Genetic study of allogamic traits in Oryza sativa L.

S. S. Ali, S. J. H. Jafriand M. A. Butt 

Abstract

Four varieties of Oryza sativa L. and their F1 and F2  progenies were studied with respect to allogamic traits. The degree and direction of heterosis varied greatly for different characters and different crosses. Both additive and non-additive gene actions were evident in controlling the characters. Inbreeding depression was significant for anther length and pollen grain size. The dominance relationships were highly variable. Both positive and negative directions of dominance were indicated for all characters. Heritability estimates were relatively high for anther length, 100-anther weight and percentage of filled spikelets. Anther length was positively correlated with 100-anther weight and pollen grain size. Evidence was obtained for the feasibility of selection in early segregating generation for these traits.

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