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Inheritance of Floral Characteristics Influencing Outcrossing in Rice

The genetics of three floral characters influencing outcrossing in rice (Oryza sativa L.) was studied in a cross between Accession 100183 of wild rice (Oryza sativa f. spontanea) and the cultivar ‘IR8.’ A high percentage of exserted stigma, short anther, and short stigma were partially dominant. Both additive and nonadditive effects were important in the inheritance of these floral traits. The prevalance of a duplicate type of epistasis in their inheritance indicated that these traits may be improved through recurrent selection in biparental progenies which would allow recombination and concentration of genes with additive effects. The percentage of exserted stigma was positively correlated with stigma length. Both traits were correlated positively with anther length.

Key Words: Anther length • Stigma length • Stigma exsertion • Epistatic effects

Received for publication May 29, 1973.