Inhaltsangabe
The wild taxa of crop plants have been extensively used for the development of biotic and abiotic stress resistant varieties and transfer of numerous other attributes desired for crop improvement. The purpose of the book is to present an overview of basic and applied aspects of hybridization of distantly related species and genera of crop plants. The book, comprising of 12 chapters has been written by the experts from the various countries. Some of the topics covered are: distant hybridization; crossability relation and barriers to crossability; overcoming the barriers in distant hybridization; unilateral incompatibility in distant hybridization; sterility in the hybrids of distant species/genera and cytogenetics of F1 and their progenies obtained from distant hybridization. The volume aims to be a valuable source of reference on distant hybridization intended to serve researchers and scientists working on plant breeding, genetics, biology and agriculture.
Reseña del editor
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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