Download or read book Pollen Clumping and Release Mechanisms in Wind Pollinated Plants written by David Timerman and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pollination Mechanisms Reproduction and Plant Breeding written by R. Frankel and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: view than its own proper males should fecundate each blossom." ANDREW KNIGHT Philosophical Transactions, 1799 Pollination mechanisms and reproduction have a decisive bearing upon rational procedures in plant breeding and crop production. This book intends to furnish' under one cover an integrated botanical, genetical and breeding-methodologi cal treatment of the reproductive biology of spermatophytes mainly angiosperms; it is based on an advanced topical course in plant breeding taught at the Hebrew University of Jerusa lem. We have tried to present a coverage which is concise, but as comprehensive as possible, of the pollination mechanism and modes of reproduction of higher plants, and to illustrate topics, whenever practicable, by examples from cultivated plants. Nevertheless, some relevant publications may have escaped our attention or may not be mentioned because of various limitations. The book is organized into three parts. The first part starts with an evaluation of the significance of the different pollination mechanisms for plant breeding and crop produc tion, describes modes of reproduction in higher plants and discusses ecology and dynamics of pollination. The second part is devoted to crops propagated by self pollination and describes specific breeding procedures for such crops. The third part details sexual reproduction in higher plants and handles three mechanisms involved in the prevention of self pollination and their utilization in plant breeding: sex expres sion, incompatibility, and male sterility.
Download or read book Pollen and Pollination written by Amots Dafni and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pollen studies make important contributions nature, into three main themes: pollen struc to our knowledge in many interdisciplinary ture and constituents, pollen evolutionary arenas. Pollen identification is widely used in ecology and the pollen-pollinator interface. reconstruction of, e.g., vegetation, the climate Several papers overlap somewhat or are of the past, and plant biodiversity. Studies perhaps even somewhat contradictory and concerning pollen structure, size and form are reflect the author's own ideas and experience. key issues in basic sciences, as, e.g., plant Some could be understood more deeply by taxonomy and evolution, but are also of consulting other closely related articles. The importance in applied fields as, e.g., plant reader is strongly referred to the respective breeding. In pollination studies pollen is literature list of each article. generally used specifically to identify food ofanther ripening and pollen The last steps development (Pacini) and the mature pollen sources of visitors and to reconstruct their foraging routes. Fewer have been devoted to wall structure (Hesse) are key factors to pollen collection mechanisms and to the struc understand pollen dispersal mechanisms in ture and content of pollen in relation to its biotic pollination (Stroo) as well as abiotic pollination (Ackerman). Pollen size, shape, function.
Download or read book Paleoethnobotany Third Edition written by Deborah M Pearsall and published by Left Coast Press. This book was released on 2015-09 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of the definitive work on doing paleoethnobotany brings the book up to date by incorporating new methods and examples of research, while preserving the overall organization and approach of the book to facilitate its use as a textbook. In addition to updates on the comprehensive discussions of macroremains, pollen, and phytoliths, this edition includes a chapter on starch analysis, the newest tool in the paleoethnobotanist's research kit. Other highlights include updated case studies; expanded discussions of deposition and preservation of archaeobotanical remains; updated historical overviews; new and updated techniques and approaches, including insights from experimental and ethnoarchaeological studies; and a current listing of electronic resources. Extensively illustrated, this will be the standard work on paleoethnobotany for a generation.
Download or read book Paleoethnobotany written by Deborah M Pearsall and published by Routledge. This book was released on 2016-06-16 with total page 1161 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new edition of the definitive work on doing paleoethnobotany brings the book up to date by incorporating new methods and examples of research, while preserving the overall organization and approach of the book to facilitate its use as a textbook. In addition to updates on the comprehensive discussions of macroremains, pollen, and phytoliths, this edition includes a chapter on starch analysis, the newest tool in the paleoethnobotanist's research kit. Other highlights include updated case studies; expanded discussions of deposition and preservation of archaeobotanical remains; updated historical overviews; new and updated techniques and approaches, including insights from experimental and ethnoarchaeological studies; and a current listing of electronic resources. Extensively illustrated, this will be the standard work on paleoethnobotany for a generation.
Download or read book Principles of Horticulture Level 3 written by Charles Adams and published by Routledge. This book was released on 2015-03-24 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: This colourful guide will explain the fundamentals of growing plants, whether you are taking a Level 3 RHS, City and Guilds or Edexcel course, are a grower or gardener in the industry, or are just a keen amateur. Written in a clear and accessible style, this book covers the principles that underpin plant production, the use of growing media and crop protection, but with reference also to the same practices in the garden or allotment. With highlighted definitions, key points, and illustrated in full colour, this book will be a useful companion as you progress in the study and practice of horticulture. Complete with a companion website which includes extended horticultural information, questions and exercises to test your knowledge, syllabus cross-referencing and downloadable tutor and student support materials.
Download or read book Plant Biomechanics written by Karl J. Niklas and published by University of Chicago Press. This book was released on 1992-08 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, the author analyzes plant form and how it has evolved in response to basic physical laws. He examines the ways these laws limit the organic expression of form, size, and growth in a variety of plant structures and in plants as whole organisms, drawing on both the fossil record and studies of extant species.
Download or read book The Ecology and Evolution of Wind Pollination written by Jannice Friedman and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The evolution of wind pollination (anemophily) has occurred at least 65 times in the flowering plants and over 10% of angiosperm species are wind pollinated. However the pollination and mating of anemophily species is poorly understood, particularly in comparison with animal-pollinated species. My thesis employs a range of approaches and tools to examine the evolution and ecology of wind pollination. These include comparative analyses, theoretical modeling, field and glasshouse experiments, the use of genetic markers and quantitative genetics. Experimental studies on diverse taxa were used to address questions concerned with the efficacy of outcrossing mechanisms, the ecological and demographic context of pollination and mating, and the plasticity of sex allocation.Comparative analyses indicated that wind pollination is correlated with unisexual flowers, reduced ovule number, small unshowy flowers, an absence of nectar, and open habitats. These analyses also demonstrated that anemophily originates more often in lineages with unisexual flowers. This suggests that wind pollination evolves in diclinous taxa as a mechanism of reproductive assurance because autonomous selfing is mechanically precluded. Empirical data on stigmatic pollen loads in 19 anemophilous species challenge the widespread assumption that anemophilous plants commonly have uniovulate flowers because they capture few pollen grains. Further, a model based on floral costs and the aerodynamics of pollen capture demonstrated that when flowers are inexpensive it is optimal to produce many flowers each with few ovules, because this allows more efficient sampling of the airstream. Manipulative field experiments on seven Carex species indicated that neither monoecy nor protogyny, two putative outcrossing mechanisms, are effective at limiting selfing. Based on these results I suggest that geitonogamy can provide reproductive assurance in anemophilous species with unisexual flowers. Field experiments and the application of sex-specific markers in Rumex nivalis revealed that the local neighbourhood of maternal plants affects pollination intensity and progeny sex ratios. Finally, I demonstrated that plant density in Ambrosia artemisiifolia affects stigmatic pollen loads but not outcrossing rates. Through a quantitative genetics experiment in A. artemisiifolia, I detected significant genetic variation for plasticity in sex allocation, potentially enabling adaptive adjustment of sex allocation to local environmental conditions.
Download or read book Diffusion and Ecological Problems Modern Perspectives written by Akira Okubo and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surveying a wide variety of mathematical models of diffusion in the ecological context, this book is written with the primary intent of providing scientists, particularly physicists but also biologists, with some background of the mathematics and physics of diffusion and how they can be applied to ecological problems. Equally, this is a specialized text book for graduates interested in mathematical ecology -- assuming no more than a basic knowledge of probability and differential equations. Each chapter in this new edition has been substantially updated by appopriate leading researchers in the field and contains much new material covering recent developments.
Download or read book The Pollination of Flowers written by Michael Proctor and published by . This book was released on 1973 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pollen and Spores written by Ian Keith Ferguson and published by . This book was released on 1986 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evolution of Wind pollination in Fraxinus Oleaceae written by Eva Wallander and published by . This book was released on 2001 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Biology of Pollen written by Patrick Echlin and published by . This book was released on 1970 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biomechanical and Ecological Insights on Evolutionary Transitions from Animal to Wind Pollination in Flowering Plants written by David Timerman and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind pollination (anemophily) has evolved from animal pollination (zoophily) at least 65 times among angiosperm lineages and is associated with a characteristic syndrome of floral traits, probably reflecting convergent adaptation to aerodynamically driven processes. In this thesis, I investigated the floral trait modifications promoting wind pollination, their fitness effects in contrasting environments, and the evolutionary significance of ambophily, in which both wind and insect pollination occur. I focused on traits promoting pollen release in air because it is the critical first stage of wind pollination and is constrained in most zoophilous taxa. I begin by reviewing the aerodynamic principles governing pollen release to identify likely targets of selection for anemophily. I then performed a comparative biomechanical analysis of pollen release using Thalictrum (Ranunculaceae), an herbaceous genus with multiple independent transitions between pollen vectors. I demonstrated that turbulence-induced vibration of stamens is the primary mechanism of pollen release, and is more likely to occur in species with lower natural frequencies, an intrinsic property of materials in which length and mass vary inversely. I also investigated intraspecific variation in natural frequency and its effects on fitness in dioecious ambophilous T. pubescens. I detected heritable population differences in natural frequency and thus pollen release, and demonstrated using field experiments that selection favours lower natural frequencies when pollinators limit seed set. I then investigated the evolutionary stability of ambophily in T. pubescens by evaluating how variation in density and sex ratio affects pollination success through animal versus wind pollination. I demonstrated that fitness losses resulting from declining pollinator service are offset by wind pollination suggesting that the reproductive flexibility provided by ambophily may be adaptive in populations facing demographic uncertainty. Finally, I examined factors causing male-biased sex ratios in T. pubescens. Several lines of evidence indicated that the bias is likely established early in the life cycle, perhaps at the seed stage, perhaps reflecting an adaptive bias of the primary sex ratio. My thesis provides novel results and insights on the biomechanics of wind pollination and the microevolutionary processes operating during the early stages in the transition from animal to wind pollination.
Download or read book A Field Guide to Rocky Mountain and Southwest Forests written by John C. Kricher and published by Houghton Mifflin Harcourt. This book was released on 1998 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive field guide includes all the flora and fauna you're most likely to see in the forest communities of the Rocky Mountains and the Southwest. It includes 53 color plates and more than 80 color photos illustrating trees, birds, mammals, wildflowers, mushrooms, reptiles and amphibians, butterflies, beetles, and other insects.
Download or read book Beekeeping A Compressive Guide to Bees and Beekeeping written by D.P. Abrol and published by Scientific Publishers. This book was released on 2013-07-01 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book shall serve as a reference book for students, teachers, and researchers and for all those interested in bees and beekeeping. This book will be useful to all those who wish to make beekeeping their hobby or as profession, entrepreneurs and even layman. Besides, the information provided in this book will be useful to pollination biologists, students, teachers, scientists of agriculture, animal behaviour, botany, conservation, biology, ecology, entomology, environmental biology, forestry, genetics, plant breeding, horticulture, toxicology, zoology, seed growers and seed agencies. It will be highly useful to motivate the young generation to fascinating world of honeybees and adopt beekeeping as a profession. Book as a guide for their problems & evolving strategies.
Download or read book Embryology of Flowering Plants Terminology and Concepts Vol 3 written by T B Batygina and published by CRC Press. This book was released on 2019-04-23 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plant embryology, dealing with the regularities of initiation and the first stages of development of an organism, is now flourishing because of the overall progress being made in natural sciences. Such discoveries of the 20th century as production of plants from a single somatic cell, experimental haploidy, and parasexual hybridization were of general biological significance. The combined efforts of embryologists, geneticists and molecular biologists yielded the discovery of specific genes that control meiosis, egg cell development and early stages of embryogenesis. The tendency to synthesize data of embryology and genetics has become increasingly noticeable. It is connected with the fact that the majority of problems connected with morphogenesis, such as differentiation, specialization, the evaluation of features and the definition of the notionsgene and feature andgenotype and phenotype concern embryology and genetics (embryogenetics) in one way or another. Evolutionary embryology has given rise to a new approach to the study of problems of adaptation in plants. In connection with the problem of preserving biological diversity under conditions of ecological stress, special attention is paid to ecological embryology, revealing the critical periods in early ontogenesis and plasticity and tolerance of reproductive systems at the level of species and population. The study of variability of morphogenesis and phenotype in population (life cycle variations and the diversity of reproductive systems) is the most important point in the population embryology of plants.
