Agronomic performance and genetic correlations of rice mutants [India]
1988
Kaul, M.L.H. | Neelangini (Kurukshetra Univ., Kurushetra (India). Botany Dept.)
By using different mutagen doses, five mutants were isolated in rice varieties, IR8, Jhona, and Basmati. Both mutants of IR8 (IRm1 and IRm6) are early and fine-grained, with higher seed protein content. Both mutants of Jhona (Jm1 and Jm4) are shorter and yield higher than their parent. Jm4 has higher grain number and grain yield than Jm1. Basmati mutants Bm1 has shorter duration and is shorter and has finer grains, with higher grain number, protein content, and seed yield, than Basmati. Although the genetic parameters phenotypic and genotypic coefficient of variation, heritability, genetic advance and expected genetic advance were not different in the mutants, significant differences in certain genetic correlations were exhibited. Grain yield became negatively correlated with grain fineness and positively correlated with grain weight; these correlations are not significant in the parent varieties. Grain fineness in the parent varieties is not correlated with grain weight and grain number; in the mutants, these correlations are negative and significant. Shoot height in the mutants is negatively correlated with grain weight; in the parents, this correlation is not significant. Whether these represent mutational changes or chance changes needs to be determined, using a large sample of mutant types.
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