Efficiency of Selection for Seed Cotton Yield under Newly Reclaimed Lands Conditions

M. Salem, H. Mahrous,, H. Hussein, M. M. Abd El Majeed
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Abstract

Selection for seed cotton yield plant -1 was applied in F 2 , F 3 and F 4 -generations of a population of cross Giza 80 X Giza 90 cotton. The experiment was carried out during three successive summer seasons; 2019, 2020 and 2021 at farm west of Minia, El Minia under new reclaimed lands conditions. Entries mean squares of the selection criterion; seed cotton yield were significant or highly significant in F 3 and F 4 -generations. Reduction was observed in the phenotypic and genotypic coefficients of variability from F 3 to F 4 compared to the phenotypic variation in F 2 for the most studied traits as a result the selection for seed cotton yield/plant and reduction the genetic variation. Moreover, increasing the homozygosity. The four selected families of no. 13, 17, 18 and 26 were showed highly significant increase compared to both bulk and better parent for the two traits seed cotton yield and lint yield plant -1 . Seed cotton yield /plant was showed positive genotypic and phenotypic correlation coefficients with bolls weight, lint yield /plant -1 and number of bolls plant -1 . While, negative correlations were observed for Seed cotton yield / plant with each of lint percentage and lint index on genotypic and phenotypic levels.
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新开垦条件下棉籽棉产量选择效率研究
对吉萨80 ×吉萨90杂交群体第2、3、4代进行了籽棉产量植株-1的选择。实验在连续三个夏季进行;2019年、2020年和2021年,在新的开垦土地条件下,在El Minia以西的农场。条目的均方选择标准;籽棉产量在第3、4代显著或极显著。与f2的表型变异相比,f3 ~ f4的表型变异系数和基因变异系数均有所降低,这是由于籽棉产量/株的选择和遗传变异的减少。此外,增加了纯合性。选定的4个家庭的编号为。13、17、18和26在籽棉产量和皮棉产量上均显著高于散装亲本和优质亲本。籽棉单株产量与铃重、皮棉单株产量-1和铃数-1呈显著正相关。籽棉单株产量与衣分率和衣分指数在基因型和表型水平上呈显著负相关。
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