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Author: David L. Mulcahy Publisher: Springer Science & Business Media ISBN: 1461386225 Category : Technology & Engineering Languages : en Pages : 532
Book Description
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: David L. Mulcahy Publisher: Springer Science & Business Media ISBN: 1461386225 Category : Technology & Engineering Languages : en Pages : 532
Book Description
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: David L. Mulcahy Publisher: ISBN: 9783540962670 Category : Biotechnology Languages : en Pages : 0
Book Description
In ruim 75 internationale bijdragen worden recente onderzoekswaarnemingen weergegeven o.a. in verband met het gemeenschappelijke karakter van gametofytische en sporofytische genotypen (nl. een groot deel van de structuurgenen bij bloeiende planten blijkt ook in stuifmeel voor te komen en wordt daardoor bepaald door haploide-selectie). De bijdragen zijn gerangschikt naar de hoofdonderwerpen: genen in stuifmeel, stuifmeel in de biotechnologie, zelf-incompatibiliteit en interacties tussen stuifmeel en stijl, stuifmeelultrastructuur en -ontwikkeling, stuifmeelfysiologie en -metabolisme, gametofytische ecologie
Author: K R Shivanna Publisher: CRC Press ISBN: 0429530412 Category : Science Languages : en Pages : 381
Book Description
The author offers an overview of pollen biology and biotechnology for students and researchers in areas such as reproductive biology, biotechnology, aeropalynology, plant breeding, horticulture, and forestry. Citing more than 1,500 references to pollen research, the text covers topics including advances in understanding pollen tube growth, the use
Author: Shyam S. Mohapatra Publisher: Springer Science & Business Media ISBN: 1475702353 Category : Science Languages : en Pages : 299
Book Description
The last decade has seen tremendous progress in our knowledge of the pollen development and gene expression on one hand and the characterization of pollen specific proteins on the other. In compiling the chapters for this volume, we have pragmatically categorized these basic developments in pollen molecular biology and biotechnology into two sections based on their applications in agricul ture and implications in medicine. Pollen developmental biology and gene expression: applications in agricul ture. Pollen development is an extremely complex process encompassing a series of biochemical, physiological and genetic events. At the basic level, sporophyt ically expressed genes may expound our knowledge of unique processes of cellular differentiation which ultimately give rise to a full-fledged organism. At the applied level, the studies on the pollen and male sporophyte-specific gene expression, and of promoters and transcription factors of relevant genes have the potential to manipulate the fertility in certain cash crops leading to agricultural biotechnology.
Author: Shyam S. Mohapatra Publisher: Springer ISBN: 9781475702361 Category : Science Languages : en Pages : 288
Book Description
The last decade has seen tremendous progress in our knowledge of the pollen development and gene expression on one hand and the characterization of pollen specific proteins on the other. In compiling the chapters for this volume, we have pragmatically categorized these basic developments in pollen molecular biology and biotechnology into two sections based on their applications in agricul ture and implications in medicine. Pollen developmental biology and gene expression: applications in agricul ture. Pollen development is an extremely complex process encompassing a series of biochemical, physiological and genetic events. At the basic level, sporophyt ically expressed genes may expound our knowledge of unique processes of cellular differentiation which ultimately give rise to a full-fledged organism. At the applied level, the studies on the pollen and male sporophyte-specific gene expression, and of promoters and transcription factors of relevant genes have the potential to manipulate the fertility in certain cash crops leading to agricultural biotechnology.
Author: Christophe Clement Publisher: Springer Science & Business Media ISBN: 3642599850 Category : Science Languages : en Pages : 264
Book Description
Pollen, the plant structure most widely used by humans, is a key structure in plant reproduction giving rise to fruits and seeds. Moreover, the biotechnological use of pollen is of great importance for plant breeders since it allows to obtain varieties with better utilization and yield. In the first part, the successive steps of pollen development in the anther from floral induction to pollen germination and fertilization are thoroughly examined; the second part is devoted to pollen behaviour in vitro.
Author: K. R. Shivanna Publisher: Cambridge University Press ISBN: 052147180X Category : Science Languages : en Pages : 464
Book Description
Here, for the first time in a single volume, are all the ideas and techniques developed in the last two decades concerning the manipulation of pollen and pollen tubes in plant breeding and biotechnology.
Author: K.R. Shivanna Publisher: Springer Science & Business Media ISBN: 3642773060 Category : Technology & Engineering Languages : en Pages : 123
Book Description
Pollen grains are everywhere - in the air, in the water, in soil and in the food we eat. Pollen has direct relevance in agriculture, horticulture, plant breeding, crop improvement and biotechnology. They are further of use for montioring cytotoxic effects - by herbicides, pesticides and pollutants - testing for allergic reactions, and for basic studies on gene expression, research on differentiation and polarity. Detailed instructions of the standard techniques, which have all been tested and improvised by the authors, are given, such as collection and storage of pollen, pollen culture, germination, tests for viability, incompatibility and isolation of protoplasts. Introduced by an explanation of the principles involved, the step-by step protocols are complemented by personal notes and precautions, specifying the reagents used and various appendices on basic and specific requirements for laboratory exercises on pollen.
Author: David L. Mulcahy
Author: David L. Mulcahy
Author: D. L. Mulcahy
Author: David L. Mulcahy
Author: K R Shivanna
Author: Shyam S. Mohapatra
Author: Shyam S. Mohapatra
Author: Christophe Clement
Author: K. R. Shivanna
Author: K. R. Shivanna
Author: K.R. Shivanna