Triple test cross analysis of some physiomorphological traits in Basmati rice (Oryza sativa L.).

The genetic basis of flag leaf area, days to flowering, seed weight per panicle, biological yield per plant, harvest index and yield per plant were investigated using triple test cross analysis in Basmati rice. Epistasis was detected for all the traits except biological yield per plant. Partition of epistasis into i (additive x additive) and j + l (additive x dominance + dominance x dominance) types showed that epistasis of i and j + l types were involved in the expression of those traits. Expression of epistasis was dependent on particular cultivars. Various lines contributed significant and positive epistatic deviations to the total epistasis. Additive (D) and dominance (H) genetic components controlled the manifestation of biological yield per plant. However, partial dominance was revealed by degree of dominance (H/D) 1/2 for this trait. Direction of dominance (rs.d) was nonsignificant for biological yield per plant showing absence of directional dominance. Due to influence of epistatic effects for majority of the traits, recurrent selection may be recommended to develop high yielding Basmati rice varieties.

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