TRIALLEL CROSSES ANALYSIS FOR SOME QUANTITATIVE CHARACTERS IN Gossypium barbadense L. | ||||
| Journal of Plant Production | ||||
| Article 10, Volume 31, Issue 6, June 2006, Page 3451-3461 PDF (3.23 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2006.236032 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| G. M. Hemaida,; H. H. EI-Adly; S. A.S. Mohamed | ||||
| Cotton Research Institute, Agricultural Research Center, Giza, Egypt | ||||
| Abstract | ||||
| This study was carried out through three successive growing seasons (2003, 2004 and 2005). Thirty triallel crosses were combined among five parental lines belong to Gossyp < /em>ium barbadense L. were evaluated at Sids Agricultural Research Station to estimate general and specific combining abilities for yield, yield components and some fiber properties. The nature of gene action that controlling the inheritance of the studied characters were also estimated. . The results showed that the performances of most triallel crosses were as good as or better than their both grand parents orland their third parent. The mean squares of genotypes were highly significant for all studied characters which were mainly due to the variances among the parents as well as the variances among the triallel crosses. The mean squares of general and specific combining abilities were significant for first and second kind for most traits. Significant positive general effects of hi and gi revealed that the selection of P3 or P5 as a grand parent and P1 or P2 as a third parent would be more benefit to improve SCY and L Y characters in the breeding programs. The triallel crosses (15 x 2), (34 x 2), (35 x 2) and (45 x 2) were positive and significant for yield and its components, (25 x ~) for MIC, PI, UHM and UI, (12 x 4) <lnd (23 x ~) for PI, UHM and UI. The results also showed that the specific effects of the triallel crosses (tijk) were predominately cffe::ted by the specific effects of second kind effects (sij) (third parent) rather than the first kind (dij) (single hybrids) and partially by the general effects of first and second kind. The magnitudes of dominance variances were larger than those of the additive variances for all studied traits except for MIC and UHM traits. Concerning the epistatic variances, the results indicated that the additive x dominance type of epistasis played the major role in controlling the inheritance of the stucied characters of the triallel crosses. Therefore, recurrent selection might be useful in improving the studied characters of the triallel crosses in the breeding programs. | ||||
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