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Author: August Weismann
Publisher:
ISBN:
Category : Genetics
Languages : en
Pages : 524
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Book Description
Author: August Weismann
Publisher:
ISBN:
Category : Genetics
Languages : en
Pages : 524
Get Book Here
Book Description
Author: Y. P. S. Bajaj
Publisher: Springer Science & Business Media
ISBN: 3662030969
Category : Technology & Engineering
Languages : en
Pages : 526
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Book Description
The germ plasm of numerous plant species, especially those of forest trees, some agricultural crops, and medicinal plants, is endangered and threatened with extinction. This depletion of germplasm pools and the shrinkage of naturally occurring genetic resources have caused international concern. Conventionally, the germplasm of plants is conserved through seeds, tubers, roots, corms, rhizomes, bulbs, cuttings, etc. However, the germ plasm of a number of trees and plantation crops (such as coconut, cocao, coffee, oil palm, rubber, mango, horse chestnut, etc. ) cannot be preserved since their seed are short-lived (recalcitrant). Likewise, germplasm of vegetatively propagated crops (such as potato and cassava) cannot be stored on a long term basis and has to be grown and multiplied periodically in nurseries and fields. The plants are thus exposed to unpredictable weather conditions and diseases, with the result that instances are known where entire genetic stocks are lost. Therefore, unconventional methods are being developed for the storage and international exchange of germplasm. For this purpose in vitro cultures have been employed, but they can only enable short-to medium term preservation; moreover, cell cultures upon repeated subculture undergo genetic erosion. In view of the recent developments in the in vitro induction of genetic variability through somaclonal variation, somatic hybridization, recombinant DNA technology, etc. , new methods need to be employed for the storage of desirable cultures. In this regard freeze preservation of cells in liquid nitrogen (-196 0q, like that of semen, enables long-term storage, theoretically, for an indefinite period of time.
Author: Frederick B. Churchill
Publisher: Harvard University Press
ISBN: 0674736893
Category : Biography & Autobiography
Languages : en
Pages : 723
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Book Description
The evolutionist Ernst Mayr considered August Weismann “one of the great biologists of all time.” Yet the man who formulated the germ plasm theory—that inheritance is transmitted solely through the nuclei of the egg and sperm cells—has not received an in-depth historical examination. August Weismann reintroduces readers to a towering figure in the life sciences. In this first full-length biography, Frederick Churchill situates Weismann in the swirling intellectual currents of his era and demonstrates how his work paved the way for the modern synthesis of genetics and evolution in the twentieth century. In 1859 Darwin’s tantalizing new idea stirred up a great deal of activity and turmoil in the scientific world, to a large extent because the underlying biological mechanisms of evolution through natural selection had not yet been worked out. Weismann’s achievement was to unite natural history, embryology, and cell biology under the capacious dome of evolutionary theory. In his major work on the germ plasm (1892), which established the material basis of heredity in the “germ cells,” Weismann delivered a crushing blow to Lamarck’s concept of the inheritance of acquired traits. In this deeply researched biography, Churchill explains the development of Weismann’s pioneering work based on cytology and embryology and opens up an expanded history of biology from 1859 to 1914. August Weismann is sure to become the definitive account of an extraordinary life and career.
Author: Melanie Walton
Publisher: Nova Science Publishers
ISBN: 9781536103366
Category : Nature
Languages : en
Pages : 0
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Book Description
The need for germplasm banks that safeguard the vegetable genetic resources is more than justified by the genetic erosion aggravated in the last few decades, not only in the cultivars, but also in traditional landraces and wild relatives. Topics discussed in this book include the germplasm of melons, woodland grapes, sweet and sour cherries, soybean, and an alternative tool for the germplasm conservation in wild mammals.
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309131863
Category : Technology & Engineering
Languages : en
Pages : 476
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Book Description
This anchor volume to the series Managing Global Genetic Resources examines the structure that underlies efforts to preserve genetic material, including the worldwide network of genetic collections; the role of biotechnology; and a host of issues that surround management and use. Among the topics explored are in situ versus ex situ conservation, management of very large collections of genetic material, problems of quarantine, the controversy over ownership or copyright of genetic material, and more.
Author: Jim F. Hancock
Publisher: Springer Science & Business Media
ISBN: 1402069073
Category : Science
Languages : en
Pages : 459
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Book Description
This book fully integrates the conventional and biotechnological approaches to fruit crop breeding. Individual chapters are written on a wide variety of species covering all the major fruit crops in one volume. For each crop, there is a discussion of their taxonomy and evolution, history of improvement, crossing techniques, evaluation methods, and heritability of major traits and germplasm resources. Also discussed are the most recent advances in genetic mapping and QTL (quantitative trait loci) analysis, marker assisted breeding, gene cloning, gene expression analysis, regeneration and transformation. Patenting and licensing issues are also covered.
Author: Sarah S. Richardson
Publisher: University of Chicago Press
ISBN: 022654480X
Category : Science
Languages : en
Pages : 319
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Book Description
Leading gender and science scholar Sarah S. Richardson charts the untold history of the idea that a woman's health and behavior during pregnancy can have long-term effects on her descendants' health and welfare. The idea that a woman may leave a biological trace on her gestating offspring has long been a commonplace folk intuition and a matter of scientific intrigue, but the form of that idea has changed dramatically over time. Beginning with the advent of modern genetics at the turn of the twentieth century, biomedical scientists dismissed any notion that a mother—except in cases of extreme deprivation or injury—could alter her offspring’s traits. Consensus asserted that a child’s fate was set by a combination of its genes and post-birth upbringing. Over the last fifty years, however, this consensus was dismantled, and today, research on the intrauterine environment and its effects on the fetus is emerging as a robust program of study in medicine, public health, psychology, evolutionary biology, and genomics. Collectively, these sciences argue that a woman’s experiences, behaviors, and physiology can have life-altering effects on offspring development. Tracing a genealogy of ideas about heredity and maternal-fetal effects, this book offers a critical analysis of conceptual and ethical issues—in particular, the staggering implications for maternal well-being and reproductive autonomy—provoked by the striking rise of epigenetics and fetal origins science in postgenomic biology today.
Author: Meiliang Zhou
Publisher: Academic Press
ISBN: 0128110074
Category : Science
Languages : en
Pages : 383
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Book Description
Buckwheat Germplasm in the World offers an overview of this globally important crop, including its general characterization and genetic diversity—particularly in Russia, China, India and Eastern Europe. The book presents the latest research on molecular marker development, genetics and phenotype analysis of new wild buckwheat to examine the nutritional values of this pseudocereal crop. Due to its short growth span, ability to grow at high altitudes and the high quality of its protein content, buckwheat is considered an important crop for addressing global food needs. Ideal for researchers and advanced-level students seeking better understanding of the buckwheat germplasm. - Summarizes all the reported and distributed buckwheat species in the world - Offers researchers the ability to exchange resources with each other to breed new cultivars - Classifies buckwheat species based on perennial and annual from their growth span, and self-incompatible or self-compatible from their flower morphology and characterization - Facilitates hybridization of different species
Author: Muhammad Tehseen Azhar
Publisher: Academic Press
ISBN: 0128221704
Category : Technology & Engineering
Languages : en
Pages : 408
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Book Description
Wild Germplasm for Genetic Improvement in Crop Plants addresses the need for an integrated reference on a wide variety of crop plants, facilitating comparison and contrast, as well as providing relevant relationships for future research and development. The book presents the genetic and natural history value of wild relatives, covers what wild relatives exist, explores the existing knowledge regarding specific relatives and the research surrounding them and identifies knowledge gaps. As understanding the role of crop wild relatives in plant breeding expands the genetic pool for abiotic and biotic stress resistance, this is an ideal reference on this important topic. - Provides a single-volume resource to important crops for accessible comparison and research - Explores both conventional and molecular approaches to breeding for targeted traits and allows for expanded genetic variability - Guides the development of hybrids for germplasm with increased tolerance to biotic and abiotic stresses
Author: August Weismann
Publisher:
ISBN:
Category : Evolution
Languages : en
Pages : 498
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Book Description
