Diallel Analysis of Grain Size of Rice (Oryza Sativa L.)

Abstract

F₂ half-diallel analysis for grain length and width of rice was carried out using five cultivars with a wide range of grain size, i.e., BG 1, Arborio J1, Kairyo-omachi, Koshihikari and Nakateshinsenbon. Additive gene effect is found out to play a more important part than non-additlve effect for both grain length and width. For grain length, the alleles causing shorter grains are estimated to be partially dominant to, and more frequent than, the alleles causing longer grains. No clear dominance effect is detected for grain width. The length and width of grain are inferred to be controlled by different genetic systems.