GENETIC VARIABILITY IN SEGREGATING GENERATIONS OF SOME COTTON CROSSES
Abstract: The breeding material used in this study consists of five parental cotton genotypes and their derived four F 1 and F 2 generations. The study was carried-out at Sakha Experimental Station, Agricultural Research Center, Kafr El-Sheikh, Egypt. The genotypes were evaluated to estimate the genetic components such as additive and dominance genetic variances, broad sense heritability and gain from selection using 5 % selection intensity in F 2 generation. Mean performance of the studied genotypes differed significantly for all the studied characters of four crosses. The estimates of Euclidean or straight line between five parental cotton genotypes were highly significant indicating the wide genetic dissimilarity and reflecting their different origin. Yield characters had positive values with right skewness for crosses I, III and IV, while, fiber quality characters had both directions. Crosses I, III and IV had negative kurtosis values for most yield and fiber characters expect, cross II which has positive sign for all the studied characters, except fiber strength and fiber length. Most estimates of additive genetic effect [a] were smaller than the dominance genetic effect [d] for the studied characters of four cotton crosses, except seed cotton yield in crosses I, III, and IV and lint percentage for crosses I and III. Correlated response was low between all the studied characters of the four crosses, except between boll weight with seed cotton yield, lint yield and lint percentage and between lint yield with seed cotton yield, their correlated response was very high. So, indirect selection for one of these characters could improve the others.
Publication year 2016
Pages 509 – 527
Organization Name
Project
Author(s) from ARC
Publication Type Journal
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