The genetics of blackarm resistance
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Two forms of resistance occur inGossypium barbadense: weak resistance, due to leaf hardening, is found in the Sea Islands, and strong resistance, due to the geneB 5 fortified by minor genes, occurs in the perennial variety Grenadines White Pollen.B 5 is variable in expression but, in general, the homozygotes show stronger resistance than the heterozygotes.B 5 is additive in conjunction withB 1, B2, B3 andB 4 respectively.
KeywordsResistance Gene Minor Gene Backcross Progeny Major Resistance Gene Leaf Hardening
- Knight, R. L. (1942). Resistance to blackarm disease (Bact. malvacearum Sm.) in cotton with special reference to its genetics and to the breeding of strains resistant to the disease. University of London, Ph.D. Thesis.Google Scholar
- Knight, R. L. (1949). The genetic control of blackarm disease (Xanthomonas malvacearum) in cotton.Proc. Int. Congr. Comp. Path., Istanbul. Google Scholar
- Knight, R. L. & Hutchinson, J. B. (1950). The evolution of blackarm resistance in cotton.J. Genet. (in the Press).Google Scholar