Document Type : Original Article
Authors
1
Department of Agronomy, Faculty of Agriculture, South Valley University, Qena, Egypt.
2
Qena Directorate of Agriculture, Qena, Egypt
Abstract
Sixty four genotypes (28 F1,s, 28 F2-populations and their 8 parents) were evaluated for days to heading, plant height, 100-grain weight and grain yield/plant under two sowing dates (Nov., 22nd , normal sowing date and Dec., 30th, late sowing date) in 2017/2018 growing season at the Exp. Farm of South Valley Uni., Qena, Egypt. The differences among parents, F1,s, F2-populations andparents vs crosses were highly significant at both planting dates for all studied traits. Delaying sowing date reduced performance all studied traits. The parents; P3, P4, P6 and P8 and the crosses; P1 × P3, P1 × P6, P1 × P8, P2 × P3, P2 × P5, and P3 × P8 displayed HSI and S less than one and they were relatively heat tolerant and less sensitive to heat of F1 and F2-generations. Highly significant differences due to general (GCA) and specific (SCA) combining abilities were detected for all studied traits. The ratio of GCA to SCA was less than one for all studied traits, indicating that the major effect in the control of these traits was by non-additive gene action, except plant height. The parent P3 was considered as the best combiner for heading, plant height and grain weight, but the parent P2 was considered as the best combiner of F1,s and F2-generations for 100-grain weight and grain yield/plant under both dates. The cross P2 × P8 could be considered as the best combination of F1,s and F2-generations for all studied traits under both planting dates.
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