Abstract

                                Grain and straw yields in rice were under the influence of dominance gene action predominantly and the heritability was moderate. Plant height, number of grains per panicle, hundred grain weight, harvest index (grain-straw ratio), length, width and length-width ratio of grain were found to be governed by additive gene action mainly, having high heritability estimates. Tiller number was controlled by dominance gene action with low heritability while panicle length was influenced by both additive and dominance gene action with high heritability. Under the above situation, a reciprocal recurrent selection or modified back-cross technique may be resorted to evolve high yielding short stature strains with fine quality of rice.

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