Semi in Vitro Pollen Tube Growth in Alfalfa, Medicago Sativa L PDF Download
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Author: Jerry Ray Hensley
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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Author: Jerry Ray Hensley
Publisher:
ISBN:
Category :
Languages : en
Pages : 46
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Author: Colleen Ann Mulinix
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Category : Alfalfa
Languages : en
Pages : 182
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Author: Marvin Kay Miller
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Category : Alfalfa
Languages : en
Pages : 144
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Author: Dan Michael Froehlich
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Category :
Languages : en
Pages : 124
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Author: University of Illinois at Urbana-Champaign. Agricultural Experiment Station
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Category : Agriculture
Languages : en
Pages : 900
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Author: University of Illinois at Urbana-Champaign. Agricultural Experiment Station
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Category : Agriculture
Languages : en
Pages : 2200
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Author:
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Category : Plant breeding
Languages : en
Pages : 1212
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Author:
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Category : Agriculture
Languages : en
Pages : 308
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Includes abstracts of the annual meetings of the American Society of Agronomy; Soil Science Society of America; Crop Science Society of America ( - of its Agronomic Education Division).
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.
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Category : Agriculture
Languages : en
Pages : 558
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