Determination of Heterotic Patterns for in Vitro Pollen-tube Length Among Diverse Alfalfa Sources PDF Download

Author: Dan Michael Froehlich
Publisher:
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Category :
Languages : en
Pages : 124

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Category : Dissertations, Academic
Languages : en
Pages : 486

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Category : Agronomy
Languages : en
Pages : 324

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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 798

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Category : Dissertation abstracts
Languages : en
Pages : 540

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Category : Agriculture
Languages : en
Pages : 622

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Sept.-Oct. issue includes list of theses and dissertations for U.S. and Canadian graduate degrees granted in crop science, soil science, and agronomic science during the previous academic year.

Author: University of Minnesota
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 536

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Author: David L. Mulcahy
Publisher: Springer
ISBN: 9781461386247
Category : Technology & Engineering
Languages : en
Pages : 0

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In Recognition of the Forgotten Generation D. L. MULCAHyl Pollen was long believed to serve primarily a single function, that of delivering male gametes to the egge A secondary and generally overlooked value of pollen is that it serves to block the transmission of many defective alleles and gene combinations into the next generation. This latter function comes about simply because pollen tubes carrying defective haploid genotypes frequently fail to complete growth through the entire length of the style. However, the beneficial consequences of this pollen selection are diluted by the fact that the same deleterious genotypes are often transmitted through the egg at strictly mendelian frequencies (Khush, 1973). Gene expression in the pollen might thus at least appear to be a phenomenon of trivial consequence. Indeed, Heslop-Harrison (1979) rightly termed the gametophytic portion of the angiosperm life cycle, the "forgotten generation." This neglect, however, came about despite subtle but constant indications that pollen is the site of intense gene activity and selection. For example, Mok and Peloquin (1975) demonstrated that relatively heterozygous diploid pollen shows heterotic characteristics whereas relatively homozygous diploid pOllen does not. This was proof positive that genes are expressed (that is, transcribed and translated) in the pollen. 1 Department of Botany, University of Massachusetts Amherst, MA 01003, USA viii However, the implications for pollen biology of even this recent and well known study were not widely recognized.

Author: Rodomiro Ortiz Ríos
Publisher: Springer
ISBN: 3319205323
Category : Science
Languages : en
Pages : 250

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​The field of plant breeding has grown rapidly in the last decade with breakthrough research in genetics and genomics, inbred development, population improvement, hybrids, clones, self-pollinated crops, polyploidy, transgenic breeding and more. This book discusses the latest developments in all these areas but explores the next generation of needs and discoveries including omics beyond genomics, cultivar seeds and intellectual and property rights. This book is a leading-edge publication of the latest results and forecasts important areas of future needs and applications.​

Author: Vernonica E. Franklin-Tong
Publisher: Springer Science & Business Media
ISBN: 3540684867
Category : Science
Languages : en
Pages : 341

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Great progress has been made in our understanding of pollen-pistil interactions and self-incompatibility (SI) in flowering plants in the last few decades. This book covers a broad spectrum of research into SI, with accounts by internationally renowned scientists. It comprises two sections: Evolution and Population Genetics of SI, Molecular and Cell Biology of SI Systems. The reader will gain an insight into the diversity and complexity of these polymorphic cell-cell recognition and rejection systems. Heteromorphic and homomorphic SI systems and our current understanding of the evolution and phylogeny of these systems, based on the most recent molecular sequence data, are covered. Further, the book presents major advances in our knowledge of the pistil and pollen S-determinants and other unlinked components involved in SI, as well as the apparently diverse cellular regulatory mechanisms utilised to ensure inhibition of “self” pollen.