GENETIC EVALUATION OF COTTON RECOMBINATIONS PRODUCED BY BIPARENTAL MATING SYSTEM | ||
| Egyptian Journal of Agricultural Research | ||
| Article 20, Volume 84, Issue 4, December 2006, Pages 1227-1239 PDF (3.18 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.2006.233582 | ||
| Author | ||
| HISHAM M. KH. HEMAIDA | ||
| Cotton Research Institute, Agricultural Research Center, Giza, Egypt. | ||
| Abstract | ||
| Thirty-six cotton progenies were produced by using biparental mating of 58.58 x G.91 F2 with their parents to study the extent of this system in breaking unfavorable linkage groups and obtaining new promising recombinations. North Carolina Design III was used to estimate mean performances of the progenies, the phenotypic variances and their components, heritabilities and genetic correlations for yield, its components, earliness and some fiber traits. Generally the progenies derived from G.91 exhibited higher yield and yield components, on the other hand, the progenies of the second parent SB.58 showed better performance for fiber baits. While, there were only two progenies of G.91 behaved earlier performance for days to first flower trait comparing to other progenies of both parents. The proportional contribution values of males were higher for all studied traits with exception for miaonaire value and uniformity ratio characters. The results also, revealed that the additive variances playing a major role of the inheritance of all studied characters except uniformity ,ratio, indicating that the direct selection could improve these traits. Positive additive genetic correlations were detected for seed cotton yield with boll number and for boll weight with seed index, suggesting the effectiveness of indirect selection for improvement of yield and boll weight by selection for their related characters. The positive and negative dominance correlations which were detected for some traits are of interest in explaining the relatively high degree of heterotic association among traits. | ||
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