Combining Ability Analysis of 300 Grain Weight in Maize Using Diallel and Triallel Analysis

摘要

All possible diallel and triallel hybrids among seven pure lines of maize (IK8, ZP301, IK58, ZP707, OH40, DK17 and UN44) were included in this study. Genotypes (7 parents, 21 single cross and 60 three-way hybrids) planted in spring, and data were taken on 300 grain weight. The results showed that mean square of genotypes from diallel and hybrids from triallel were highly significant for this character. It was shown from diallel cross analysis that mean square of general and specific combining abilities was highly significant indicating the importance of additive and non additive gene action in the inheritance of this character, while from triallel analysis there were evidence in the presence of additive, non additive and epistatic gene action for this character. The pure lines ZP707, DK17andUN44and the two hybrids (ZP301 x DK17) and (ZP707 x UN44) from diallel cross and the pure lines ZP301and IK58and the hybrid (IK8xZP301)xIK58 from three-way crosses were better in their general and specific abilities effects respectively for 300 grain weight. The effects of specific combining ability appeared more important than general combining ability effect in the two kinds of crosses indicating the importance of dominant and dominant x dominant gene action in the inheritance of the character.