Ebook: Distant Hybridization of Crop Plants

Wild taxa are invaluable sources of resistance to diseases, insects/ pests, nematodes, temperature extremes, salinity and alkalinity stresses, and also of nutritional quality; adaptation; genetic diversity and new species. Utilization of wild relatives of a crop depends largely upon its crossability relations with cultivated varieties. Sev­ eral wild species are not crossable with the commercial cultivars due to various isolation barriers. Furthermore, in a few cases, hybridiza­ tion is possible only in one direction and reciprocal crosses are not successful, thus depriving the utilization of desired cytoplasm of many species. However, techniques have been developed to over­ come many barriers and hybrid plants are produced. New crop species have been developed by overcoming the F 1 sterility and producing amphidiploids and such crops are commercially being grown in the field. The segregation pattern ofF 1 hybrids produced by distant hybridization in segregating generations are different from the intervarietal hybrids. In former cases, generally, unidirectional segregation takes place in early generations and accordingly, selec­ tion procedures are adopted. In most of the cases, backcross or modified backcross methods have been followed to utilize wild species, and thus numerous types of resistance and other economical attributes have been transferred in the recurrent parents. Protoplast fusion has been amply demonstrated in a number of cases where sexual hybridization was not possible and, as a result, hybrids have been produced.

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The book presents a comprehensive review of modern and classical aspects of distant hybridization. Emphasis is given on crossability relationships, presyngamic and postsyngamic barriers, methods to overcome the barriers, useof distant species to develop disease, insect, pest and stress resistant varieties, methods of transferring resistance genes from wild species to cultivated varieties, selection procedure in the progenies of distant hybrids, and synthesis of new crop species. In addition, various aspects of biotechnology, somatic cell hybridization, molecular biology and genetic engineering for the utilization of wild species are discussed. It is an excellent source of reference for researchers and advanced students working on plant breeding, genetics, and agriculture.

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The book presents a comprehensive review of modern and classical aspects of distant hybridization. Emphasis is given on crossability relationships, presyngamic and postsyngamic barriers, methods to overcome the barriers, useof distant species to develop disease, insect, pest and stress resistant varieties, methods of transferring resistance genes from wild species to cultivated varieties, selection procedure in the progenies of distant hybrids, and synthesis of new crop species. In addition, various aspects of biotechnology, somatic cell hybridization, molecular biology and genetic engineering for the utilization of wild species are discussed. It is an excellent source of reference for researchers and advanced students working on plant breeding, genetics, and agriculture.
Content:
Front Matter....Pages I-XI
Introductory Considerations on Distant Hybridization....Pages 1-14
Crossability Relations....Pages 15-31
Unilateral Incompatibility....Pages 32-46
Overcoming the Barriers in Hybridization....Pages 47-61
Amphidiploids/Synthetic Crop Species....Pages 62-81
Cytogenetics of F1 and Their Progenies....Pages 82-105
Apomixis in Distant Hybridization....Pages 106-121
Selection Theory and Procedure in Progenies of Distant Hybrids....Pages 122-148
Utilization of Wild Species....Pages 149-167
Somatic Cell Hybridization....Pages 168-198
Molecular Biology/Genetic Transformation in Distant Hybridization....Pages 199-209
Back Matter....Pages 211-271

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The book presents a comprehensive review of modern and classical aspects of distant hybridization. Emphasis is given on crossability relationships, presyngamic and postsyngamic barriers, methods to overcome the barriers, useof distant species to develop disease, insect, pest and stress resistant varieties, methods of transferring resistance genes from wild species to cultivated varieties, selection procedure in the progenies of distant hybrids, and synthesis of new crop species. In addition, various aspects of biotechnology, somatic cell hybridization, molecular biology and genetic engineering for the utilization of wild species are discussed. It is an excellent source of reference for researchers and advanced students working on plant breeding, genetics, and agriculture.
Content:
Front Matter....Pages I-XI
Introductory Considerations on Distant Hybridization....Pages 1-14
Crossability Relations....Pages 15-31
Unilateral Incompatibility....Pages 32-46
Overcoming the Barriers in Hybridization....Pages 47-61
Amphidiploids/Synthetic Crop Species....Pages 62-81
Cytogenetics of F1 and Their Progenies....Pages 82-105
Apomixis in Distant Hybridization....Pages 106-121
Selection Theory and Procedure in Progenies of Distant Hybrids....Pages 122-148
Utilization of Wild Species....Pages 149-167
Somatic Cell Hybridization....Pages 168-198
Molecular Biology/Genetic Transformation in Distant Hybridization....Pages 199-209
Back Matter....Pages 211-271
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