Author(s):

Mamata Khandappagol, MP Rajanna and SK Savita

Abstract: An investigation was carried out to study the frequency distribution and variability produced in two F₂ populations of rice viz., ‘Rajamudi × BR-2655’ and ‘Rathnachoodi × BR-2655’ for grain yield and its seven component characters. The F₂ populations of both the crosses showed high PCV and GCV values for grain yield per plant and low PCV and GCV was observed for thousand grain weight and panicle length. The traits Plant height and grain yield per plant had high heritability along with high genetic advance indicate that these characters attributable to additive gene effects. Skewness and kurtosis indicated dominance based complementary gene interaction involving large number of genes. Duplicate type of epistasis was observed in the inheritance of filled grains per panicle in both the crosses. Moderate number of genes among which equal frequency of genes had increasing and decreasing effect with duplicate type of epistasis was observed in the expression of days to fifty per cent flowering and grain yield per plant in both the crosses.

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