Genotypic differences for heat tolerance traits in bread wheat using five parameters genetic model [electronic resource].

Includes references.

The present work was carried out during 2008/2009 to 2011/2012 to study five populations (P1, P2, F1, F2, and bulk of F3) for the three crosses i.e., Giza 168 x Pastor, Kanchan x Pastor and Debira x Kanchan under optimum and late sowing date in two experiments. The first experiment was planted in optimum sowing date (15 November) and the second was planted in late sowing (IS December) in Sbandaweel Station, Sohag Governorate, Agriculture Research Center. The three crosses were significantly differed for almost the studied traits. Under optimum sowing date, highly significant and positive heterotic effects, compared to better parent, were found for maturity date in the second cross, number of kernels/ spike in the first cross, and 100-kernel weight and grain yield/ plant in the third cross. Under late sowing date, significant and positive heterotic effects were found for maturity and grain yield! plant in the first and second crosses, and number of spikes/ plant in the second cross.

Summary in Arabic.

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