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Distant Hybridization of Crop Plants (Paperback, Softcover reprint of the original 1st ed. 1992)
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Distant Hybridization of Crop Plants (Paperback, Softcover reprint of the original 1st ed. 1992)
Series: Monographs on Theoretical and Applied Genetics, 16
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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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