GENETIC ANALYSIS OF GRAIN NUMBER, GRAIN WEIGHT AND GRAIN YIELD IN RICE (ORYZA SATIVA L.)

Abstract

In a cross of Begunbuchi and IRAT 102 varieties of rice having extreme variations for numberof grains and 1000-grain weight,additive and additive x additive interaction effects were found important in the inheritance of grains/panicle and 100D-grainweight. However, grain yield was predominantly governed by dominance effects and additive Xdominance and dominance X dominance interaction effects. Complementary type epistasis was observed for grains/panicle and l000-grain weight, while duplicate type epistasis was prominent for grain yield. The midparent heterosis was maximum (29.30/.) for grain yield/plant. Appropriate breeding methodologies for the exploitation of various type of gene effects observed in the present study are discussed.