Brassinosteroids

Plants possess the ability to biosynthesize a large variety of steroids, but it was not until 1979 that a hormonal function was demonstrated in plants. Today, about 40 structurally and functionally related steroids, known as brassinosteroids, have been isolated from natural sources. Brassinosteroids demonstrate various kinds of regulatory activities in the growth and development of plants. This book is based on a 1990 Russian monograph, but includes all important subsequent literature and developments, including unpublished data from the authors' laboratories. BRASSINOSTEROIDS: A New Class of Plant Hormones covers: Structures and classification Isolation and spectroscopic determination Biosynthesis and metabolism Natural product synthesis Physiological mode of action Structure-activity relationships Practical applications in agriculture

Brassinosteroids in Plant Developmental Biology and Stress Tolerance presents the mechanisms of brassinosteroid-regulated plant developmental biology and stress tolerance that cover various biochemical, physiological, genetic and molecular studies. As unprecedented climate change threatens global food security, studies reveal that BRs could not only protect plants from stresses to ensure food security, but also reduce toxic compounds in edible plant parts. As the utilization of BRs in modern agriculture is of great significance in the context of global climate change, this book presents key information on how to develop eco-friendly growth regulators and understand the importance of brassinosteroids in safe food production. Presents the multifaceted roles of brassinosteroids as phytohormones in plant growth, development and response to biotic and/or abiotic stresses Unveils the physiological and molecular mechanisms controlling plant stress response to biotic and abiotic stress Discusses developmental processes relating to environmental adaptations that are mediated by brassinosteroids Brings together recent works of experts studying brassinosteroid crosstalk with other signals, including hormones, sugars, redox and light signals

The entire range of the developmental processes in plants is regulated by a shift in the hormonal concentration, tissue sensitivity and their interaction with the factors operating around them. Out of the recognized hormones, attention has largely been focused on five - Auxins, Gibberellins, Cytokinin, Abscisic acid and Ethylene. However, the information about the most recent group of phytohormone (Brassinosteroids) has been incorporated in this book. This volume includes a selection of newly written, integrated, illustrated reviews describing our knowledge of Brassinosteroids and aims to describe them at the present time. Various chapters incorporate both theoretical and practical aspects and may serve as baseline information for future researches through which significant developments are possible. This book will be useful to the students, teachers and researchers, both in universities and research institutes, especially in relation to biological and agricultural sciences.

J.W. Mitchell, N.B. Mandava and others' 1970 publication in Nature, "Brassins-A New Family of Plant Hormones from Rape Pollen" announced the discovery of a new plant hormone, brassinolide, which would also mark the sixth and newest group of plant hormones, brassinosteroids. This monograph details the early research leading to the isolation and synthesis of the first brassinosteroid to current research in the field. The 50 years of brassinosteroid research can be separated in two parts; The first 25 years saw the innovation of different bioassays and isolation techniques while the last 25 years saw the investigation into brassinosteroids signaling, cross talk, stress response, and agricultural application. Since the discovery of brassinolide, there have now been 62 brassinosteroids identified through international research efforts. Several of these have been targeted for agricultural use with patents in many countries. Homobrassinolide is one such brassinosteroid that helps improve crop yield and fruit sweetness while conferring stress resistance. This monograph is the first to fully encompass the story of brassinosteroids. Progress in the First 25 Years Discovery of Brassins 1970 - Mitchell, Mandava, and others (Nature article) Screening of Various Kinds of Pollen Brassins - Field trials in Brazil and the USA Discovery of Brassinolide Detection of active ingredient by Bean Second-Internode Bioassay Isolation from Rapeseed (Brassica napus L.) Pollen Development of Laboratory Scale Purification Method Pilot-Plant Extraction of Pollen Identification of Brassinolide Synthesis of Brassinolide Structure-Activity of Brassinolide Analogs Synthesis of Brassinolide from sterol isolated from oysters Other Synthetic Methods for Brassinolide Development of Other Bioassays - Screening of Brassinosteroids using Various Bioassays Development of Sensitive Analytical Methods for Detection of Brassinosteroids Isolation of Other Brassinosteroids from Various Plant Sources Synthesis of Other Brassinosteroids Selection of three Brassinosteroids based on Bioassays Metabolism of Brassinosteroids Biosynthesis of Brassinosteroids Progress in the Second 25 Years Brassinosteroid Signaling Brassinosteroid Crosstalk Physiological Responses Senescence Stress Responses Pathogen Attack Gene Regulation Signal Transduction Metabolism of Brassinosteroids (cont.) Brassinosteroid Bio efficacy Agricultural Uses Mode of Action and Economic Benefits Field Trials

The entire range of the developmental processes in plants is regulated by the shift in the hormonal concentration, tissue sensitivity and their interaction with the factors operating around the plants. Out of the recognized hormones, attention has largely been focused on five (Auxins, Gibberellins, Cytokinin, Abscisic acid and Ethylene). However, in this book, the information about the most recent group of phytohormones (Brassinosteroids) has been compiled by us. It is a class of over 40 polyhydroxylated sterol derivatives, ubiquitously distributed throughout the plant kingdom. A large portion of these steroids is restricted to the reproductive organs (pollens and immature seeds). Moreover, their strong growth-inducing capacity, recognized as early as prior to their identification in 1979, tempted the scientists to visualize the practical importance of this group of phytohormones. The brassin solution, from rape pollen, was used in a collaborative project by the scientists of Brazil and U. S. A. in a p- sowing seed treatment to augment the yield. This was followed by large-scale scientific programmes in U. S. , Japan, China, Germany and erstwhile U. S. S. R. , after the isolation of the brassinosteroids. This approach suits best in today’s context where plants are targeted only as producers and hormones are employed to get desired results. Chapter 1 of this book (which embodies a total of 10 chapters), gives a comprehensive survey of the hitherto known brassinosteroids, isolated from lower and higher plants.

Brassinosteroids are plant-growth-promoting natural products similar in structure to animal and insect steroid hormones. Considered a new class of plant hormone, along with auxins, gibberellins, cytokinins, abscisic acid, and ethylene, brassinosteroids are present throughout the plant kingdom. They show distinct physiological effects on plant growth including improvement of stress tolerance in crop production. These discoveries, together with advances in molecular and biosynthetic studies of brassinosteroids, open new aspects of research in understanding the growth and development of plants. This book presents a comprehensive view of the related chemistry, biochemistry, physiology, agricultural applications, and most recent research in molecular biology. Written by scientists who are active in these fields, Brassinosteroids is a vital source of information for plant and agricultural science researchers with an interest in plant hormones.

This book provides a comprehensive update on recent developments of Jasmonates (JAs) and Brassinosteroids (BRs) in plant signalling and biotechnological applications. Over the last few decades, an enormous amount of research data has been generated on these two signalling molecules. This valuable compilation will enhance the basic understanding of JAs and BRs mechanism of actions ensuing tolerance mechanism of crops under climate changes for sustainable agriculture and human welfare. This book covers topics regarding the occurrence of JAs and BRs in plants, biosynthesis, role in plant growth and development, role of these PGRs during various abiotic stress tolerance in plants, crosstalk of Reactive Oxygen Species (ROS) and plant stress mitigation, regulation of JAs and BRs signaling pathways by microRNA, along with physiological and anatomical roles of JAs and BRs as wound healing, regeneration and cell fate decisions. The cross talk of JAs and BRs with neurotransmitters in plant growth and development. Bio-fortification of crop plants with BRs in managing in human health issues chapter enlightened new role of BRs in human wellbeing. This book will be beneficial to scientists, researchers, agriculturists, horticulturists, industries related to the crop and food production KEY FEATURES Reviews the global scientific literature and experimental data of the authors on the occurrence of JAs and BRs in various plants Update information on recent developments of JAs and BRs signalling and biotechnological applications in plants Highlights the physiological, metabolic and molecular mechanism of JAs and BRs under variable climates Addresses the abiotic and biotic tolerance management by JAs and BRs Describes the role of JAs and BRs in sustainable agriculture and human welfare in eco-friendly manner

The entire range of the developmental process in plants is regulated by a shift in the hormonal concentration, tissue sensitivity and their interaction with the factors operating around the plants. Phytohormones play a crucial role in regulating the direction of plant in a coordinated fashion in association with metabolism that provides energy and the building blocks to generate the form that we recognize as a plant. Out of the recognized hormones, attention has largely been focused on Auxins, Gibberellins, Cytokinins, Abscisic acid, Ethylene and more recently on Brassinosteroids. In this book we are providing the information about a brassinosteroids that again confirm its status as phytohormones because it has significant impact on various aspects of the plant life and its ubiquitous distribution throughout the plant kingdom. Brassinosteroids are generating a significant impact on plant growth and development, photosynthesis, transpiration, ion uptake and transport, induces specific changes in leaf anatomy and chloroplast structure. This book is not an encyclopedia of reviews but includes a selected collection of newly written, integrated, illustrated reviews describing our knowledge of brassinosteroids. The aim of this book is to tell all about brassinosteroids, by the present time. The various chapters incorporate both theoretical and practical aspects and may serve as baseline information for future researches through which significant development is possible. It is intended that this book will be useful to the students, teachers and researchers, both in universities and research institutes, especially in relation to biological and agricultural sciences.