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Utilization of triple test cross in bread wheat f2 populations [electronic resource]: 1- predicting of new recombinant lines and genetic correlations

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Dawwam, H. A

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Language: English Summary language: Arabic Description: P.431 - 443Other title:

أستخدام التلقيح الاختباري الثلاثي في عشائر الجيل الثاني لقمح الخبز1.التنبؤ بالتراكيب الوراثية الجدية وتقدير الارتباط الوراثى [Added title page title]

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Minufiya journal of agricultural research, 2015 V. 40 (2) [electronic resource].

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In: Minufiya Journal of Agricultural Research 2015.v.40(2)Summary: Epistasis, additive and dominance components of genetic variation for yield and some yield related traits were assessed through triple test cross technique in bread wheat. Two genotypes of bread wheat, Gemmeiza 11 and Line 1, and their F1 progeny were used as a testers to crossed with twenty random selected F2 plants from the previous cross (Gemmeiza11 x Line 1 ) to produce L1i (P1 x F2i), L2i (P2 x F2i) and L3i (F1i x F2i) respectively. The sixty families (L1 (20) + L2 (20) + L3 (20)) were sown at Experimental Farm of Gemmeiza Agriculture Research Station to study gene action, predicting of new recombinant lines and genetic correlation for some quantitative traits. The mean squares of the analysis of variance revealed significant differences among triple test cross (T. T. C) families for all the traits studied indicating that L1i, L2i and L3i families were significantly different from each other, providing evidence for adequate amount of genetic variability. Epistasis was found an important part of genetic variation for all traits studied. Partitioning of total epistasis into (i) type and (j +L) types of epistasis revealed that (i) type of epistasis (additive x additive) was found to be significant and highly significant for most traits studied except plant height, main spike length, number of spikelets per main spike and kernels per spike. However, (J+ L) additive x dominance, dominance x dominance, types were also highly significant for most traits studied except number of days to heading.

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Epistasis, additive and dominance components of genetic variation for yield and some yield related traits were assessed through triple test cross technique in bread wheat. Two genotypes of bread wheat, Gemmeiza 11 and Line 1, and their F1 progeny were used as a testers to crossed with twenty random selected F2 plants from the previous cross (Gemmeiza11 x Line 1 ) to produce L1i (P1 x F2i), L2i (P2 x F2i) and L3i (F1i x F2i) respectively. The sixty families (L1 (20) + L2 (20) + L3 (20)) were sown at Experimental Farm of Gemmeiza Agriculture Research Station to study gene action, predicting of new recombinant lines and genetic correlation for some quantitative traits. The mean squares of the analysis of variance revealed significant differences among triple test cross (T. T. C) families for all the traits studied indicating that L1i, L2i and L3i families were significantly different from each other, providing evidence for adequate amount of genetic variability. Epistasis was found an important part of genetic variation for all traits studied. Partitioning of total epistasis into (i) type and (j +L) types of epistasis revealed that (i) type of epistasis (additive x additive) was found to be significant and highly significant for most traits studied except plant height, main spike length, number of spikelets per main spike and kernels per spike. However, (J+ L) additive x dominance, dominance x dominance, types were also highly significant for most traits studied except number of days to heading.

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