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Genetic variability study for fiber quality traits in some F1 hybrids of Cotton (Gossypium hirsuitum L.)


The International Journal of Biological Research (TIJOBR)

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Tahira Bano1*, Qurat Ul Ain Nazeer2, Hira Aslam3
1Department of Plant Breeding and Genetics, University of Agriculture Faisalabad, Pakistan.
2Department of Biotechnology, University of Sargodha, Pakistan.
3Department of Physiology, GC University Faisalabad, Pakistan.
*Corresponding email: tahirabano561@gmail.com
Submitted Accepted Published
Oct 01,2020 Nov 18,2020 Nov 26,2020

2020 / Vol: 3 / Issue: 4


Abstract


The present experiment was planned to study the genetic basis of some agronomic traits contributing to yield of upland cotton. In this experiment, four genotypes viz PB-896, PB-76, AGC-2 and VH-282 were used as parents, which were crossed in all possible combinations. The F1 along with four parents was evaluated in field conditions. These progenies were planted in three replications following RCBD. At the time of maturity, data were recorded on plant height, no. of bolls plant-1, boll weight, seed cotton yield and ginning out turn. The data were used for analysis of variance to test the variation among genotypes for these traits. All the genotypes were highly significant for the parameters under studied. The same data set were analyzed for combining ability effects. The results were also highly significant for general combining ability, specific combining ability and reciprocal combining ability. Further combining ability effects and means showed that among the parents AGC-2 was found to be good general combiner for plant height and number of bolls per plant. The parent VH-282 was proved to be a good general combiner for boll weight and ginning out turn while PB-76 was good general combiner for seed cotton yield per plant. The hybrid of PB-896 × PB-76 exhibited good specific combining ability for plant height, number of bolls per plant, boll weight and seed cotton yield per plant. The cross of VH-282 × AGC-2 was found to be good specific combination for number of bolls per plant and PB-76 × AGC-2 was identified as good specific combination for boll weight and seed cotton yield per plant. The hybrid PB-76 × VH-282 was good cross combination for ginning out turn. In case of reciprocal combinations AGC-2 × PB-896 was found to be good combination for plant height, boll weight and seed cotton yield per plant while AGC-2 × PB-76 for number of bolls per plant. The parents and crosses which have good combining abilities for certain traits could be used in breeding programs for the improvement of these traits in cotton.
Key words: Cotton, combining ability effects, agronomic traits


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