THE EFFICIENCY OF SELECTION FOR LINT INDEX AND THE OTHER TRAITS IN SOME COTTON VARIETIES | ||||
| Journal of Plant Production | ||||
| Article 13, Volume 27, Issue 10, October 2002, Page 6777-6784 PDF (2.3 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2002.256532 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| A. M. Zeina,; M. A. Abd EI-Gelil | ||||
| Ag'ricultural Research Center, Cotton Research Institute | ||||
| Abstract | ||||
| The present investigation was carried out at Sakha Agriculture Research Station, during the three successive seasons of 1999, 2000 and 2001. Six varieties of cotton were used in this study. These varieties were: Giza 70, Giza 88, Giza 76, Giza 86 (An Egyptian varieties), Karshenseky-2 "Kar. 2" (Russian variety) and Pima S6 (An American Egyptian variety). Selection for increasing lint index and its indirect effect were studied on backcrosses and F2 generations of some cotton varieties (Giza 70, Giza 88, Giza 76, Giza 86, Karshenseky-2 and Pima S6). A selection intensity of 5% was used with direct selection. The mean squares from the analysis of variance were significant for genotypes and parents for most studied traits. Crosses and parents virsus crosses mean squares were significant for seed cotton yield/plant, lint yield/plant and fiber length and insignificant for all studied traits, respectively. Positive direction in F2 was accompanied by significant increases of lint percentage in G 70 x Karshenseky-2, G. 88 x Pima S6 and G. 76 x Karshenseky-2, while it was insignificant for boll weight and seed index in most F2 crosses. Backcrosses showed insignificant increases for most traits. The negative direction in backcrosses revealed insignificant decreases for all studied traits in most crosses, while, F2 populations illustrated significant decreases for lint percentage in most crosses and it was insignificant for boll weight, seed index and some fiber traits. Most backcrosses and F2 populations had considerable amounts of the actual genetic gain for lint index, lint percentage, seed index, boll weight, in G 70 x Karshenseky-2, G. 88 x Pima S6 and G. 76 x Karshenseky-2, for seed cotton yield and lint/plant and in G. 70 x Karshenseky-2 for most fiber traits in backcrosses only. No differences between the predicted and the actual genetic gains more observed for lint index on one side and pressley index, 50% span length and 2.5% span length on the other side as indirect effect of selection, indicating an independent inheritance of lint index. | ||||
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