Components of resistance to bacterial blight disease of rice
1987
Nayak, P. (Central Rice Research Institute, Cuttack (India)) | Suriya Rao, A.V. | Chakrabarti, N.K.
Studies on the genetic variation, correlation, correlated response and path analysis were conducted on 8 rice cultivars to bring out association and channelling of the pathway of different components of resistance to Xanthomonas campestris pv. oryzae. High genotypic coefficient of variation coupled with high heritability and genetic gain was observed for lesion size (LS) and the area under disease progress curve (AUDPC) indicating the predominance of additive gene effects. There was a strong association among all the components both at genotypic and phenotypic levels. Genotypic correlations were higher than the corresponding phenotypic correlations indicating the modifying effect of environment on association of components at genotypic level. Maximum correlated response and relative selection efficiency on AUDPC was observed through indirect selection for LS followed by the number of bacteria per unit leaf area (NB). Path analysis revealed highest direct effect of LS on AUDPC both at genotypic and phenotypic levels. Indire0429ct effects of fairly high magnitude were also exerted by incubation period (IPC) and NB towards A
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