Half diallel crosses among 6 genotypes of cotton (Gossypium barbadense L.) as well as their paren... more Half diallel crosses among 6 genotypes of cotton (Gossypium barbadense L.) as well as their parents were evaluated in a randomized complete block design aiming at investigating general combining ability (GCA) effects of parent, specific combining ability (SCA) effects of crosses and the heterotic pattern of the cross combinations. Results showed significant differences among all the crosses means and their respective parental values for all examined traits. The mean squares due to general combining ability (GCA) and specific combining ability (SCA) were also significant. Variances due to SCA were greater than these due to GCA for all studied traits, indicating the predominance of non-additive gene action. The parental genotypes P1, P3 and P5 were the best general combiners and their utilization produced valuable crosses with desirable SCA effects especially for yield components. The cross combinations (P1 x P2), (P1 x P3) and (P5 x P6) performed well in SCA determination and showed outstanding mean performance and heterosis for yield components traits. Better SCA effects associated with useful heterosis were more pronounced for yield components traits. The maximum number of cross combinations that recorded significant and desirable heterobeltiosis was observed in boll weight followed by seed cotton yield, lint yield and fiber fineness.
This study was carried out through two successive growing seasons (2011 and 2012) and included si... more This study was carried out through two successive growing seasons (2011 and 2012) and included six parents and 15 F1 crosses; all these genotypes belong to Gossypium barbadense, L. were evaluated in a randomized complete blocks design with three replications in Sakha Research Station – Kafr El Sheikh. The results showed that, the mean squares due to genotypes were significant or highly significant for all studied traits. Also, significant heterosis values versus mid and better parent were detected and showed significance or highly significance for most studied traits. The relative importance (RI) of additive and non-additive gene effects can be obtained from the ratio of variance components for general to those of specific effects. Results cleared the predominance of variance due to GCA over SCA for all studied traits, indicating additive type of gene action involved for the control of those traits except for LI and fiber strength trait. Concerning the general combining ability (GCA) effects of diallel crosses the results revealed that the genotypes Giza 86 and Aus. 10229 x Giza 86 were best combiners for yield and yield component traits. The genotypes Giza 86 and Aus. 10229 were the best combiners for most fiber quality properties. The genotypes Aus. 10229 x Giza 86 and Giza 89 x Pima S6 were best combiners for earliness traits and the genotype Aus. 10229 x Giza 86 was the best combiner for oilseed contents traits. For specific combining ability (SCA) effects, results indicated that the crosses (P1 x P3) and (P2 x P4) were the best ones for yield and yield component traits. In addition, the combinations (P1 x P5), (P2 x P3), (P3 x P6), (P4 x P6) and (P1 x P6) for fiber quality properties that appeared to be the best crosses for these traits. While, the combinations (P1 x P2), (P1 x P4), (P2 x P4) and (P2 x P5) appeared to be the best crosses for earliness traits. In the same trend, the combination (P2 x P5) exhibited favorable SCA effects for the most oilseed traits. The results revealed that both phenotypic (σ2P) and genotypic (σ2g) variances were significant and large in magnitude for most studied traits. The results also cleared that the calculated values of heritability in broad sense (H2b%) ranged from 47.85 to 99.72% for uniformity index and gossypol content, respectively. Also, the estimates of phenotypic and genotypic coefficients of variation (PCV % and GCV %) were higher for first fruiting node (FFN), earliness index (EI), seed cotton yield /plant (SCY/P), lint yield /plant (LY/P), boll weight (BW), number of boll /plant (NB/P), lint index (LI), protein and gossypol contents than other studied characters.
Half diallel crosses among 6 genotypes of cotton (Gossypium barbadense L.) as well as their paren... more Half diallel crosses among 6 genotypes of cotton (Gossypium barbadense L.) as well as their parents were evaluated in a randomized complete block design aiming at investigating general combining ability (GCA) effects of parent, specific combining ability (SCA) effects of crosses and the heterotic pattern of the cross combinations. Results showed significant differences among all the crosses means and their respective parental values for all examined traits. The mean squares due to general combining ability (GCA) and specific combining ability (SCA) were also significant. Variances due to SCA were greater than these due to GCA for all studied traits, indicating the predominance of non-additive gene action. The parental genotypes P1, P3 and P5 were the best general combiners and their utilization produced valuable crosses with desirable SCA effects especially for yield components. The cross combinations (P1 x P2), (P1 x P3) and (P5 x P6) performed well in SCA determination and showed outstanding mean performance and heterosis for yield components traits. Better SCA effects associated with useful heterosis were more pronounced for yield components traits. The maximum number of cross combinations that recorded significant and desirable heterobeltiosis was observed in boll weight followed by seed cotton yield, lint yield and fiber fineness.
This study was carried out through two successive growing seasons (2011 and 2012) and included si... more This study was carried out through two successive growing seasons (2011 and 2012) and included six parents and 15 F1 crosses; all these genotypes belong to Gossypium barbadense, L. were evaluated in a randomized complete blocks design with three replications in Sakha Research Station – Kafr El Sheikh. The results showed that, the mean squares due to genotypes were significant or highly significant for all studied traits. Also, significant heterosis values versus mid and better parent were detected and showed significance or highly significance for most studied traits. The relative importance (RI) of additive and non-additive gene effects can be obtained from the ratio of variance components for general to those of specific effects. Results cleared the predominance of variance due to GCA over SCA for all studied traits, indicating additive type of gene action involved for the control of those traits except for LI and fiber strength trait. Concerning the general combining ability (GCA) effects of diallel crosses the results revealed that the genotypes Giza 86 and Aus. 10229 x Giza 86 were best combiners for yield and yield component traits. The genotypes Giza 86 and Aus. 10229 were the best combiners for most fiber quality properties. The genotypes Aus. 10229 x Giza 86 and Giza 89 x Pima S6 were best combiners for earliness traits and the genotype Aus. 10229 x Giza 86 was the best combiner for oilseed contents traits. For specific combining ability (SCA) effects, results indicated that the crosses (P1 x P3) and (P2 x P4) were the best ones for yield and yield component traits. In addition, the combinations (P1 x P5), (P2 x P3), (P3 x P6), (P4 x P6) and (P1 x P6) for fiber quality properties that appeared to be the best crosses for these traits. While, the combinations (P1 x P2), (P1 x P4), (P2 x P4) and (P2 x P5) appeared to be the best crosses for earliness traits. In the same trend, the combination (P2 x P5) exhibited favorable SCA effects for the most oilseed traits. The results revealed that both phenotypic (σ2P) and genotypic (σ2g) variances were significant and large in magnitude for most studied traits. The results also cleared that the calculated values of heritability in broad sense (H2b%) ranged from 47.85 to 99.72% for uniformity index and gossypol content, respectively. Also, the estimates of phenotypic and genotypic coefficients of variation (PCV % and GCV %) were higher for first fruiting node (FFN), earliness index (EI), seed cotton yield /plant (SCY/P), lint yield /plant (LY/P), boll weight (BW), number of boll /plant (NB/P), lint index (LI), protein and gossypol contents than other studied characters.
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