E-Resources
Herbivores: their Interactions with Secondary Plant Metabolites: Volume I
It has been more than ten years since the first edition of this book was published. During this time, our understanding of the interactions between plants and the animals that consume them, as mediated by secondary compounds (allelochemicals) of plants, has grown dramatically.In theHerbivores: Their Interactions with Secondary Plant Metabolites, Second Edition, only those areas of research where significant progress has been made since 1979 are included, and most of the contributing authors are new. This edition has been split into two volumes due to the vast amount of new material that has been generated on this subject.Both volumes will be of interest to evolutionary biologists, agriculturists, chemists, biochemists, physiologists, and ecologists.Volume 1, provides an exhaustive update and review of the chemical and biochemical bases for the role and function of allelochemicals in their defense against herbivores.Volume 2, scheduled for publication in April 1992, provides a current update of the research on the ecological roles and evolutionary nature of secondary plant metabolites in their interactions among plants and as protective agents against environmental stresses such as consumption by herbivores.
Herbivores: their Interactions with Secondary Plant Metabolites: Volume II
"This volume presents the latest research on herbivores, aquatic and terrestrial mammals and insects. The Second Edition, written almost entirely by new authors, effectively complements the initial work. It includes advances in molecular biology and microbiology, ecology, and evolutionary theory that have been achieved since the first edition was published in 1979. The book also incorporates relatively new methodologies in the area of molecular biology, like protein purification and gene cloning. Volume II, Ecological and Evolutionary Processes, also opens up entirely new subjects: The discussions of interactions have expanded to include phenomena at higher trophic levels, such as predation and microbial processing and other environmental influences. Both this and Volume I, The Chemical Participants, will be of interest to chemists, biochemists, plant and insect ecologists, evolutionary biologists, physiologists, entomologists, and agroecologists interested in both crop and animal science. Key Features. Presents coevolution of herbivores and host plants. Examines resource availability and its effects on secondary metabolism and herbivores. Studies physiology and biochemistry of adaptation to hosts. Includes tri-trophic interactions involving predators and microbes"
Hormone Action in Plant Development A Critical Appraisal
Hormone Action in Plant Development - A Critical Appraisal documents the proceedings of the Tenth Long Ashton Symposium, September 1986. The symposium was convened to assess the evidence for and against the view that plant hormones are endogenous regulators of plant development. The meeting also aimed to focus on and assess promising strategies for future research. The symposium opened with the Douglas Wills Lecture, given by Professor Carl Leopold. In many respects, progress in research on animal hormones seems greater than in the plant sciences and there may well be merit in following progress in animal hormone research as suggested by Professor Leopold. The symposium was comprised of four sessions. The introductory session considered the coordinating role of hormones in plant growth and development, and focused on hormone action at the molecular level, including their binding to receptors and their control of gene expression. The next two sessions embraced contributions on the experimental manipulation of development by genetic (notably by biochemical mutants), chemical (for example, with gibberellin/biosynthesis inhibitors), and environmental (including drought stress) means. All these approaches consolidated the central importance of hormones in plant growth. In the final session, three speakers suggested some promising avenues for future research into the physiology, biochemistry, and molecular biology of plant hormones.
Host-pathogen Interactions in Plant Disease
This book describes the genetics, biochemistry, and epidemiology of host-pathogen interactions in plant disease, especially as they concern the breeding of crops for disease resistance. It analyzes a wealth of information that has not previously been recorded in other books or reviews. Some of it stems from basic surveys of disease in the field. The analysis of these surveys not only explains a great deal about host-pathogen interactions that was heretofore obscure, but also indicates directions for future research. Other data, from original papers, have now been coordinated for the first time and organized in a way that suggests new areas of research. The book contains more than fifty new tables that integrate data and relate them to general principles of host-pathogen interactions. For plant pathologists and plant breeders concerned with the control of plant disease, the book shows how to manipulate the host and, indirectly, the pathogen in order to control disease. It analyzes records of resistance against disease that time has shown to be stable in an effort to determine what has kept this resistance stable. It also analyzes the structure of virulence in populations of a pathogen, and demonstrates how virulence can be deliberately restricted. The author updates information on the gene-for-gene hypothesis and discusses the numerical and biological implications of the hypothesis. He analyzes the structure of epidemics based on three fundamental variables: the initial inoculum, the progeny/parent ratio of the pathogen, and the latent period. The author concentrates on the progeny/parent ratio - a subject not hitherto probed in detail in the literature - and shows how to determine the type of epidemic that can occur.
How Plants Defend Themselves
Plant Disease An Advanced Treatise, Volume V: How Plants Defend Themselves describes the active, passive, physical, chemical, mechanical, and physiological defense systems of plants against the pathogens. Divided into 23 chapters, this volume discusses theories, experimental approaches, and ways to help plant defend themselves. The opening chapters of this volume deal with certain general aspects of plant defense, such as the theories of tolerance to disease and the time sequence of defense, including a dynamic model of defense. A chapter discusses how plant populations defend themselves in natural ecosystem and the implications of disease management on agroecosystems. Considerable chapters examine the defense by the host by analogy with defense of a medieval castle, such as perimeter, internal, and chemical defenses. Discussions on the defenses triggered by the invading pathogen; recognition and compatibility phenomena; the concept of hypersensitivity; the role of phytoalexins in defense; and the metabolic detoxification done by plants to suffer less damage from toxins are provided. This volume also discusses the theory and mechanisms of hypovirulence and hyperparasitism. The concluding chapters summarize the effects of numerous nutrients on disease and the mechanisms involved. This volume is an invaluable source for plant pathologists, mycologists, advanced researches, and graduate students.
How Plants Suffer from Disease
Plant Diseases An Advanced Treatise, Volume III: How Plants Suffer from Disease deals with the mechanism on how individual plants suffer from disease. Organized into 19 chapters, this volume discusses plant growth, the conceptual theory of disease development in plants, and the occurrence of different kinds of impairment in diseased plant system. The opening chapters outline the array of physiological functions that are essential in the growth and development of healthy plants. This text also describes the effect of disease on the capture, transfer, and utilization of energy by plants. The subsequent chapters discuss specific types of dysfunction in plant system, including food flow, water system, mineral nutrition, and growth alteration. Other chapters deal with other plant diseases, such as crown gall, teratoma, dysfunction and shortfalls of symbiont responses, disrupted reproduction, and tissue disintegration. This volume also examines various physical factors of the environment that impose mechanical or other physical stresses on plants. It also discusses the engineering mechanics of growing plants and the effect of various pathogens and microorganisms on plant strength and plant organ structural integrity. Other chapters deal with the effect of disease on cell membrane and permeability and on intermediary plant metabolism. The concluding chapters cover the genetic aspects of diseased plants and the diseases that induce senescence and diseases that senescence induced. This volume is an invaluable source for plant pathologists and researchers, mycologists, virologists, and graduate students.
Immune Biology of Allogeneic Hematopoietic Stem Cell Transplantation
"Immune Biology of Allogeneic Hematopoietic Stem Cell Transplantation provides clinical and scientific researchers with a deep understanding of the current research in this field and the implications for translational practice. By providing an overview of the immune biology of HSCT, an explanation of immune rejection, and detail on antigens and their role in HSCT success, this book embraces biologists and clinicians who need a broad view of the deeply complex processes involved. It then moves on to discuss the immunobiology mechanisms that influence graft-versus-host disease (GVHD), graft-versus-leukemia (GVL) effect, and transplantation success. Using illustrative figures, highlighting key issues, describing recent successes and discussing unanswered questions, this book sums up the current state of HSCT to enhance the prospects for the future. Allogeneic HSCT is a medical procedure in which a patient receives blood-forming stem cells from a genetically similar but not identical donor. This procedure is commonly performed for people with diseases of the blood, bone marrow, or certain cancers, but it remains risky with many possible complications. As such, experimental practice is reserved for preclinical animal models including the mouse and dog. These animal models have been essential in developing transplant protocols, including preclinical testing of conditioning regimens, treatment of GVHD, and understanding the pathology of GVHD as well as the immunological mechanisms of GVHD and GVL effect. However, recent research has revealed significant species differences between humans and animal models that must be considered when relating animal model studies to clinical allogeneic HSCT scenarios. Key Features. Brings together perspectives leading laboratories and clinical research groups to highlight advances from bench to the bedside. Guides readers through the caveats that must be considered when drawing conclusions from studies with animal models before correlating to clinical allogeneic HSCT scenarios. Categorizes the published advances in various aspects of immune biology of allegeneic HSCT to illustrate opportunities for clinical applications"
Inorganic Nutrition of Plants
Plant Physiology, Volume III: Inorganic Nutrition of Plants deals with the inorganic nutrition and metabolism of plants. The book explores the role of elements, other than carbon, hydrogen, and oxygen, which are essential to, or used by, plants in their vital processes. It summarizes the knowledge about mineral nutrition of plants and presents a philosophy of plant nutrition in general. This volume is organized into six chapters and begins with a brief history of mineral nutrition of plants, as well as the media from which plants draw their nutrients, such as the soil and artificial culture medium. The book then discusses the requirements for specific elements, the symptoms incurred by their deficient supply, and the evidence that a given element can be considered essential. The next chapters focus on the inorganic nutrition of microorganisms, general functions of the essential nutrient elements, and the biological situations in which elementary nitrogen is converted to the organic form. The book concludes by analyzing the soil as a complex biological system and its implication for the interpretation of the nutrition of higher plants. This book is a valuable resource for those interested in plant nutrition and plant physiology.
Integrative Plant Anatomy
"From this modern and profusely illustrated book, the reader will learn not just the basics, which are amply reviewed, but also how plant anatomy is integrated with a wide variety of other disciplines, such as plant breeding, forensic analysis, medicine, food science, wood and fiber products, and the arts. The author presents the basic concepts and terminology of plant anatomy with a special emphasis on its significance and applications to other disciplines, and addresses the central role of anatomy by consolidating previously scattered information into a single volume. Integrative Plant Anatomy highlights the important contribution made by studying anatomy to the solutions of a number of present and future problems. It succeeds in integrating diverse areas of botany, as well as the non-biological sciences, the arts, and numerous other fields of human endeavor. Key Features. Presents both the classical and modern approaches to the subject. Teaches the importance of the subject to other disciplines such as the nonbiological sciences, the arts, and other fields of human endeavor. Written and organized to be useful to students and instructors, but also to be accessible and appealing to a general audience. Bridges the gap between conventional textbooks and comprehensive reference works. Includes key terms and extensive additional readings. Richly illustrated with line drawings and photographs"
Ion Transport in Plants
Ion Transport in Plants covers knowledge about ion transport in plants. The book discusses ultrastructural localization; formalism and membrane models; and membrane resistance and H+ fluxes. The text also describes + fluxes in cells and organelles; Na+-+ transport and ionic relations of the halophytes; and Cl- transport in vesicles. The ion transport in roots and the symplasm is also considered. Botanists, biochemists and biologists will find the book invaluable.
Kingsmill Plantations 1619 1800
Kingsmill Plantations, 1619-1800: Archaeology of Country Life in Colonial Virginia covers the historical and archaeological aspects, along with reconstruction attempt of a typical setting of seven plantation sites at Kingmill, near Williambsburg, Virginia. This book contains five chapters that focus on the settlement and development of Kingsmills homesteads and estates. Other chapters provide the names and personalities for the plantation sites at Kingmill. Considerable archaeological findings concerning the sites manor, tenements, mansions, houses, quarters, and outbuildings are discussed. The remaining chapters deal with the evaluation of the sites gardens, wells, waste, pots, bones, and status. This book is intended primarily for architectural historians, archaeologists, and anthropologists.
Landscape Design with Plants
Landscape Design with Plants, Second Edition focuses on landscape architecture. The book first discusses trees in the countryside. Adaptation to locality, self-town vegetation, designs for both short-term and long-term effect, ecological planting, and plant associations are described. The text looks at planting for forestry. The need for afforestation; forest habitat; scale of the forest mosaic; and woodlands as visual elements in the landscape are considered. The book puts emphasis on trees in urban areas, shrubs and groundcover, and herbaceous plants and bulbs. The text also focuses on water plants. The use of water plants in garden design, aquatic communities, and historical background are discussed. The book underscores the use and management of plant species native to Britain in landscaping; urban landscape and roof gardens; and how to transplant semi-mature trees. The text also describes reclamation and planting of industrial and urban wastelands; landscaping of reservoir margins; and the relationship of plants and air pollution. The book also puts emphasis on the use of vegetation in slope stabilization; planting in tropical lowland areas; planting in hot, arid climates; and the functional use of Australian plants. The selection is a must for readers interested in landscaping.
Leafhopper Vectors and Plant Disease Agents
Leafhopper Vectors and Plant Disease Agents is the second in a multivolume series on vectors, vector-borne disease agents, and plant disease spread. This text aims to collect findings in leafhopper vector research, to suggest promising frontiers for further research, and to call attention to possible practical applications of understanding of leafhopper-pathogen-plant interactions. This book is organized into five parts. Opening chapters on the taxonomy, bionomics, and worldwide importance of leafhopper and planthopper vectors are appropriately relegated to Parts I and II. Part III focuses on vector-virus interactions of leafhopper-, planthopper-, and aphid-borne viruses and virus-induced, cytopathological changes in vectors. This part also explains the interactions of mycoplasmalike organisms (MLOs) and viruses in dually infected leafhoppers, planthoppers, and plants, as well as the transitory vector-virus interactions. The artificial and aseptic rearing of vectors, microinjection technique, vector tissue culture, and spiroplasmas and its vectors are all covered in Part IV. Part V contains chapters on specific leafhopper-borne viruses and MLOs, leafhopper and planthopper vector control, leafhopper-borne pathogens of corn-stunting diseases, Western X disease, and leafhopper-borne xylem-restricted pathogens. This text will be valuable for students, teachers, and researchers of vector-pathogen-plant relationships. Its in-depth coverage of leafhoppers and planthoppers as vectors makes this book ideally suited as a supplemental text in graduate entomology and plant pathology courses on insect transmission of plant disease agents.
Light Emission by Plants and Bacteria
Light Emission by Plants and Bacteria deals mainly with light coming from plants and bacteria as a result of various different reactions. This book emphasizes the light emission from photosynthetic organisms. The major aim of this book is to give insight on light emission studies in plant and bacteria in terms of its physiological, biophysical, and biochemical relevance. The book is divided into six parts. Part I serves as an introduction and at the same time a historical review and development of different concepts of the emission phenomena. Part II tackles the relationship of light emission to the various photosynthetic reactions. Part III discusses the concept of bioluminescence, with a focus on bacteria and dinoflagellates. Part IV is a description of the light emission from bacteriorhodopsin and rhodopsin. Part V discusses the special light emission characteristics and their relationship to specialized pigment systems found in different bacteria and plant groups. It also reviews the fluorescence properties of photosynthetic bacteria. Lastly, Part VI basically shows the practical applications of light emission from algae as well as higher plants. This book contains not only relevant information about theories and concepts, but also experiments. Thus, it is a recommended reference to researchers and students alike in the field of cell biology, microbiology, plant physiology, biochemistry, biophysics, and agriculture.
Low Temperature Stress in Crop Plants
Low Temperature Stress in Crop Plants: The Role of the Membrane contains the proceedings of an international seminar on ""Low Temperature Stress in Crop Plants"" held at the East-West Center, Honolulu, Hawaii, March 26-30, 1979. Organized into five parts, this book focuses on the fundamental mechanisms involved in the temperature response of crop plants. It examines the hypotheses related to the primary temperature sensor in crop plants and the mechanisms of low temperature injury. It also explores the genetic potential for cold resistance. Special topics related to the utilization of Arrhenius plots of the temperature response of plants are also discussed.
Ludwig’s Applied Process Design for Chemical and Petrochemical Plants
"This complete revision of Applied Process Design for Chemical and Petrochemical Plants, Volume 1 builds upon Ernest E. Ludwigs classic text to further enhance its use as a chemical engineering process design manual of methods and proven fundamentals. This new edition includes important supplemental mechanical and related data, nomographs and charts. Also included within are improved techniques and fundamental methodologies, to guide the engineer in designing process equipment and applying chemical processes to properly detailed equipment.All three volumes of Applied Process Design for Chemical and Petrochemical Plants serve the practicing engineer by providing organized design procedures, details on the equipment suitable for application selection, and charts in readily usable form. Process engineers, designers, and operators will find more chemical petrochemical plant design data in:Volume 2, Third Edition, which covers distillation and packed towers as well as material on azeotropes and ideal/non-ideal systems.Volume 3, Third Edition, which covers heat transfer, refrigeration systems, compression surge drums, and mechanical drivers.A. Kayode Coker, is Chairman of Chemical & Process Engineering Technology department at Jubail Industrial College in Saudi Arabia. Hes both a chartered scientist and a chartered chemical engineer for more than 15 years. and an author of Fortran Programs for Chemical Process Design, Analysis and Simulation, Gulf Publishing Co., and Modeling of Chemical Kinetics and Reactor Design, Butterworth-Heinemann. Key Features. Provides improved design manuals for methods and proven fundamentals of process design with related data and charts. Covers a complete range of basic day-to-day petrochemical operation topics with new material on significant industry changes since 1995."
Marschner’s Mineral Nutrition of Higher Plants: Third Edition 2012
"An understanding of the mineral nutrition of plants is of fundamental importance in both basic and applied plant sciences. The Third Edition of this book retains the aim of the first in presenting the principles of mineral nutrition in the light of current advances. This volume retains the structure of the first edition, being divided into two parts: Nutritional Physiology and Soil-Plant Relationships. In Part I, more emphasis has been placed on root-shoot interactions, stress physiology, water relations, and functions of micronutrients. In view of the worldwide increasing interest in plant-soil interactions, Part II has been considerably altered and extended, particularly on the effects of external and interal factors on root growth and chapter 15 on the root-soil interface. The third edition will be invaluable to both advanced students and researchers. Key Features. Third Edition of this established text. Structure of the book remains the same. 50% of the reference and 50% of the figures and tables have been replaced. Whole of the text has been revised. Coverage of plant (soil interactions has been increased considerably)"
Matthews’ Plant Virology
It has been ten years since the publication of the third edition of this seminal text on plant virology, during which there has been an explosion of conceptual and factual advances. The fourth edition updates and revises many details of the previous editon, while retaining the important older results that constitute the field's conceptual foundation. Key Features @introbul:Key features of the fourth edition include: @bul:* Thumbnail sketches of each genera and family groups * Genome maps of all genera for which they are known * Genetic engineered resistance strategies for virus disease control * Latest understanding of virus interactions with plants, including gene silencing * Interactions between viruses and insect, fungal, and nematode vectors * New plate section containing over 50 full-color illustrations
Measurement Techniques in Plant Science
"Any explanation of the physiological ecology of plant growth--why plants survive in particular environments--requires the measurement of the effects of environmental factors. This book reviews the history, development, and current status of instruments and measurement techniques that have been particularly useful in field studies of plant physiological ecology. It will be of interest to researchers and students in plant physiology and biochemistry, crop scientists, horticulturalists, and foresters. Key Features. Miniaturized, portable gas exchange measurement systems. Permanent field installation for transportationo measurements. Automated plant-water sensing system. Use of chlorophyll fluorescence for screening of tolerant genotypes"
Methods for Plant Molecular Biology
Methods for Plant Molecular Biology is a collection of articles that focuses on the techniques used in plant molecular biology and genetics. The book discusses the isolation and characterization of nuclear, chloroplast, and mitochondrial nucleic acids and the factors and systems involved in transcription and gene expression. Procedures for the isolation of cell walls, chloroplast membranes, membrane proteins; techniques to carry out plant cell culture and protoplast formation; and methods for gene and organelle transfer are covered as well. Biologists, molecular biologists, botanists, and students will find the book very useful.
Methods in Plant Molecular Biology
"Methods in Plant Molecular Biology is a lab manual that introduces students to a diversity of molecular techniques needed for experiments with plant cells. Those included have been perfected and are now presented for the first time in a usable and teachable form. Because the manual integrates protein, RNA, and DNA techniques, it will serve students, teachers, and researchers in plant physiology, biophysics, and animal molecular biology who have no previous experience handling recombinant DNA or purified proteins. It can also be used by the established molecular biologist who wishes to utilize the powerful techniques of recombinant DNA to explore the mysteries of the plant kingdom. Key Features. Eight basic experiments which can be used collectively or individually cover. Recombinant Cloning and Screening in E. coli; DNA Sequencing. Plant RNA Isolation and in Vitro Translations. Plant DNA Isolations and Genomic DNA Southern AnalysisChloroplast Isolation and Protein SynthesisPlant Tissue Culture and Agrobacterium Transformations. Experiments that have been student tested for three years. Blueprints for setting up gel rigs. Comprehensive course schedule outlining individual procedures to be finished in each lab segment. Course can be tailored to suit the needs of the individual instructor"
Microbiology of Aerial Plant Surfaces
Microbiology of Aerial Plant Surfaces is composed of papers presented at a meeting held at the University of Leeds in September, 1975. The content covers progress in work on the aerial surfaces of plants during the years 1970-1975. Organized into 31 chapters, the book begins with the aspects of the structure and development of the aerial surfaces of higher plants. It then elucidates some effects of fungicides and other agrochemicals on the microbiology of the aerial surfaces of plants; effects of air pollution on the structure and function of plant-surface microbial ecosystems; and the aerial microclimate around plant surfaces. Some other topics discussed include the taxonomy of bacteria on the aerial parts of plants; fungi on the aerial surfaces of higher plants; and distribution of yeasts and yeast-like organisms on aerial surfaces of developing apples and grapes. Furthermore, the book explains the saprophytes on plant surfaces in maritime areas and antagonism between fungal saprophytes and pathogens on aerial plant surfaces.
Mineral Salts Absorption in Plants
Mineral Salts Absorption in Plants details the contemporary knowledge regarding the mineral salt absorption mechanisms of plants. The title first covers the history of mineral salt absorption in plants, and then proceeds to tackling the experimental materials and methods. Next, the selection discusses the mechanisms of ion transport. Chapter 4 deals with the factors affecting salt absorption, while Chapter 5 talks about salt absorption and metabolisms. In the sixth chapter, the text covers the structural aspects of salt absorption in cells. The seventh chapter discusses the salts relations of vascular plants. The selection also talks about the soil as a source of mineral salts, along with salt tolerance. The book will be of great use to botanists and horticulturists. Students and researchers in the field of mineral nutrition will also benefit from the text.
Mitochondria in Higher Plants
Mitochondria in Higher Plants: Structure, Function, and Biogenesis is a collection and interpretation of information on plant mitochondria. It explains not only the basic enzymology of ATP synthesis coupled to electron transport that seems to constitute the major activity of the mitochondria, but also many other aspects that make plant mitochondria rather more diverse than their animal counterparts. Organized into five chapters, this book begins with the morphological and cytological observations on mitochondria, and proceeding through membrane and matrix functions to participation in metabolism and biogenesis. Each section presents the unique properties of plant mitochondria within the framework of general mitochondrial structure and function. This book is intended not only for research workers and students interested in the enzymology of plant mitochondria respiration, but also for graduate and undergraduate students in the field of plant biochemistry, cell physiology, and molecular biology. It will be useful as a starting point for those students wishing to pursue special studies in this field.
Molecular Biology of Plant Nuclear Genes
Cell Culture and Somatic Cell Genetics of Plants, Volume 6: Molecular Biology of Plant Nuclear Genes focuses on the spectacular and rapid advances in the molecular biology and genetics of plants. This book consists of 19 chapters. Chapters 1 to 5 describe the most commonly used approaches for the genetic transformation of plants. The light-inducible and tissue-organ-specific genes are discussed in Chapters 6 to 11. In Chapters 12 to 14, the genes regulating phytohormone synthesis, heat shock proteins, and nodulation in legume roots are treated, while in Chapters 15 to 16, the relationship between chromatin structure and gene expression and molecular biology of plant RNA viruses are analyzed. The development of transgenic plants resistant to viruses, insects, and herbicides is dealt with in the last three chapters. This volume is suitable for plant molecular biologist, genetic engineers, and researchers concerned with plant cell and tissue culture.
Molecular Biology of Plant Tumors
Molecular Biology of Plant Tumors provides an opportunity to learn in detail about the latest insights into the mechanism of transformation of plant cells by Agrobacterium tumefaciens. The study of the molecular mechanism responsible for the crown gall phenomenon (induced by Agrobacterium tumefaciens) illustrates the point that the fundamental study of the cause(s) and mechanism(s) of abnormal growth might be one of the most efficient ways to understand cellular differentiation and the molecular basis of gene expression. The book is organized into three parts that contain research on abnormal plant growth, crown gall tumors, and potential vectors for genetic engineering in agriculture. The genetic structure responsible for the neoplasmic transformation of plant cells in crown galls is a bacterial plasmid (called Ti for tumor-inducing). Research described in this volume demonstrates that these Ti plasmids were designed by evolution as natural gene vectors with which some bacteria can introduce active genes into plants. These transferred genes are maintained by integration in the plant genome and their expression is directly or indirectly responsible for the tumorous growth pattern.