Genetic Analysis Foe Seed Cotton Yield Gossypium hirsutum L. And Its Components Using Generation Means

Abstract

The objective of the present investigation was to estimate genetic variance components and type of gene action controlling seed cotton yield and its components from other characters (number of fruiting branches, plant height, number of vegetative branches, number of bolls per plant, boll weight, seed index and lint index) of two crosses among upland cotton varieties, Alexander, Montana and Lachata, which was, the first (Alexander x Montana) and the second (Alexander x Lachata), by means of the six generations (P1, P2, F1, F2, B1 and B2) with two models, the first was (additive – dominance) and the second was (additive – dominance – epistasis). Chi square test was used to identify the adequacy of the first model, as well as the least squares method adopted in estimating the effects in both models. The results revealed that the estimated mean effects (m) were significant for all characters in both crosses, indicated that these characters quantitatively inherited. The additive – dominance model was adequate for number of fruiting branches, plant height, number of vegetative branches, number of bolls per plant, boll weight, seed index and lint index in both crosses, therefore epistasis was not important in the inheritance of these characters. Dominance gene effects were relatively more important than additive one in the inheritance of all characters in both crosses except boll weight and seed index in the second cross. Broad sense heritability varied from 15.89% for plant height in the first cross to 99.927% for the same character in the second cross. The additive genetic correlations of plant height and number of bolls per plant with seed cotton yield per plant was positive and significant in both crosses, indicating the possibility of using these two characters in improving yield.