Download or read book Biotechnology and Ecology of Pollen written by David L. Mulcahy and published by Springer. This book was released on 2011-11-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Plant Evolution and the Origin of Crop Species written by James F. Hancock and published by CABI. This book was released on 2012 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: The genetic variability that developed in plants during their evolution is the basic of their domestication and breeding into the crops grown today for food, fuel and other industrial uses. This third edition of Plant Evolution and the Origin of Crop Species brings the subject up-to-date, with more emphasis on crop origins. Beginning with a description of the processes of evolution in native and cultivated plants, the book reviews the origins of crop domestication and their subsequent development over time. All major crop species are discussed, including cereals, protein plants, starch crops, fruits and vegetables, from their origins to conservation of their genetic resources for future development.
Download or read book Oenothera written by Cornelia Harte and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because of the great variety of problems which this genus presents to biologists, Oenothera belongs to the best-known genera of plants not used economically. This book summarizes today's knowledge of Oenothera's genetics and related fields like caryology and cytogenetics. It is further of great value for all those whose research topics are based on genetics, such as developmental and evolutionary biology.
Download or read book Lost Sex written by Isa Schön and published by Springer Science & Business Media. This book was released on 2009-09-22 with total page 617 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sex is the queen of problems in evolutionary biology. Generations of researchers have investigated one of the last remaining evolutionary paradoxes: why sex exists at all. Given that sexual reproduction is costly from an evolutionary point of view, one could wonder why not all animals and plants reproduce asexually. Dozens of contemporary hypotheses attempt to explain the prevalence of sex and its advantages and predict the early extinction of fully asexual lineages. The major theme of this book is: what is the fate of animal and plant groups in which sex is lost? Initial chapters discuss theory behind asexual life: what major disadvantages do asexual groups have to face, what are the genetic and ecological consequences and what does this theory predict for more applied aspects of asexual life, for example in agricultural pests, diseases as well as in cultural crops such as grapes. Cases studies in many animals (focusing on both invertebrates and vertebrates) and plants reveal parallel, but also singularly novel adaptations to the absence of meiosis and syngamy. And last but not least, are asexuals really doomed to early extinction or do genuine ancient asexuals exist? This book assembles contributions from the most important research groups dealing with asexual evolution in eukaryotes. It is a milestone in research on parthenogenesis and will be useful to undergraduate as well as graduate students and to senior researchers in all fields of evolutionary biology, as the paradox of sex remains its queen of problems.
Download or read book Molecular Markers in Plant Genome Analysis written by Andrew Kalinski and published by DIANE Publishing. This book was released on 1995-07 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: A compilation of 82 annotated bibliographies on Molecular Markers in Plant Genome Analysis. Sponsored by CRIS/ICAR.
Download or read book Evolution of Crop Plants written by N. W. Simmonds and published by . This book was released on 1984 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: Agavaceae; Sisal; Amaranthaceae; Amaranths; Anacardiaceae; Mango; Ceiba; Kapok; Bromeliaceae; Camelliacear; Caracaceae; Chenopodiacear; Compositae; Convoluvaceae; Cruciferae; Cucurbitaceae; Dioscoreaceae; Gramineae; Grossulariaceae; Lauraceae; Leguminosae; Liliaceae; Linaceae; Malcaceae; Moraceae; Musaceae; Myrataceae; Oleaceae; palmae; Pedaliaceae. Piperaceae; Polygonaceae; Rosaceae; Rubiaceae; Rutaceae; Solanaceae. Sterculiaceae; Tiliaceae; Umbelliferae; Vitaceae.
Download or read book Excerpta botanica written by and published by . This book was released on 1966 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biological invaders in inland waters Profiles distribution and threats written by Francesca Gherardi and published by Springer Science & Business Media. This book was released on 2007-08-30 with total page 735 pages. Available in PDF, EPUB and Kindle. Book excerpt: Invasive species have come to dominate 3% of the Earth’s ice-free surface, constituting one of the most serious ecological and economic threats of the new millennium, and freshwater systems are particularly vulnerable. This book examines the identity, distribution, and impact of freshwater non-indigenous species and the dynamics of their invasion. It focuses on old and new invaders and provides a starting point for further research.
Download or read book The Most Important Invasive Plants in Hungary written by Zoltán Botta-Dukát and published by . This book was released on 2008 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flora of the British Isles written by A. R. Clapham and published by CUP Archive. This book was released on 1990-02-08 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: Originally published in paperback in 1990, this book's purpose was the accurate identification of all British plants.
Download or read book Invasive Alien Species of Vascular Plant in Bulgaria written by Ana Petrovna and published by . This book was released on 2013 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stuffed Animals and Pickled Heads written by Stephen T. Asma and published by Oxford University Press. This book was released on 2003-05-01 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: The natural history museum is a place where the line between "high" and "low" culture effectively vanishes--where our awe of nature, our taste for the bizarre, and our thirst for knowledge all blend happily together. But as Stephen Asma shows in Stuffed Animals and Pickled Heads, there is more going on in these great institutions than just smart fun. Asma takes us on a wide-ranging tour of natural history museums in New York and Chicago, London and Paris, interviewing curators, scientists, and exhibit designers, and providing a wealth of fascinating observations. We learn how the first museums were little more than high-toned side shows, with such garish exhibits as the pickled head of Peter the Great's lover. In contrast, today's museums are hot-beds of serious science, funding major research in such fields as anthropology and archaeology. "Rich in detail, lucid explanation, telling anecdotes, and fascinating characters.... Asma has rendered a fascinating and credible account of how natural history museums are conceived and presented. It's the kind of book that will not only engage a wide and diverse readership, but it should, best of all, send them flocking to see how we look at nature and ourselves in those fabulous legacies of the curiosity cabinet."--The Boston Herald.
Download or read book Plant Invasions in Protected Areas written by Llewellyn C. Foxcroft and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first comprehensive global review of all aspects of alien plant invasions in protected areas. It provides insights into advances in invasion ecology emanating from work in protected areas, and the link to locally relevant management support for protected areas. The book provides in-depth case studies, illuminating interesting and insightful knowledge that can be shared across the global protected area network. The book includes the collective understanding of 80 ecologists and managers to extract as much information as possible that will support the long-term management of protected areas, and the biodiversity and associated ecosystem services they maintain. “This outstanding volume draws together pretty much all that can be said on this topic, ranging from the science, through policy, to practical action”. Dr. Simon N. Stuart, IUCN Species Survival Commission, UK. "This important and timely volume addresses two of the most serious problems affecting biodiversity conservation today: assessing the extent to which protected areas are impacted by biological invasions and the complex problems of managing these impacts. Written by leading specialists, it provides a comprehensive overview of the issues and gives detailed examples drawn from protected areas across the world". Professor Vernon H. Heywood, School of Biological Sciences, University of Reading, UK
Download or read book Taxonomy and Genetics of Oenothera written by R. Ruggles Gates and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: At the beginning of this century the mutation theory of evolution, based by HUGO DE VRIES on many years of culture experiments mainly with Oenothera Lamarckiana, took the world by storm when published in 1901. As early as 1889 DE VRIES had shown that various plant "monstrosities" are inherited. His breeding experi ments with other plants involved the rediscovery of MENDEL'S laws and the resuscitation of MENDEL'S breeding methods, which had been in abeyance in the long period from 1865 to 1900. MENDEL began his crossing experiments in 1854, DE VRIES began his Oeno thera cultures in 1886. The genus Oenothera was thus the first after Pisum to be the subject of extensive genetic experiments. Thus was introduced the method now so widely pursued. It may be remembered also that DE VRIES drew the distinction between fluctuations and mutations, but he regarded all fluctuations or continuous variations as non-heritable. Both can be equated with the continuous and discontinuous variations of BATESON. DE VRIES' conception of mutations corresponds with the "single variations" of DARWIN, except that he regarded each mutation as producing a new elementary species, now generally called microspe cies. He said in the introduction to his Mutationstheorie, that the characters of organisms are built up from units which are as sharply distinguished from each other as the molecules of chemistry. These units can be united into groups, and in related species of plants and animals the same units and groups are repeated.
Download or read book European Strategy on Invasive Alien Species written by Piero Genovesi and published by . This book was released on with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cytology in Evolution of Parthenogenesis written by E. Suomalainen and published by Springer. This book was released on 1987-08-31 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Berichte Biochimie und Biologie written by and published by . This book was released on 1980 with total page 1088 pages. Available in PDF, EPUB and Kindle. Book excerpt:
