P. Narayanasamy – författare

Soilborne microbial plant pathogens including oomycetes, fungi, bacteria and viruses cause several economically important destructive diseases and the symptoms of infection can be recognized only after the pathogen has invaded many tissues primarily vascular tissues of susceptible plants. This condition places formidable challenges in investigating different aspects of host-microbial pathogen interactions.Early detection of infection and precise identification, differentiation, and quantification of the microbial plant pathogens in plants, soil and water sources are essential requirements for development of effective tactics to reduce the incidence and spread of the diseases caused by them. As the microbial plant pathogens differ in their virulence and sensitivity to the environment and chemicals applied, it is imperative to assess the extent of variability in the concerned pathogens. This first volume of a two-volume set introduces disease-causing microorganisms including oomycetes, fungi, bacteria, and viruses found in soils. It focuses on the biology, detection, and identification of soilborne bacterial, fungal, and viral plant pathogens. This volume discusses various techniques based on biological, immunological and genetic properties of the pathogens indicating their advantages and limitations for selecting the appropriate technique to fulfill the requirements. Features:Presents techniques useful for detection, identification, quantification of microbial plant pathogens in plants, soil, and irrigation water from waterbodies.Highlights subversive activities of viruses, resulting in the breakdown of host defense systems. Discusses RNA silencing in infected plants by viruses and posttranscriptional gene silencing (PTGS) functioning as an endogenous mechanism in plants against virus infection. Presents information on methods of assessment of genetic variability and sensitivity of microbial plant pathogens to chemicals and adverse environmental conditions.

Crop disease management strategies revolve around the principles of exclusion, eradication and immunization. Cultural practices are aimed at preventing or reducing the accumulation of pathogen population (inoculum). Development of cultivars with genetic resistance by transgressing resistance gene(s) through traditional breeding procedures or biotechnological techniques is the most effective and acceptable strategy, as it is environment-friendly and does not need any additional cost to the grower. Assessment of different grades of resistance of cultivars or genotypes to soilborne microbial pathogens has been possible by quantifying pathogen populations or their DNA contents in the test plants by applying biological and molecular methods.This second volume of a two-volume set focuses on the soilborne microbial plant pathogens and the diseases caused by them. The book provides information on ecology and epidemiology of soilborne microbial plant pathogens and various strategies applicable for effective management of diseases. Chapters cover exclusion and prevention strategies; improvement of host plant resistance; biological management; application of chemicals; and integration of these disease management strategies. FeaturesDiscusses various aspects of soilborne microbial plant pathogens to develop effective methods of managing diseases. Presents information on epidemiology and ecology of soilborne microbial plant pathogens.Facilitates the application of management strategies alone or in combination with others for effective suppression of disease development. Features information on application of biotic and abiotic biological control agents (BCAs) to suppress pathogen development either by directly acting on the pathogen(s) or indirectly by enhancing host resistance to the pathogens.Employs biotic and abiotic biocontrol agents either to replace or reduce the use of chemicals is an achievable approach for managing the soilborne microbial pathogens.

Soil has a versatile role in supporting the development of a wide range of organisms, including plants and microorganisms. Soilborne pathogens and root diseases are the primary limiting factor in many crops and tend to be very difficult to control. This first volume of a two-volume set introduces disease-causing microorganisms including oomycetes, fungi, bacteria, and viruses found in soils. It focuses on the biology, detection, and identification of soilborne bacterial, fungal, and viral plant pathogens. Volume two provides information on ecology and epidemiology of soilborne microbial plant pathogens and strategies applicable to manage diseases. Chapters cover exclusion and prevention strategies; improvement of host plant resistance; biological management; application of chemicals; and integration of disease management strategies.

This work provides information on the detection, identification, and differentiation of all microbial plant pathogens - presenting modern protocols for rapid diagnosis of diseases based on biological, physical, chemical and molecular properties. It contains methods for the selection of disease-free seeds and vegetatively propagated planting materials and quarantine techniques for screening newly introduced plant materials.

POSTHARVEST PATHOGENS AND DISEASE MANAGEMENT Postharvest diseases caused by microbial pathogens account for millions of dollars in losses of both durable and perishable produce products every year. Moreover, with consumers increasingly demanding minimally processed vegetables and fruits--which can be invaded by human pathogens--there is an imperative need for suitable protective measures to provide pathogen-free commodities that are free from, or contain only acceptable levels of, chemical residues. Providing details of both conventional and modern molecular techniques applicable for the detection, identification, and differentiation of field and storage microbial pathogens, Postharvest Pathogens and Disease Management:* Discusses diseases of both durables and perishables during transit and storage* Provides a basic understanding of the effects of handling and storage practices as well as field conditions and product susceptibility on the development of postharvest diseases* Reveals, as a cautionary note, the potential hazards of mycotoxins with carcinogenic properties that can contaminate fruits and vegetables* Contains detailed information derived from elucidative evidence and disease data in order to explain the infection process and subsequent stages of disease development* Helps readers to avoid conditions that favor disease incidence and spread* Includes real life examples of disease management strategies to help readers develop effective disease management systems suitable for different ecosystems* Emphasizes the importance of integrating several different effective methods in tandem, including the development of cultivars with resistance to postharvest diseases; the selection of suitable analytical methods; and the effective use of biocontrol agents and chemicals* Presents protocols for numerous techniques and basic methods, making the book a distinctive and highly useful teaching and research tool Postharvest Pathogens and Disease Management offers readers insight into the principles and methods of avoiding and managing postharvest diseases of fruit and vegetable products in an efficient, economical, and environmentally feasible manner, allowing producers to sell safer, higher-quality produce to the public and prevent the losses associated with postharvest disease.

This work provides information on the detection, identification, and differentiation of all microbial plant pathogens - presenting modern protocols for rapid diagnosis of diseases based on biological, physical, chemical and molecular properties. It contains methods for the selection of disease-free seeds and vegetatively propagated planting materials and quarantine techniques for screening newly introduced plant materials.

Soil has a versatile role in supporting the development of a wide range of organisms, including plants and microorganisms. Soilborne pathogens and root diseases are the primary limiting factor in many crops and tend to be very difficult to control. This first volume of a two-volume set introduces disease-causing microorganisms including oomycetes, fungi, bacteria, and viruses found in soils. It focuses on the biology, detection, and identification of soilborne bacterial, fungal, and viral plant pathogens. Volume two provides information on ecology and epidemiology of soilborne microbial plant pathogens and strategies applicable to manage diseases. Chapters cover exclusion and prevention strategies; improvement of host plant resistance; biological management; application of chemicals; and integration of disease management strategies.

Soilborne microbial plant pathogens including oomycetes, fungi, bacteria and viruses cause several economically important destructive diseases and the symptoms of infection can be recognized only after the pathogen has invaded many tissues primarily vascular tissues of susceptible plants. This condition places formidable challenges in investigating different aspects of host-microbial pathogen interactions.Early detection of infection and precise identification, differentiation, and quantification of the microbial plant pathogens in plants, soil and water sources are essential requirements for development of effective tactics to reduce the incidence and spread of the diseases caused by them. As the microbial plant pathogens differ in their virulence and sensitivity to the environment and chemicals applied, it is imperative to assess the extent of variability in the concerned pathogens. This first volume of a two-volume set introduces disease-causing microorganisms including oomycetes, fungi, bacteria, and viruses found in soils. It focuses on the biology, detection, and identification of soilborne bacterial, fungal, and viral plant pathogens. This volume discusses various techniques based on biological, immunological and genetic properties of the pathogens indicating their advantages and limitations for selecting the appropriate technique to fulfill the requirements. Features:Presents techniques useful for detection, identification, quantification of microbial plant pathogens in plants, soil, and irrigation water from waterbodies.Highlights subversive activities of viruses, resulting in the breakdown of host defense systems. Discusses RNA silencing in infected plants by viruses and posttranscriptional gene silencing (PTGS) functioning as an endogenous mechanism in plants against virus infection. Presents information on methods of assessment of genetic variability and sensitivity of microbial plant pathogens to chemicals and adverse environmental conditions.

Crop disease management strategies revolve around the principles of exclusion, eradication and immunization. Cultural practices are aimed at preventing or reducing the accumulation of pathogen population (inoculum). Development of cultivars with genetic resistance by transgressing resistance gene(s) through traditional breeding procedures or biotechnological techniques is the most effective and acceptable strategy, as it is environment-friendly and does not need any additional cost to the grower. Assessment of different grades of resistance of cultivars or genotypes to soilborne microbial pathogens has been possible by quantifying pathogen populations or their DNA contents in the test plants by applying biological and molecular methods.This second volume of a two-volume set focuses on the soilborne microbial plant pathogens and the diseases caused by them. The book provides information on ecology and epidemiology of soilborne microbial plant pathogens and various strategies applicable for effective management of diseases. Chapters cover exclusion and prevention strategies; improvement of host plant resistance; biological management; application of chemicals; and integration of these disease management strategies. FeaturesDiscusses various aspects of soilborne microbial plant pathogens to develop effective methods of managing diseases. Presents information on epidemiology and ecology of soilborne microbial plant pathogens.Facilitates the application of management strategies alone or in combination with others for effective suppression of disease development. Features information on application of biotic and abiotic biological control agents (BCAs) to suppress pathogen development either by directly acting on the pathogen(s) or indirectly by enhancing host resistance to the pathogens.Employs biotic and abiotic biocontrol agents either to replace or reduce the use of chemicals is an achievable approach for managing the soilborne microbial pathogens.

This book provides comprehensive knowledge of the methods of detection and identification of phyllosphere microbial pathogens and the management of different kinds of diseases caused by them in various crops. Interactions between pathogens and host plants result in the induction of defense responses expressed via molecular signals, from initiation of infection to systemic progression of pathogen invasion in susceptible plants and contrasting signals in resistant plants, leading to inhibition of pathogen development through activation of preinfectional and postinfectional defense responses. These are critically discussed.The author describes the intricate and complex competitive activities of the pathogens and host plants in a molecular warfare that the host plant must win to break the link in the pathogens' life cycle, allowing the development of disease management strategies based on the principles of exclusion, eradication, and immunization. Integration of strategies concerning the development of cultivars resistant to pathogens through breeding and biotechnological techniques, application of biotic and abiotic inducers of resistance to pathogens, and use of disease-free seeds and propagules that are complementary to each other along with effective cultural practices are emphasized.This book presents information gathered through an extensive literature search to help researchers and graduate students in agricultural sciences identify research gaps and successfully complete their research projects.

This book provides comprehensive knowledge of the methods of detection and identification of phyllosphere microbial pathogens and the management of different kinds of diseases caused by them in various crops. Interactions between pathogens and host plants result in the induction of defense responses expressed via molecular signals, from initiation of infection to systemic progression of pathogen invasion in susceptible plants and contrasting signals in resistant plants, leading to inhibition of pathogen development through activation of preinfectional and postinfectional defense responses. These are critically discussed.The author describes the intricate and complex competitive activities of the pathogens and host plants in a molecular warfare that the host plant must win to break the link in the pathogens' life cycle, allowing the development of disease management strategies based on the principles of exclusion, eradication, and immunization. Integration of strategies concerning the development of cultivars resistant to pathogens through breeding and biotechnological techniques, application of biotic and abiotic inducers of resistance to pathogens, and use of disease-free seeds and propagules that are complementary to each other along with effective cultural practices are emphasized.This book presents information gathered through an extensive literature search to help researchers and graduate students in agricultural sciences identify research gaps and successfully complete their research projects.

This volume reviews research on molecular biology of pathogens, infection process and disease resistance. Also included are strategies to incorporate disease resistance genes from diverse sources, and experimental protocols useful to students and researchers.

Studies on the phenomenon of plant pathogenesis (disease development) have been useful to have a deep insight into the interactions between host plant and the pathogen.

Identification of sources of resistance genes, cloning and characterization of desired resistance genes and incorporation of resistance gene(s) into cultivars and transformation of plants with selected gene(s) have been successfully performed by applying appropriate molecular techniques.

Find out more about convenient immunoassays you can implement in your own research! From the Foreword, by M. S. Swaminathan, Chairman of the M. S. Swaminathan Research Foundation: The book provides remedies to the common maladies relating to quality and safety of dietary material. Professor Narayanasamy has compiled and presented with great clarity the latest information on all aspects relating to immunology in plant health and food safety. We owe Professor Narayanasamy a deep debt of gratitude for this labor of love in the cause of improving food and feed quality and safety.Immunology in Plant Health and Its Impact on Food Safety suggests cost-effective, simple, and sensitive immunological techniques to assess plant health and food safety for the production of desirable foods, feeds, and timbers. This book explores the structure and biochemical constituents of healthy plants and the abiotic and biotic stresses that can cause a marked reduction in quantity and quality of agricultural produce. Researchers, faculty members, and graduate scholars in plant pathology, microbiology, biochemistry, environmental sciences, and food technology will find this text useful for producing healthy plants while maintaining a pollution-free environment. In Immunology in Plant Health and Its Impact on Food Safety, methods to develop stress-resistant cultivars are discussed to enable you to select the most suitable strategies for maintaining production and quality without the use of chemicals. This valuable resource provides detailed instructions for employing immunoassays that are rapid, reproducible, and amenable for large-scale application in place of cumbersome and expensive methods currently in use. With this important tool, you will be able to plan and develop programs to obtain agricultural produce of high quality acceptable for human and animal consumption. With Immunology in Plant Health and Its Impact on Food Safety, you’ll learn more about:agrosystems immunological reactions preparations of antisera immunodetection techniques plant-stress interactions genetic manipulations disease resistance and the production of disease-free plants mycotoxins chemical residues This essential guide provides you with access to a wide spectrum of information never before encompassed in a single book, saving you time and energy. Figures, photographs, and tables with appropriate data supply visual and factual support for the points discussed in the text. Immunology in Plant Health and Its Impact on Food Safety includes a large number of citations (over 1000) for further research and development in your chosen field of study.

Find out more about convenient immunoassays you can implement in your own research! From the Foreword, by M. S. Swaminathan, Chairman of the M. S. Swaminathan Research Foundation: The book provides remedies to the common maladies relating to quality and safety of dietary material. Professor Narayanasamy has compiled and presented with great clarity the latest information on all aspects relating to immunology in plant health and food safety. We owe Professor Narayanasamy a deep debt of gratitude for this labor of love in the cause of improving food and feed quality and safety.Immunology in Plant Health and Its Impact on Food Safety suggests cost-effective, simple, and sensitive immunological techniques to assess plant health and food safety for the production of desirable foods, feeds, and timbers. This book explores the structure and biochemical constituents of healthy plants and the abiotic and biotic stresses that can cause a marked reduction in quantity and quality of agricultural produce. Researchers, faculty members, and graduate scholars in plant pathology, microbiology, biochemistry, environmental sciences, and food technology will find this text useful for producing healthy plants while maintaining a pollution-free environment. In Immunology in Plant Health and Its Impact on Food Safety, methods to develop stress-resistant cultivars are discussed to enable you to select the most suitable strategies for maintaining production and quality without the use of chemicals. This valuable resource provides detailed instructions for employing immunoassays that are rapid, reproducible, and amenable for large-scale application in place of cumbersome and expensive methods currently in use. With this important tool, you will be able to plan and develop programs to obtain agricultural produce of high quality acceptable for human and animal consumption. With Immunology in Plant Health and Its Impact on Food Safety, you’ll learn more about:agrosystems immunological reactions preparations of antisera immunodetection techniques plant-stress interactions genetic manipulations disease resistance and the production of disease-free plants mycotoxins chemical residues This essential guide provides you with access to a wide spectrum of information never before encompassed in a single book, saving you time and energy. Figures, photographs, and tables with appropriate data supply visual and factual support for the points discussed in the text. Immunology in Plant Health and Its Impact on Food Safety includes a large number of citations (over 1000) for further research and development in your chosen field of study.

The book presents strategies for the management of crop diseases, and explores means of integrating various strategies to achieve desired levels of suppression. It describes methods of preventing introduction of microbial pathogens, cultural practices that suppress pathogen populations, alternative soil treatments, resistant cultivars, biocontrol agents, biotechnology for improvement of disease resistance, and crop disease management using chemicals. The introductory chapters review the characteristics of microbial pathogens and the diagnosis of crop diseases caused by them.

Crop diseases are typically caused by a variety of abiotic and biotic factors. Among these biotic factors, microbial plant pathogens such as fungi, bacteria, phytoplasmas, viruses, and viroids are responsible for significant quantitative and qualitative losses in agricultural and horticultural crops. To effectively manage crop diseases, it is crucial to have a thorough understanding of the various aspects of these plant pathogens. This includes information on the precise identification of microbial plant pathogens, the process of disease development, epidemiology, assessment of losses due to diseases, principles of disease management, and their applications for containing the diseases. Additionally, information on possible ways of integrating these practices is necessary to develop and enhance the effectiveness of disease management systems suitable for different ecosystems. The basic plant pathological methods provided in the appendix and the glossary of plant pathological terms presented in this book will help students gain a clear understanding of the subject. This book will be useful for graduating students, researchers, and teachers who wish to update their knowledge on various aspects of microbial plant pathogens and the diseases they cause.

This volume reviews research on molecular biology of pathogens, infection process and disease resistance. Also included are strategies to incorporate disease resistance genes from diverse sources, and experimental protocols useful to students and researchers.

Studies on the phenomenon of plant pathogenesis (disease development) have been useful to have a deep insight into the interactions between host plant and the pathogen. Depending on the levels of susceptibility (compatibility) or resistance (incompatibility) of the host plant and virulence of the pathogen, disease development may progress, either leading to symptom expression or result in the suppression of pathogen proliferation. Molecular techniques have been applied to elucidate the nature of interactions between the gene products of the plant and pathogen at cellular and molecular levels. Successful evasion of host’s surveillance system and subsequent activities of metabolites of the pathogen (enzymes and toxins) encoded by pathogen genes counteracting the effects of various defense-related antimicrobial compounds present already or produced by the host plants, after initiation of infection have been critically studied by applying various molecular techniques. In addition to studying various phases of disease development in individual plants, molecular methods have been demonstrated to be effective, in gathering data on various aspects of epidemiology under natural conditions where the interaction of pathogen with populations of plants is influenced significantly by the environmental conditions existing in different ecosystems. This volume focuses on the possibility of applying the knowledge on pathogenesis and molecular epidemiology to determine the vulnerable stages in the life cycles of the pathogens that can be disrupted to achieve more effective disease control.

Identification of sources of resistance genes, cloning and characterization of desired resistance genes and incorporation of resistance gene(s) into cultivars and transformation of plants with selected gene(s) have been successfully performed by applying appropriate molecular techniques.

Morphological, biological, biochemical and physiological characteristics have been used for the detection, identification and differentiation of fungal pathogens up to species level.

The need for the development of techniques based on the characteristics of the viral proteins and genomic nucleic acids was realized in order to detect, identify, differentiate and quantify viruses in the infected plants/planting materials with or without symptoms of infection.

Microbial plant pathogens causing qualitative and quantitative losses in all corps are present not only in the infected plants, but also in the environmental comprising of soil, water and air.

Crop diseases are typically caused by a combination of abiotic and biotic factors. Among these biotic factors, microbial plant pathogens such as fungi, bacteria, phytoplasmas, viruses, and viroids can result in significant qualitative and quantitative losses for agricultural and horticultural crops. It is crucial to possess comprehensive knowledge about these plant pathogens and their various aspects. This includes information on the precise identification of microbial plant pathogens, the process of disease development, epidemiology, the assessment of losses due to diseases, disease management principles, and their applications for mitigating the spread of diseases. Developing and enhancing the effectiveness of disease management systems requires knowledge suitable for different ecosystems. The basic plant pathological methods provided in the appendix and the glossary of plant pathological terms presented in this book will help students gain a clear understanding of the subject. This book will be useful for graduating students, researchers, and teachers who wish to update their knowledge on the various aspects of microbial plant pathogens and the diseases they cause.

Biological management of diseases of crops is influenced by the nature of interactions between the pathogens and other organisms and the plants. Due to development of resistance in pathogens to fungicides and bactericides, determination of compatibility of biotic biocontrol agents with chemicals is essential for selecting strains of biocontrol agents (BCAs) showing resistance to chemicals to effectively restrict use of the chemicals. Microbial plant pathogens and the antagonists present in the soil and on the plant surfaces are influenced by various cultural practices. It is possible to reduce disease incidence and intensity by crop sanitation and using  appropriate rotational crops. Application of physical techniques involving the use of heat, solarization and irradiation has potential to reduce the pathogen population or weaken the potential of pathogens present in the seed, planting materials and soil.

Biological disease management tactics have emerged as potential alternative to chemical application for containing crop diseases. Biotic and abiotic biological control agents (BCAs) have been demonstrated to be effective against diseases caused by microbial plant pathogens. Combination of biotic and abiotic agents leads to synergism and consequent improvement in the effectiveness of disease control. It is essential to assay the biocontrol potential of all isolates/species of fungal, bacterial and viral biocontrol agents by different techniques in vitro and under greenhouse and field conditions and to precisely identify and differentiate the most effective isolates from less effective ones by employing biological, immunological and nucleic acid-based assays.

Morphological, biological, biochemical and physiological characteristics have been used for the detection, identification and differentiation of fungal pathogens up to species level.