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Analysis of diallel crosses among ten maize populations differing in drought tolerance [electronic resource].

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Al-Naggar, A. M

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Language: English Summary language: Arabic Description: p.179-198Other title:

تحليل الهجن الدائرية بين عشرة عشائر من الذرة الشماية تختلف فى تحملها للجفاف [Added title page title]

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Egyptian journal of plant breeding, 2002 v. 6 (1) [electronic resource].

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In: Egyptian Journal of Plant Breeding 2002.v.6Summary: All possible crosses (excluding reciprocals) were made between ten maize open pollinated populations (differing in drought tolerance) in 1999 season. In 2000 season, the parental populations and their 45 F₁ 's were evaluated in two sowing dates under waterstress and non-stress conditions (at flowering stage) at the Exp. Sta. of Fac. of Agric., Cairo Univ., Giza. The objectives were to study performance, comibining ability, type of gene action, heterosis, heritability and expected selection gain for drought tolerance in populations and their F₁ crosses. Estimates of heterobeltiosis were higher in magnitude under water stress than under control. Maximum heterobeltiosis for gmin yield (38.61 %) was reached under stress by the cross Cairo-1 X BS-11. General (GCA) was greater in magnitude than specific (SCA) combining ability variance for all studied traits under both control and water-stress conditions. GCA variance was more affected by sowing dates than SCA variance under both stress treatments. Giza-2 and C-87 populations were the best general combiners for increasing grain yield of hybrids under stress and control treatments.

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All possible crosses (excluding reciprocals) were made between ten maize open pollinated populations (differing in drought tolerance) in 1999 season. In 2000 season, the parental populations and their 45 F₁ 's were evaluated in two sowing dates under waterstress and non-stress conditions (at flowering stage) at the Exp. Sta. of Fac. of Agric., Cairo Univ., Giza. The objectives were to study performance, comibining ability, type of gene action, heterosis, heritability and expected selection gain for drought tolerance in populations and their F₁ crosses. Estimates of heterobeltiosis were higher in magnitude under water stress than under control. Maximum heterobeltiosis for gmin yield (38.61 %) was reached under stress by the cross Cairo-1 X BS-11. General (GCA) was greater in magnitude than specific (SCA) combining ability variance for all studied traits under both control and water-stress conditions. GCA variance was more affected by sowing dates than SCA variance under both stress treatments. Giza-2 and C-87 populations were the best general combiners for increasing grain yield of hybrids under stress and control treatments.

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