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Heterosis and combining ability in some cotton crosses in two different environments: 1- Yield and yield components traits [electronic resource].

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Sorour, F. A

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Language: English Summary language: Arabic Description: p.1707-1723Other title:

تقدير قوة الهجين والقدرة على التالف فى بعض هجن القطن المصرى المنزرعة تحت بيئات مختلفة : 1-المحصول ومكوناته [Added title page title]

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Mansoura University Journal of plant production, 2013 v. 4 (11) [electronic resource].

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In: Mansoura University Journal of plant production 2013.v.4(11)Summary: Two experiments were carried out at Sakha Agriculture Research Station, Cotton Research Institute, Agriculture Research Center, Egypt. The aim of this investigation was to study heterosis and combining ability for the most important traits of cotton (boll weight, seed cotton yield, lint yield, lint percentage, number of bolls per plant and seed index). Eight cotton genotypes 10229 X G.86, G.45, Pima s1. Suven, TNB, CB.58, G. 70 and G. 93 were crossed in half diallel mating design in 2011 season to obtain 28 single crosses. These parents and their respective 28 F1 crosses were evaluated in two planting dates (April and May) in a randomized complete blocks design in 2012 season. The results obtained could be summarized as follows:- 1-Highly significant mean square values were obtained for genotypes, genotypes x dates, parents x dates, crosses x dates for all the studied traits. 2-The best general combiner for most of studied traits was parent (10229 x G. 86). Also the best general combiners for most of studied traits were crosses (10229 x G. 86) x Pima S,, G.45 x G.70, CB.58 x G.70 and CB.58 X G.93 3-The parent (10229 x G. 86) had the best general combining ability for boll weight, seed cotton yield, lint yield and lint percentage under two sowing dates and their combined. 4-The crosses CB.58 x G.93 and G.45 x G.70 showed highly significant desirable specific combining ability for boll weight, seed cotton yield, lint yield and number of bolls per plant at two sowing dates and their combined.

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Two experiments were carried out at Sakha Agriculture Research Station, Cotton Research Institute, Agriculture Research Center, Egypt. The aim of this investigation was to study heterosis and combining ability for the most important traits of cotton (boll weight, seed cotton yield, lint yield, lint percentage, number of bolls per plant and seed index). Eight cotton genotypes 10229 X G.86, G.45, Pima s1. Suven, TNB, CB.58, G. 70 and G. 93 were crossed in half diallel mating design in 2011 season to obtain 28 single crosses. These parents and their respective 28 F1 crosses were evaluated in two planting dates (April and May) in a randomized complete blocks design in 2012 season. The results obtained could be summarized as follows:- 1-Highly significant mean square values were obtained for genotypes, genotypes x dates, parents x dates, crosses x dates for all the studied traits. 2-The best general combiner for most of studied traits was parent (10229 x G. 86). Also the best general combiners for most of studied traits were crosses (10229 x G. 86) x Pima S,, G.45 x G.70, CB.58 x G.70 and CB.58 X G.93 3-The parent (10229 x G. 86) had the best general combining ability for boll weight, seed cotton yield, lint yield and lint percentage under two sowing dates and their combined. 4-The crosses CB.58 x G.93 and G.45 x G.70 showed highly significant desirable specific combining ability for boll weight, seed cotton yield, lint yield and number of bolls per plant at two sowing dates and their combined.

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