Path coefficient analysis of seven characters in cold-tolerant rice (Oryza sativa L.)[Bangladesh]
1991
Haque, M.E. | Baset, A. | Zeenat, Z. | Miah, N.M.
Phenotypic and genotypic correlations and path coefficients were studied in seven characters including yield per plant for two indica and one japonica rice groups. In most of the cases, genotypic associations were higher than the phenotypic associations. Yield per plant was found highly and positively associated with plant height, growth duration and fertile grain per panicle. Modern varieties/lines had negative association between yield and panicle per plant. The traditional group showed no association except yield and 1000-grain weight showed negative relation. In path coefficient analysis, direct effects on yield were high for plant height, growth duration and fertile grain per panicle. The direct effects as well as correlation coefficients between 1000-grain weight and yield were negative for traditional varieties. Improvement of yield could be effective by direct selection for plant height, growth duration and fertile grain per panicle for modern and japonica groups and decreasing 1000-grain weight for traditional varieties. Direct effects did not fit always with the association because of the influence of indirect causal factors like panicle per plant. In such situations, causal factors should also be considered during selection.
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