RESPONSE TO SELECTION FOR LINT YIELD IN F2 AND F3 POPULATIONS OF EGYPTIAN COTTON HYBRID | ||
| Egyptian Journal of Plant Breeding | ||
| Volume 27, Issue 2, June 2023, Pages 247-268 PDF (632.61 K) | ||
| Document Type: Original research | ||
| DOI: 10.12816/ejpb.2023.314390 | ||
| Abstract | ||
| The present study was carried out at Shandaweel Agric. Res. Sta., Sohag, Egypt, during the three summer seasons from 2020 to 2022. Two cycles of pedigree selection (in F2 generation) and one cycle of pedigree selection (in F3 generation) for lint yield/plant were achieved in segregating population of Egyptian cotton (G. barbadense L.) hybrid GCV% and PCV% estimates were high for lint yield/plant and accounted for 39.88, 39.91% and 30.85, 30.88% after two cycles (F2 selection) and one cycle (F3 selection) of pedigree selection. Broad-sense heritability estimates were very high for all studied traits in F2 and F3 selection. The means of selected families after two cycles of F2 selection for lint yield/plant ranged from 41.90g for family no.176 to 81.90g for family no.162 with an average of 58.13g, while the means of the selected families after one cycle of F3 selection for the same trait ranged from 57.70 g for a family no.195 to 81.90g for a family no. 162 with an average of 67.51 g. The average response to F2 selection for lint yield/plant from the better parent was significant (p<0.01) and accounted for 13.15%. Six selected families showed significant direct response ranging from 10.25% for family No.190 to 59.43% for family No. 162. While, the mean response to F3 selection for lint yield/plant from the better parent was significant (p<0.01) and accounted for 31.42% compared with 13.15% in F2 selection. All the ten selected families showed significant direct response ranging from 12.32% for family No.195 to 59.43% for family No. 162. After two cycles of pedigree selection (F2 selection), the coefficients of phenotypic correlation were significant and positive between lint yield and each of seed cotton yield/plant (0.99), boll weight (0.51), number of bolls/plant (0.96), lint index (0.61) and medium with lint percentage (0.39) and seed index (0.49) and low with micronaire reading (0.07) and fiber length (0.03). Also, after one cycle of F3 selection we found high positive values of correlation coefficients between lint yield/plant and each of seed cotton yield (0.96), boll weight (0.60) and number of bolls/plant (0.78). This result revealed that all of seed cotton yield, boll weight, number of bolls, seed and lint index were the main contributors to lint yield/plant and the selection for any of these traits could increase lint yield/plant. | ||
| Keywords | ||
| Cotton; G. barbadense; pedigree selection; lint yield | ||
|
Statistics Article View: 43 PDF Download: 63 |
||
