Estimate of combining ability and correlation for some bread wheat genotypes

Abstract EN

Seven bread wheat (Sids1, Sids12, Sids13, Misr 1, Giza 171, Gammeiza11 and Sakha93) were used as parents of a 7 x 7 half-diallel cross.

The obtained 21 F1 crosses and their seven parents were evaluated at Experimental Farm, Faculty of Agriculture, Al-Azhar University, Assiut Branch.

Results manifested that highly significant differences were detected among genotypes, parents, crosses, parents vs.

crosses, general and specific combining abilities for all studied traits.

σ2GCA/σ2SCA was less than the unity for all studied traits.

The F1 mean performance values were increased significantly over the parental mean values for all the studied traits, except number of days to 50% blooming, where they were not differ significantly.

All crosses possessed desirable significant positive heterotic effects over both mid parent and better parent for grain yield/plant, except the crosses, P3 x P7 and P6 x P 7.

The cross P5 x P6 had significant positive desirable SCA effects for high yielding ability and number of days to 50% blooming.

Significant positive correlation was detected between grain yield/plant and both of plant height, number of spikes/plant, length of spike and number of grains/plant, while it gave negative correlation with number of days to 50% blooming and 1000-kernel weight.