Hassan, S. (2018). Genetic Analysis of some Quantitative Characters in Egyptian Cotton. Journal of Plant Production, 9(5), 469-475. doi: 10.21608/jpp.2018.35808
S. S. Hassan. "Genetic Analysis of some Quantitative Characters in Egyptian Cotton". Journal of Plant Production, 9, 5, 2018, 469-475. doi: 10.21608/jpp.2018.35808
Hassan, S. (2018). 'Genetic Analysis of some Quantitative Characters in Egyptian Cotton', Journal of Plant Production, 9(5), pp. 469-475. doi: 10.21608/jpp.2018.35808
Hassan, S. Genetic Analysis of some Quantitative Characters in Egyptian Cotton. Journal of Plant Production, 2018; 9(5): 469-475. doi: 10.21608/jpp.2018.35808
Genetic Analysis of some Quantitative Characters in Egyptian Cotton
Cotton Research Institute, Agricultural Research Center, Giza, Egypt.
Abstract
This study was carried out at Sakha Agricultural Station, ARC. during four seasons (2014 - 2017). Genetic analysis of F1, F2 and F3 made used to estimate the genetic variability and some genetic parameters that clarify the nature of gene action controlling inheritance of yield, its components and fiber quality of two Egyptian cotton crosses. Significant differences among the five populations (two Parents, F1, F2 and F3) were detected in both crosses for most studied indicating the parental genotypes exhibited sufficient genetic variability for further genetic studies. Hybridization increased the variation in F2 generation in both crosses compared with the parents for most of the studied traits indicating the effectiveness of hybridization in inducing the variabilities in the genetic materials. Among the four parents involved in this study, Giza 96 variety showed the highest values for productivity traits while Giza 93 had the best fiber quality traits. Concerning the gene effects, results indicated that the studied traits were quantitatively inherited. The additive effect (d) showed significant positive values for seed cotton yield, lint cotton yield, lint percentage, Fiber length and uniformity ratio in both crosses while the dominance effect (h) showed significant values for seed cotton yield, lint percentage, fiber strength and uniformity ratio in cross I and lint cotton yield, fiber strength and uniformity ratio in cross II . The epistatic effects showed that, Additive x additive interaction was prevalence for the inheritance of most traits while dominance x dominance interaction was less important. The results exhibited significant differences among the five generations (tow Parents, F1, F2, and F3) in both crosses for boll weigh, and lint cotton yield traits indicating that the parental genotypes exhibited genetic variability valid for further genetic studies. Hybridization increased the variability in F2 generation in both crosses as compared with their parents for seed cotton yield lint, cotton yield and micronaire in cross I and seed cotton yield in cross II. The studied traits indicated the effectiveness of hybridization in inducing variabilities in the studied materials. Concerning the gene effects results indicated that the studied traits were quantitatively inherited. The additive effect (d) showed significant positive values for boll weigh, seed cotton yield , lint cotton yield, lint percentage, fiber length and uniformity ratio traits while the dominance effect (h) showed significant values for seed cotton yield, lint percentage and uniformity ratio traits and it was larger in magnitude than the additive effect effect (d) in both crosses for all studied traits except boll weight and micronaire in cross I and cross II and Fiber strength in cross II. The epistatic effects showed that, additive x additive interaction (i) was prevalence for the inheritance of seed cotton yield, lint cotton yield, lint percentage and fiber length traits in cross I and boll weight and fiber strength in cross II, while dominance x dominance interaction (I) was larger important for lint cotton yield, lint percentage, fiber length and uniformity ratio in cross I and micronaire and uniformity ratio in cross II. Broad sense heritability showed high values for uniformity ratio in cross I and boll weight and seed cotton yield in cross II while it was relatively moderate values for boll weight, seed cotton yield, lint cotton yield, lint percentage, micronaire and fiber length in cross I and lint cotton yield, lint percentage and micronaire, while heritability in narrow sense and Parent–off spring regression showed low values for lint percentage, micronaire, fiber strength, fiber length and uniformity ratio in cross I and boll weight, seed cotton yield, lint cotton yield, lint percentage and fiber strength in cross II of the studied traits. The expected genetic advance from selecting the desired 5% of the F2 showed high values for fiber length in cross I and cross II, while moderate values were recorded for lint percentage in both crosses, while showed low values for other traits. The results partial dominance for lint cotton yield, lint percentage, micronaire, fiber strength, fiber length and uniformity ratio in cross I and seed cotton yield, lint cotton yield, lint percentage, micronaire, fiber length and uniformity in cross II while for boll weight and seed cotton yield in cross I and boll weight fiber strength and uniformity showed over dominance. Dominance was towards the higher parent in most cases. Inbreeding depression values were positive for boll weight and micronaire in cross I and boll weight, lint percentage and micronaire, these results were in harmony with the recorded reduction in the mean performance in F2 generation. Mid-parent heterosis in F1 populations was low for lint cotton yield, lint percentage and micronaire in cross I and lint cotton yield, lint percentage, micronaire, fiber strength, fiber length and uniformity ratio in cross II. Generally the pervious results exhibited that the important the each dominance and additive effects for controlling of genetic behavior for most traits. Thus, the recurrent selection and selection in later generation my be increase the genetic advance
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