M. Q. I. MATIN
Plant Breeding Division, BARI
M. AMIRUZZAMAN
Plant Breeding Division, BARI
S. BEGUM
Plant Breeding Division, BARI
Line × Tester, General combining ability, Specific combining ability, Heterosis, Hybrid
Variety and Species
Annual Research Report, Plant Breeding Division, BARI--2014-15
The analysis of variance revealed significant differences among the crosses for yield and other traits indicating sufficient genetic variability present among the hybrids. The analysis of variance also revealed significant differences in the variance due to lines, testers, and Line x Testers for some of the yield and contributing traits. Significant differences were observed between the lines for wt. with husk/ cob, ear length (cm), ear diameter (cm),cob/ plant, days to 1st cob harvest and yield/ plant (g). A significant difference was also exist between testers due wt. with husk/ cob, wt. without husk/cob, days to 50% silking, cob/ plant, total fodder wt./plant (g) and yield/ plant (g). Significant differences were also observed between interactions of Line × Testers for wt. with husk/ cob, wt. without husk/cob, cob/ plant, total fodder wt./plant (g) and yield/ plant (g) indicating that there were wide range of variability among lines and testers for the traits. The interaction of Line × Tester showed significant differences in all the traits except days to 50% tasselling, days to 50% silking, upper cob height (cm), lower cob height (cm), ear length (cm), interval between 1st and last cob harvest. The higher estimation of dominance variance as compared to additive variance for the characters days to 50% tasselling, days to 50% silking, plant height (cm) wt. with husk/ cob, wt. without husk/cob,cob/ plant, total fodder wt./plant (g), days to 1st cob harvest, interval bet 1st and last cob harvest and yield/ plant (g) probably due to predominance of non-additive gene action, which suggesting the scope of improvement of these characters through heterosis breeding. The proportional contribution of lines and interactions to total variances was much higher than testers in all the traits except days to 50% silking, plant height (cm) , upper cob height (cm), lower cob height (cm), total fodder wt./plant (g). However, the contribution of lines was higher than the interactions to total variances for the characters wt. with husk/ cob, cob/ plant and interval bet 1st and last cob harvest. In this study female parent contributed maximum to total variance for yield, which was followed by interaction and testers contributed lowest to total variance for yield.
The inbred parents KH-101/S3-1, KH-101/S3-44 identified for yield such as cob/plant and , wt. with husk/ cob and KH-101/S3-32 for early maturing and have been selected as good general combiner for their ability to transmit traits to their progenies for most of other characters also.The good combination KH-101/S3-44×VS/S3-24 , KH-101/S3-44×VS/S3- 25, KH-101/S3-32×VS/S3-24 could be used in future breeding program to develop high yielding baby corn hybrids with desirable qualities
Report/Proceedings