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INDUCING GENETIC VARIABILITY IN EGYPTIAN COTTON
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Abstract: This study was carried out at Sakha Experimental Station, Agricultural Research Center during three seasons 2014, 2015 and 2016. The study aimed to evaluate the induced variability in some quantitative characters of the Egyptian cotton genotypes using hybridization and/or the chemical mutagen (Di-Methyl-Sulphat) and to estimate some genetic parameters that clarify the inheritance of yield and its components as well as fiber quality of two cotton crosses. The results indicated that the mutagen treatment decreased the mean performance for most of the studied traitsand increased the variability for all traits in the two crosses. Hybridization increased variability in both of F2 and F3 untreated populations as compared with parents for most of the studied traits which reflects the effectiveness of hybridization in inducing variability in the studied materials. Moreover, crossing the mutagen treated parents increased variability than crossing alone. Heritability estimates showed relatively moderate values (exceeded 30%) for the traits boll weight; micronaire reading and fiber length while the other traits showed relatively low values. The expected genetic advance upon selection in F2 gave high values for the traits boll weight, lint yield, micronaire reading and fiber length in both treatments. Potence ratio revealed partial dominance for most of the studied traits. Both additive(d) and dominance(h) parameters were significant for the traits, boll weight, seed cotton yield and lint yield indicating that both additive and non-additive effects were important in the inheritance of these traits. The epistatic effects, additive x additive(i) and dominance x dominance(l) were significant for yield and its component traits in both crosses and both treatments indicating the important role of these interactions in the inheritance of such traits, whereas fiber quality traits showed insignificant
values epistatic effects.
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| Publication year |
2016
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| Pages |
290-305
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| Publication Type |
Journal
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