Evolutionary significance of varietal groups resistant to bacterial leaf blight in rice
2003
Ogawa, T. | Endo, N. | Busto, G.A., Jr. | Tabien, R.E. | Taura, S. | Khush, G.S.
Intraspecific variation in rice has been of great importance in breeding. No single character is believed to be a criterion of varietal differentiation, however, a reaction pattern to bacterial leaf blight (BB) races led to the natural formation of varietal groups. The diversity of each varietal group was supported by isozyme classification as well as DNA analysis. The genes for BB resistance and isozyme loci are located on different chromosomes. This dispersed nature of gene location is not simply interpreted as due to genetic linkage. Hence, it could be proposed that varietal differentiation as a result of evolutionary dynamics during domestication is closely linked to varietal groups resistant to BB.
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