PJB-2009-321
GENETICS OF INHERITANCE AND CORRELATIONS OF SOME MORPHOLOGICAL AND YIELD CONTRIBUTING TRAITS IN UPLAND COTTON
MANZOOR HUSSAIN1*, FAQIR MUHAMMAD AZHAR2 AND ASIF ALI KHAN2
Abstract
Present investigations confined to genetic mechanisms controlling inheritance pattern of five morphological and yield-contributing traits and their interrelationships were made, by examining the six generations of cotton, through generation mean analysis during 2002-2004. While fitting the adequacy of five parameter models i.e. m, [d], [i], [j], [l] showed its adequacy for leaf area, m, [d], [h], [i], [j] for number of bolls, seed cotton yield and petiole length, whilst inadequacy of this model for boll weight, indicated the involvement of higher order of gene interaction controlling the boll weight expression. Potence ratio of value greater than unity exhibiting over-dominance was illustrated for four traits i.e., leaf area, number of bolls, boll weight and petiole length but for the trait of seed cotton yield potence ratio value was of 0.75 revealing partial dominance. Higher narrow sense heritability estimates (h2NS) ranging from 0.62 to 1.24 were observed for leaf area, petiole length, boll weight and seed cotton yield while, the moderate estimates of heritability (h2NS = 0.44) was revealed for number of bolls per plant. High heritability and significant positive associations measured among traits studied, suggested the possibility of improving seed cotton yield through indirect selection and conventional breeding techniques.
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