Download or read book The Nature of Fusarium Wilt Disease Resistance in Tomato written by Erik Leslie Stromberg and published by . This book was released on 1977 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bioassays of acetone extracts from xylem tissue in tomato stems and corresponding reductions in Fusarium oxysporum f.sp. lycopersici race 1 or 2 populations within the stems suggest that fungitoxic materials within the xylem vessels of Bonny Best, Jefferson, and Marglobe tomato cultivars initially kill a portion of the inoculum conidia. In the susceptible host-pathogen combinations, the pathogen eventually grows extensively in the xylem vessels and severe disease symptoms follow closely the proliferation of the pathogen. Acetone extracts from the susceptible Bonny Best cultivar do not become highly fungitoxic until eight or nine days after inoculation when the disease symptoms are already severe. Xylem extracts from the multigenic resistant Marglobe, however, do not become fungitoxic, even 11 days after inoculation with race 1 of the pathogen when the disease symptoms are severe and the Fusarium population is seven times that in Bonny Best-race 1 inoculated plants. In the monogenic resistant Jefferson-race 1 combination, within three to four days after inoculation the xylem extracts become highly fungitoxic, the fungal population within the stem remains low and disease symptoms fail to develop. The xylem extracts from race 1 resistant Jefferson inoculated with race 2 of the pathogen do not become fungitoxic even when disease symptoms are exhibited and the Fusarium population has reached a peak nearly three times that in Bonny Best-race 1 inoculated plants. Conidia of race 2 were as sensitive to the xylem toxicants produced in response to infection by race 1 as were race 1 conidia. The breaking of Fusarium wilt resistance by race 2 of the pathogen may be a result of this race's failure to induce the production or release of fungitoxic materials in the xylem of Jefferson in response to infection and is not due to resistance of race 2 to toxicants in Jefferson. Xylem vessels in stems of Jefferson (race 1 resistant and race 2 susceptible) and Bonny Best (race 1 susceptible) tomato cultivars inoculated with Fusarium oxysporum f.sp. lycopersici race 1 or 2 were examined by scanning electron microscopy. Four days after inoculation of Jefferson with race 1 conidia, the inoculum conidia and resultant hyphae were collapsed, while in the susceptible host-pathogen combinations the conidia and hyphae appeared normal. Vessel elements of both resistant and susceptible host-pathogen combinations had no perforation plates or tyloses capable of trapping conidia or effectively blocking hyphal growth within the vessel elements. Perforation plates are reduced to slightly lipped rims at the ends of vessel elements thereby providing an unrestricted aperature for hyphal growth and conidial movement in the transpiration stream. In the susceptible host-pathogen combinations, mycelial growth often filled vessel lumens, but no sporulation was noted. Frequent lateral spread of the pathogen occurred from one vessel element to adjacent vessel elements through common pits. The infrequent occurrence of tyloses (in less than 1% of vessel elements) and lack of complete occlusion by tyloses in the resistant host-pathogen combination suggest that vascular wilt resistance is not due to physical containment of the pathogen. Collapsed conidia and hyphae in the resistant Jefferson-race 1 combination may indicate that fungitoxic materials suppress the pathogen and lead to resistance.
Download or read book The Nature of Wilt Diseases of Plants written by Carl H. Beckman and published by American Phytopathological Society. This book was released on 1987 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: The production, persistence, and presentation of inoculum. Defense strategies of the plant. Success or failure of the pathogen in penetrating to the vascular system of the host; 2. In colonizing the vascular system. The expressive phase of the disease. Environmental factors in disease development. Control measures. A look toward the future.
Download or read book Fusarium Wilt of Banana written by Randy C. Ploetz and published by American Phytopathological Society. This book was released on 1990 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fusarium wilt of banana: some history and current status of the disease; Importante of fusarium wilt in different banana-growing regions; Taxonomy of fungi in the genus fusarium with emphasis on fusarium oxysporum; Genetic exchange within sexual and asexual populations of the genus fusarium; Molecular genetics of plant pathogenic fusarium oxysporum; Using karyotype variability to investigate the origins and relatednes of isolates of fusarium oxysporum f. sp. cubense; Population biology of fusarium oxysporum f. sp. cubense; Biological control of diseases caused by fusarium oxysporum; Influence of mineral nutrition on fusarium wilt: a proposed mechanism involving cell water relations; Host responses to the pathogen; Banana breeding and fusarium wilt; Breeding bananas and plantains for resistance to fusariu m wilt: the track record; Somaclonal resistance in cavendish banana to fusarium wilt; Baseline tissue and cell culture studies for use in banana improvement schemes.
Download or read book The Nature of Resistance in Tomato and in Cabbage to Vascular Wilt Caused by F u s a r i u m Oxysporum written by Donald Eldon Gardner and published by . This book was released on 1968 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fusarium Mycotoxins written by Anne E. Desjardins and published by American Phytopathological Society. This book was released on 2006 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Also included is a thorough review of the molecular genetics of both trichothecene and fumonisin biosynthesis, presenting more than 15 years of molecular biological research in an accessible form. Part one then reviews the natural occurrence and toxicity of agriculturally important mycotoxins, with historical case studies of suspected mycotoxicoses in humans and animals. These chapters also contain updates on the molecular genetics of additional mycotoxins and the importance of mycotoxins in plant diseases. This useful reference presents concise descriptions of mycotoxin-producing Fusarium species, as defined by the most recent concepts of fungal species biology and evolution. Each species' report includes a risk assessment based on its mycotoxin profile, occurrence in food and feed crops, and association with human and animal mycotoxicoses. Data on species distribution, mycotoxin profiles, and animal toxicity facilitate risk assessment for food and feed safety.
Download or read book Mineral Nutrition and Plant Disease written by Lawrence E. Datnoff and published by . This book was released on 2007 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chemistry of plant nutrients in soil. The physiological role of minerals in the plant. Nitrogen and plant disease. Phosphorus and plant disease. Potassium and plant disease. Calcium and plant disease. Magnesium and plant disease. Sulfur and plant disease. Iron and plant disease. Manganese and plant disease. Zinc and plant disease. Copper and plant disease. Chlorine and plant disease. Molybdenum and plant disease. Boron and plant disease. Nickel and plant disease. Silicon and plant disease. Aluminum and plant disease.
Download or read book Fusarium written by Tulin Askun and published by BoD – Books on Demand. This book was released on 2018-07-25 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fusarium species are ubiquitous environmental fungi and can cause severe invasive infections in plants. They are crop pathogens, and consumption of such infected crops can cause diseases in humans and animals. Furthermore, they act as spoilage organisms in stored products, such as wheat, sorghum, rice, and corn (maize). Fusarium species are mycotoxin producers and contaminate food and grains. Therefore, their eradication and management have economic importance as they can cause enormous economic and agricultural production losses. Despite the fact that the genus Fusarium Link (1809) has been known for over 200 years, new scientific information is being revealed by rapid advancements and breakthrough findings of interdisciplinary studies. This book presents an introductory overview of an update to the scientific knowledge about Fusarium. It discusses various aspects of Fusarium, such as its genetic diversity, root rot incidence and severity, genetic resistance, molecular markers, mycotoxins, diseases caused by Fusarium, and their management and the biological control of these phytopathogens. Furthermore, it also elaborates upon new plant secondary metabolites that are effective against Fusarium and the molecular interaction between Fusarium and the plant.
Download or read book Fusarium written by Paul E. Nelson and published by Penn State University Press. This book was released on 1981 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diseases caused by Fusarium and their control; The fungus Fusarium: ecology; The fungus Fusarium: genetics and cytology; The fungus Fusarium: Physiology and histopathology; The fungus Fusarium: Taxonomy.
Download or read book Legume Crops written by Mirza Hasanuzzaman and published by BoD – Books on Demand. This book was released on 2020-10-21 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a sustainable agricultural system, legume crops are one of the essential components. However, improving the productivity of legume crops and improving their tolerance to adverse environments are essential tasks for plant biologists. This book includes nine comprehensive chapters addressing various aspects of legume crop biology, production and importance. There are several chapters on the adaptation of legumes to an adverse environment. Particular focus is provided on the sustainable production of legume crops under changing environments. This book will be useful for undergraduate and graduate students, teachers, and researchers, particularly from the field of Crop Science, Soil Science, Plant Breeding and Agronomy.
Download or read book Diagnostic Manual for Plant Diseases in Vietnam written by and published by . This book was released on 2008 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Isozymes in Plant Genetics and Breeding written by and published by Elsevier. This book was released on 2012-12-02 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developments in Plant Genetics and Breeding, 1A: Isozymes in Plant Genetics and Breeding, Part A focuses on the advancements in the processes, methodologies, and approaches involved in the study of isozymes, including its role in plant genetics and breeding. The selection first elaborates on the historical perspectives of plant isozymes, plant genetics, and isozyme systems to study gene regulation during development. Discussions focus on the use of isozyme and similar comparisons to study differential gene regulation, gene preservation, dissemination of cultivars, propagation of cultivars and breeding lines, and studies on the effect of viral infection and hormones on isozyme expression. The text then examines allozymes in gene dosage studies, gene mapping, and plastid isozymes. The manuscript takes a look at the genetics of mitochondrial isozymes, evolution of plant isozymes, and detection of somatic variation. Topics include evolution of isozymes in plants, generation of isozymes, glutamate dehydrogenase, glutamate-oxaloacetate transaminase, and malate dehydrogenase. The text also ponders on enzyme activity staining, isozymic variation and plant breeders' rights, genetic purity of commercial seed lots, and use of isozymes in plant disease research. The selection is a valuable reference for researchers interested in the role of isozymes in plant genetics and breeding.
Download or read book Fungal Pathology written by J.W. Kronstad and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together twelve chapters on fungal pathogens with the goal of presenting an overview of the current areas of activity and the common themes that pervade research on these important organisms. The timing of the book is appropriate because we have gained sufficient insight from molecular genetic analyses to begin to make some comparisons between different fungal pathogens and to discuss the key advances that have been made. The chapters provide a broad survey of the important topics in fungal pathogenesis including morphogenesis, virulence, avirulence, and signaling. The reader also will fmd clear discussions of parasitism, mutualism, symbiosis, evolution, phylogeny and ecology for those fungi where these issues are especially important. Finally, many of the chapters in this book illustrate the fact that we are on the verge of a revolution in our understanding of fungal pathogens because of the application of genomics to these organisms and their hosts. The fungi included in this book represent many of the most intensively investigated fungal pathogens of plants; in this regard, a chapter is also included for pathogens in the Phytophthora group, even though these organisms are no longer classified as fungi. It is appropriate to include Phytophthora for historical reasons and, in addition, the insights in terms of pathogenesis and host-specific interactions are important to keep in mind when considering fungal pathogens. Chapters are also included on pathogens of insects and humans, as well as endophytic fungi.
Download or read book Arbuscular Mycorrhizas Physiology and Function written by Hinanit Koltai and published by Springer Science & Business Media. This book was released on 2010-08-25 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the years since the first edition of “Arbuscular Mycorrhizas: Physiology and Function” was published, an exceptional proliferation of interest in mycorrhizal biology has developed. This has been associated with advances in different research disciplines such as genetics, genomics, proteomics, metabolomics and physiology, advances which have generated better insight into topics of mycorrhizal biology, including the mechanisms of host-mycorrhiza interactions pre- and post-penetration, the influence of the symbiosis on the host and its surroundings, and the evolution and diversity of mycorrhization. It therefore became necessary to both update and expand the book's coverage in this, its second edition.
Download or read book Plant Microbe Interface written by Ajit Varma and published by Springer. This book was released on 2019-08-02 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book shares the latest insights into the genetic basis of molecular communication between plants and their microbial consortia. Further, the book highlights the capabilities of the rhizosphere and endosphere, which help manage ecosystem responses to climate change, nutrient cycling and sequestration of carbon; and discusses their application to the development and management of renewable energy sources. In their natural environments, plants are surrounded by a tremendous number of microorganisms. Some microbes directly interact with plants in a mutually beneficial fashion, while others colonize plants solely for their own advantage. In addition, microbes can indirectly affect plants by drastically altering their environments. Understanding the complex nature of the plant-microbe interface (PMI) can pave the way for novel strategies to improve plant productivity in an eco-friendly manner. The PMI approach focuses on understanding the physical, molecular, and chemical interactions between organisms in order to determine their functional roles in biological, physical, chemical and environmental systems. Although several metabolites from plants and microbes have now been fully characterized, their roles in chemical interactions between these associates remain poorly understood, and require further investigation.
Download or read book Bananas and Plantains written by S. Gowen and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a field of mature bananas, plants can be seen at all stages of vegetative growth and fruit maturity, providing a fascination for anyone who has an interest in growing crops. Banana farmers in the tropics can harvest fruit every day of the year. The absence of seasonality in production is an advantage, in that it provides a continuity of carbohydrate to meet dietary needs as well as a regular source of income, a feature that perhaps has been under-estimated by rural planners and agricultural strategists. The burgeoning interest in bananas in the last 20 years results from the belated realization that Musa is an under-exploited genus, notwithstanding the fact that one genetically narrow group, the Cavendish cultivars, supply a major export commodity second only to citrus in terms of the world fruit trade. International research interest in the diversity of fruit types has been slow to develop, presumably because bananas and plantains have hitherto been regarded as a reliable backyard source of dessert fruit or starch supplying the needs of the household, and in this situation relatively untroubled by pests, diseases or agronomic problems.
Download or read book The Genus Fusarium written by C. Booth and published by . This book was released on 1971 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genomics of Plant Associated Fungi and Oomycetes Dicot Pathogens written by Ralph A. Dean and published by Springer. This book was released on 2014-08-22 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes how genomics has revolutionized our understanding of agriculturally important plant-associated fungi and oomycetes. It illustrates some fundamental discoveries about these eukaryotic microbes with regard to the overall structure of their genomes, their lifestyles and the molecular mechanisms that form the basis of their interactions with plants. Genomics has provided new insights into fungal lifestyles and led to practical advances in plant breeding and crop protection, such as predictions about the spread and evolution of new pathogens. This volume focuses on fungi and oomycetes that are typical dicot plant pathogens and includes: Sclerotinia sclerotiorum, Botrytis cinerea, Alternaria sp.,Verticillium alfalfae and Verticillium dahliae, Fusarium oxysporum, Phytophthora capsici, Phytophthora sojae, Phytophthora ramorum, Phytophthora infestans, Hyaloperonospora arabidopsidis.
