choice. There is a lack of FHB resistance sources in the Canadian wheat germplasm and Genome Wide Association Studies (GWAS) can be utilized to identify such sources. Furthermore, as no Quantitative Trait Loci (QTL) provides absolute resistance to FHB, identification of novel sources of resistance is desired. Genomic Selection (GS) has great potential in crop improvement, specifically for quantitative traits. A diversity panel that represents the genetic diversity of the Canadian, i.e., high latitude North American winter wheat was assembled for this thesis and the genetic diversity, population structure, and linkage disequilibrium of the germplasm was studied. To identify QTL associated with FHB, a GWAS study was conducted using the phenotypic data collected at three locations over two years. For understanding the role of number of genotypic markers, population structure, and choice of model in trait prediction modelling, a GS study was conducted. The Canadian Winter Wheat Diversity Panel is a diverse collection of winter wheat capturing diversity both in time and geography from Canada. The panel comprises of seven subpopulations with different LD, allele frequencies, and genetic diversity parameters. Multiple QTL associated with FHB related traits were identified on 13 chromosomes which may harbor genes involved in plant defense and stress response mechanisms. For FHB resistance improvement, the GS study demonstrated that the modelling parameters can be determined based upon the genotypic information available. Deoxynivalenol contamination was one of the traits with the highest prediction accuracy. GS can account for minor effect QTL, which is beneficial when breeding for quantitative traits. FHB resistant varieties are needed for an effective and economical disease control strategy in wheat and GS can complement current breeding efforts to develop FHB resistant wheat varieties.
Download or read book Modeling the Effects of Fusarium Head Blight on Wheat Grain Yield and Quality and Developing Cost effective Strategies for Minimizing Losses written by Jorge David Salgado and published by . This book was released on 2014 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Fusarium head blight (FHB) or head scab, caused predominantly by Fusarium graminearum in North America, is a disease of economic importance in wheat (Triticum aestivum L.) in Ohio and other parts of the world. FHB reduces grain yield (YLD) and test weight (TW; weight per unit volume), and causes Fusarium damaged kernel (FDK) and deoxynivalenol (DON) mycotoxin contamination of grain. Data were collected from several field experiments conducted in Ohio to i) model FHB/YLD and FHB/TW relationships as influenced by cultivar and the severity of Stagonospora nodorum leaf blotch (SLB, another disease of economic importance in Ohio); ii) develop integrated management programs to minimize losses caused by FHB, and iii) conduct economic analyses of FHB management programs. Depending on the objective of the study, plots of FHB susceptible and moderately resistant cultivars were planted and inoculated with different spore concentrations of F. graminearum and S. nodorum to generate a range of FHB and SLB intensities and corresponding YLD and TW values, treated with a fungicide, and harvested with different combine harvester settings. Linear mixed model variance and covariance analyses and random-effects meta-analyses were used to quantify FHB index (IND)/YLD and IND/TW relationships, and to determine the effects of cultivar, fungicide, and grain harvesting strategy (modification to combine settings to remove small and lightweight kernel) on IND, FDK, DON, YLD, and TW. The final models for both relationships were of the form y=a+b(IND). YLD and TW decreased as IND increased, with the rates of reduction ranging from -54 to -46 kg ha-1 %-1 for YLD and -3.2 to -2.3 kg m-3 %-1 for TW. Neither cultivar nor SLB affected the IND/YLD relationship, but SLB affected the height of the IND/TW regression lines, and cultivar affected the rate of TW reduction per unit increase in IND. The level of IND at which a 1 MT ha-1 yield loss was predicted to occur ranged from 19 to 22%, whereas a 100 kg m-3 reduction in TW was predicted to occur between 31 and 44% IND. Several FHB management programs were developed. The greatest percent reduction in FDK (25 to 62%) and DON (33 to 52%) and increase in YLD (18 to 26%), relative to the reference program (without any management intervention), was observed for programs that included moderate resistance and fungicide treatment. The greatest percent increase in TW (8 to 10%) relative to the reference was observed when modified combine setting was integrated with resistance and/or fungicide. Overall, the most effective management programs all included fungicide treatment, two included moderate resistance, and two modified combine setting. Relative to the reference, these programs resulted in 30 to 51% reduction in total estimated price discount, $127 to 312 ha-1 increase in gross cash income, and economic benefits ranging from $31 to 272 ha-1, depending on the level of IND (5 to 15%), grain price ($118 to 276 MT-1), and fungicide application cost ($40 to 96 ha-1). Results from these studies will be used in more general models to evaluate the economics of FHB/DON management strategies.
Download or read book Factors Affecting Fusarium Head Blight Development and Trichothecene Accumulation in Fusarium Infected Wheat Heads written by Pravin Gautam and published by GRIN Verlag. This book was released on 2011-08 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Doctoral Thesis / Dissertation from the year 2010 in the subject Biology - Botany, grade: none, University of Minnesota - Twin Cities, language: English, abstract: Fusarium head blight caused by Fusarium graminearum Schwabe is an economically important disease as it results in yield and quality losses of infected grain and the accumulation of mycotoxins produced by the invading fungus. Though it is well established that moisture around the anthesis period promotes FHB development and trichothecene accumulation, the role of moisture from anthesis to harvest has been largely overlooked. The objective of this study was to examine the influence of environmental factors, especially moisture, host resistance, and pathogen variation on infection, FHB disease development and mycotoxin production and accumulation in planta. The split-split-plot Field experiments were conducted in 2006-2008. Main plots were the duration of mist-irrigation after inoculation. Three wheat cultivars used as sub-plots were Alsen, 2375 and Wheaton. Sub-sub-plots were F. graminearum isolates. Plots were inoculated twice, at anthesis. FHB severity was assessed 21 dai. Visually scabby kernels, deoxynivalenol, 15-acetyldeoxynivalenol, 3-acetyldeoxynivalenol and nivalenol were determined on grain harvested at maturity. Additionally, in 2007 and 2008, whole heads were sampled at 0, 7, 11, 14, 21, 28 and 41 dai analyzed for mycotoxins. Severity, VSK and the DON concentration of mature grain, were significantly higher in the susceptible wheat cultivar Wheaton than in the other two cultivars examined. Although FHB severities were not significantly different in plots receiving different durations of mist irrigation, VSK were significantly lower in the treatments receiving the least amount of mist-irrigation than for treatments receiving mist-irrigation for longer periods, suggesting that extended periods of moisture promote disease development. DON was however significantly lower in the longest misting trea
Download or read book Deoxynivalenol and Nivalenol in Pathogenesis of Fusarium Head Light in Wheat written by Jane Gacheri Muriuki and published by . This book was released on 2001 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fusarium Head Blight of Wheat written by Chami Chathurangi Amarasinghe and published by . This book was released on 2011 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: DON -- 3-ADON -- 15-ADON.
Download or read book Epidemiology and Variability of Disease and Deoxynivalenol in Fusarium Head Blight of Wheat in Ohio written by Kylea J. Odenbach and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Fusarium graminearum Schwabe (teleomorph Gibberella zeae (Schwein.) Petch), is the causal agent of Fusarium head blight (FHB), a fungal disease of wheat and other small grain. This fungus produces a trichothecene mycotoxin, deoxynivalenol (DON), which accumulates in infected grain. The United States Food and Drug Administration has issued a 2 ppm advisory limit for DON in unprocessed grain intended for human consumption. In this study, the effect of host resistance, growth stage at infection, and inoculum density, as well as the interactions of these factors, were evaluated on disease measures and DON content of grain under different environmental conditions. A second study, overlaid on the first, evaluated the same effects on DON and F. graminearum colonization of grain from wheat spikes asymptomatic for FHB. The experimental design was a randomized complete block with a split-split-split plot treatment structure, with planting date (PD) as the whole plot, wheat cultivar (CV) as the sub-plot, infection time (IT) as the sub-sub plot, and inoculum density (ID) as the sub-sub-sub plot. Main effects of CV, IT, and ID were significant in both years for DON and visual measures of disease. The greatest DON levels for the two years were seen when temperatures were cool (
Download or read book Fusarium Head Blight of Wheat and Barley written by Kurt J. Leonard and published by American Phytopathological Society. This book was released on 2003 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides a comprehensive record of current knowledge on the nature of Fusarium head blight, the damage it causes, and current research on how to control it. The book begins with a historical account of Fusarium head blight epidemics that gives context to recent attempts to control epidemics in wheat and barley. A review of pathogen taxonomy and population biology helps scientists to see relationships among head blight pathogens and other Fusarium species. The information on epidemiology included in this review also provides an understanding of the weather conditions and cultural practices that promote explosive epidemics. New information on infection processes will lead the reader to a better understanding of how to breed for resistance in wheat and barley.
Download or read book Future Challenges in Crop Protection Against Fungal Pathogens written by Aakash Goyal and published by Springer. This book was released on 2014-09-06 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the issues and challenges of crop pathogens and plant protection. Composed of the latest knowledge in plant pathology, the book covers topics such as fungal diseases of the groundnut, plant growth promoting rhizobacteria, plant pathogenic fungi in the genomics era, the increased virulence of wheat rusts and oat fungal diseases. Written by experienced and internationally recognized scientists in the field, Future Challenges in Crop Protection Against Fungal Pathogens is a concise yet comprehensive resource valuable for both novice as well as experienced plant scientists and researchers.
Download or read book Molecular Identification of Fungi written by Youssuf Gherbawy and published by Springer Science & Business Media. This book was released on 2010-03-03 with total page 511 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fungi enjoy great popularity in pharmaceutical, agricultural, and biotechnological applications. Recent advances in the decipherment of whole fungal genomes promise an acceleration of these trends. This timely book links scientists from different parts of the world who are interested in the molecular identification of fungi combined with the exploration of the fungal biodiversity in different ecosystems. It provides a compendium for scientists who rely on a rapid and reliable detection of fungal specimens in environmental as well as clinical resources in order to ensure the benefit of industrial and clinical applications. Chapters focus on the opportunities and limits of the molecular marker-mediated identification of fungi. Various methods, procedures and strategies are outlined. Furthermore, the book offers an update of the current progress in the development of fungal molecular techniques, and draws attention to potential and associated problems, as well as integrating theory and practice.
Download or read book Mycotoxin Reduction in Grain Chains written by John F. Leslie and published by John Wiley & Sons. This book was released on 2014-04-29 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cereal grain safety from farm to table Mycotoxin Reduction in Grain Chains examines the ways in which food producers, inspectors, and processors can keep our food supply safe. Providing guidance on identification, eradication, and prevention at each stop on the "grain chain, this book is an invaluable resource for anyone who works with cereal grains. Discussions include breeding and crop management, chemical control, contamination prediction, and more for maize, wheat, sorghum, rice, and other major grains. Relevant and practical in the field, the lab, and on the production floor, this book features critical guidance for every point from farm to table.
Download or read book Advancing Frontiers in Mycology Mycotechnology written by Tulasi Satyanarayana and published by Springer. This book was released on 2020-11-01 with total page 675 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides an introduction to the basics of fungi, discussing various types ranging from edible mushrooms to Neurospora – a model system for genetics and epigenetics. After addressing the classification and biodiversity of fungi, and fungi in different ecological niches, it describes the latest applications of fungi, their role in sustainable environments and in alleviating stress in plants, as well as their role in causing plant and animal diseases. Further chapters explore the advances in fungal interactions research and their implications for various systems, and discuss plant-pathogen interactions. The book also features a section on bioprospecting, and is an extremely interesting and informative read for anybody involved in the field of mycology, microbiology and biotechnology teaching and research.
Download or read book Mycotoxins in Food Feed and Bioweapons written by Mahendra Rai and published by Springer Science & Business Media. This book was released on 2009-10-26 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mycotoxins are made by different biosynthetic pathways, and they have an extremely wide range of pharmacological effects. This book will update readers on several cutting-edge aspects of mycotoxin research, including topics such as: new analytical methods for detection; the adoption of an ancient Mexican process for detoxification of aflatoxins; mycotoxin management in Ireland, Lithuania and South America; mycotoxin reduction through plant breeding and integrated management practices; and natural aflatoxin inhibitors from medicinal plants. Further contributions examine ochratoxins, selected trichothecenes, zearalenone, and aflatoxin-like gene clusters, as well as sclerotial development in Aspergillus flavus and A. parasiticus. Of particular interest are the chapters on the potential use of mycotoxins as bioweapons. This book will stimulate new thinking on the need to develop therapeutic as well as preventative interventions to reduce the toxicological threat of mycotoxins.
Download or read book Fusarium written by Łukasz Stępień and published by MDPI. This book was released on 2020-11-18 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been over 200 years since Fusarium pathogens were described for the first time, and they are still in the spotlight of researchers worldwide, mostly due to the mycotoxigenic abilities and the subsequent introduction of harmful metabolites into the food chain. The accelerating climatic changes are resulting in pathogen population and chemotype shifts all around the world, thus increasing the demand for continuous studies of factors that affect the virulence, disease severity and mycotoxin accumulation in plant tissues. This Special Issue summarizes recent advances in the field of Fusarium genetics, biology and toxicology.
Download or read book Plant Diseases and Food Security in the 21st Century written by Peter Scott and published by Springer Nature. This book was released on 2021-05-22 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of the global population of more than 7 billion people, some 800 million do not have enough to eat today. By 2050, the population is expected to exceed 9 billion. It has been estimated that some 15% of food production is lost to plant diseases; in developing countries losses may be much higher. Historically, plant diseases have had catastrophic impact on food production. For example: potato blight caused the Irish famine in 1845; brown spot of rice caused the Great Bengal Famine of 1943; southern corn leaf blight caused a devastating epidemic on the US corn crop in 1970. Food security is threatened by an ongoing sequence of plant diseases, some persistent for decades or centuries, others more opportunistic. Wheat blast and banana xanthomonas wilt are two contrasting examples of many that currently threaten food production. Other emerging diseases will follow. The proposed title aims to provide a synthesis of expert knowledge to address this central challenge to food security for the 21st century. Chapters [5] and [11] are available open access under a Creative Commons Attribution 4.0 International License via link.springer.com.
Download or read book Fusarium Species written by Abraham Z. Joffe and published by Wiley-Interscience. This book was released on 1986-08-14 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: This clear, in-depth guide describes the Fusarium genus and its toxins--a widespread group of plant pathogens associated with disease and sometimes death in humans and livestock and implicated as the active agent in ``yellow rain.'' Noted authority Abraham Joffe presents new and original research into the biology of the Fusarium and the chemistry, biochemical and toxicological properties of their toxins.
