EXTENT OF GENETIC VARIABILITY CREATED THROUGH BIPARENTAL MATING IN COTTON (Gossypium barbadense L.) | ||||
| Journal of Plant Production | ||||
| Article 1, Volume 4, Issue 9, September 2013, Page 1281-1296 PDF (1.1 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2013.74121 | ||||
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| Authors | ||||
| M. A. Abdel-Moneam1; M. H. Ghoneima1; Y. M. EL- Mansy2; M. W. EL-Shazly2 | ||||
| 1Dept. of Agronomy, Fac. Agric., Mansoura Univ., Egypt. | ||||
| 2Cotton Res. Institute, Agric. Res. Center, Egypt. | ||||
| Abstract | ||||
| A study was undertaken in cotton (Gossypium barbadense, L.) to assess the relative efficiency of biparental mating and F3 selfed populations in realizing greater variability with desirable recombinants using F2 of two crosses viz. (Giza 89 x PS6) x 6022 and Giza 92 x Pima S6 . These F2 populations were advanced to F3 following intermating of biparental mating(BIP) and selfing. The two populations thus developed in each of two crosses were then evaluated for earliness, yield and fiber quality characters. Analysis of variance revealed highly significant differences among biparental sets of families for all studied characters. The variation between plants in biparental progenies were relatively high as compared with F3 selfed families. Biparental progenies proved its superiority over selfing by registering high mean values in desirable direction for most characters. In general, the lower limits of range were lower for earliness characters in biparental progenies, at the same time it were high for yield and fiber characters. Considerable variation was observed in biparental progenies as compared to F3 selfed populations for most of the characters, which confirmed by high mean genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) values. The variation created on account of biparental mating was found to be heritable as seen from increases of discrepancy between (PCV) and (GCV) and reflected less influence of environmental factors. The contribution of additive variance was higher than the non additive variance for most earliness characters, lint percentage, lint index and uniformity ratio in both BIP and F3 selfed populations. The magnitude of non-additive were largely estimated in BIP for most yield characters, fiber fineness and strength in both crosses as compared with F3 selfed. Broad sense heritability improved considerably for most characters in BIP because of the increase of genetic variance to the total phenotypic variance due to cryptic genetic changes that have been brought about one cycle of intermating. | ||||
| Keywords | ||||
| Cotton; Biparental mating; PCV; GCV; Genetic variance | ||||
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