RELATIVE EFFICACY OF SELECTION INDICES FOR IMPROVING LINT YIELD IN TWO INTRASPECIFIC COTTON CROSSES | ||||
| Egyptian Journal of Agricultural Research | ||||
| Article 16, Volume 86, Issue 1, March 2008, Page 207-222 PDF (3.26 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejar.2008.203928 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| YASER A. SOLIMAN; MOHAMED M. EL-LAWENDEY | ||||
| Cotton Research Institute, Agricultural Research Center, Giza, Egypt | ||||
| Abstract | ||||
| Type of gene action, genotypic and additive correlation coefficients and relative efficacy of twenty nine selection indices for improving lint yield were assessed in the six populations of two intraspecific cotton crosses, (Pima 56 x Giza 87 and Giza 83 x Giza 86). Scaling tests and epistatic deviations demonstrated the presence of non-allelic gene interactions for all studied characters. All types of gene effects were significant and govern the inheritance of most studied characters. In the first cross, positive and highly significant genotypic and additive correlation coefficients were detected for lint yield/plant with bolls/plant, boll weight and lint percentage and the same trend was detected for 2.5% span length with boll weight and Pressley index. The positive direction and the high magnitude of these associations should benefit a breeding program designed to combine the desirable expressions of the lint yield with its components and some fiber traits. In the second cross, genotypic and additive correlations were negative and significant for bolls/plant with boll weight, lint percentage and seed index, and boll weight with lint percentage. The highest predicted genetic and additive advances of lint yield were achieved when selection index includes lint yield/plant and/or boils/plant (Iw1), boll weight (1w2), lint percentage (Iw3) and 2.5% span length (1w2) in the first cross. Regarding the second cross, the selection indices involving lint yield/plant (Iwl, Iw2 and Iw5) or bolls/plant (112, Ii,, 114, In, rib and Iv) were more efficient than the other selection indices and Iw in both methods. Deviations of predicted additive advance (method II) from predicted genetic advance (method I) for lint yield (g)/plant using 29 selection indices in the two crosses were positive and high for all indices with some exceptions, indicating the presence of non-additive gene effects in the inheritance of characters included in these indices. | ||||
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