APLICATION OF SOME SELECTION INDICES IN EARLY SEGREGATING GENERATIONS OF BARBADENSE COTTON. | ||||
| Journal of Plant Production | ||||
| Article 16, Volume 5, Issue 7, July 2014, Page 1317-1329 PDF (568.21 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2014.64557 | ||||
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| Authors | ||||
| A. B. A. El-Fesheikawy; M. E. Abd El-Salam; B. M. Ramdan | ||||
| Cotton Research Institute, Agricultural Research center, Giza, Egypt | ||||
| Abstract | ||||
| Some selection procedures i.e. selection index involving 11 indices and direct selection for four separately traits (lint yield/plant, bolls/plant, seeds/boll and lint/seed) were used to improve lint yield, yield components and fiber properties in early segregating generations; F2, F3 and F4 of the cotton cross;(Giza 85 x Dandara). Means of F4 generation were higher than those ofF2and F3 generations for all studied characters except for fiber fineness (desirable)and fiber length .The heritability estimates obtained in F2,F3 and F4 generations were ranged from moderate to high (56.18 to 92.2%) for most traits. These estimates indicate a possible success in the selection of the early generations that were evaluated . Estimates of PCV and GCV in F4 for most traits were higher than those of F2 and F3 generations. It was due to the application of several procedures that having various performance in selection. Phenotypic variances (Vp) were found to be greater than the corresponding genotypic variances (Vg) for all studied characters indicating that the expressions of these characters were influenced by the environmental factors. Deviations of the realized advance from the predicted of lint yield determined in F3 to F4 generations were positive and high for most selection procedures. Data showed that indices; I.w1, I.w2 , I.w123 ,I.w12 , I.w23 , I.w13, I.w3 and I.xw gives high value of improvement in lint yield as predicted and actual advance . However, The data also indicated that predicted advance from F3 had high value of gains relative to actual advance for most indices . Also, the gains were higher in F3 and F4 than those F2 generation. This may be attributed to the efficiency of selection procedures application in this study. After two cycles of selection, the genetic gains from selection isolated it isolation best ten families on base of the highest value in selected and unselected traits; it my be very important in cotton improvement programs . | ||||
| Keywords | ||||
| Predicted gain; Realized gain; Selection procedures; Barbadense cotton | ||||
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