GENETIC VARIABILITY AND HERITABILITY STUDIES IN F3 SEGREGATING INTRA-HIRSUTUM COTTON (GOSSYPIUM HIRSUTUM L.) GENOTYPES

Abstract

Cotton as a significant cash crop is being used by a huge population in the world as fiber and shelter. The present study was aimed to investigate the inheritance studies in F3 segregating intra-hirsutum cotton (Gossypium hirsutum L.) genotypes. The results depicted that the analysis of variance revealed that the genotypes, parents, and hybrids were highly significant at P>0.01 and 0.05 probability level for the traits viz plant height (cm), sympodial branches plant-1 , number of bolls plant-1 , boll weight (g), ginning out turn- G.O.T (%), lint index, seed cotton yield plant-1(g), microniare value (µg inch-1), staple length (mm). Whereas parents and hybrids showed nonsignificant for number of bolls plant-1 , boll weight (g), seed cotton yield plant-1 , ginning outturn percentage, staple length (mm) and microniare value. Mean performance results depicted that taller plant height was observed in the parent AVP and Russian Red, respectively (98.67) and the minimum height was observed in the genotype BT-86 (96.00). The highest sympodial branches plant-1
, number of bolls plant-1 and seed cotton yield plant-1 revealed by the parent CEMB-30 (24.00; 38.33 and 123.67g) followed by BT-85 (20.33;38.33). BT-85 also exhibited more boll weight, seed index (2.86g and 7.75g) and seed cotton yield (124.00). The maximum seed cotton yield in kg per hectare, G.O.T% lint weight and microniare value was observed in the variety BT-85 (2559.7, 38.30, 4.76
and 4.36) followed by the genotype CEMB-30 (2555.3 and 37.90). Staple length was greater in Shahbaz (28.60) followed by IR-1513 with (28.26). The lowest sympodial branches plant-1 , boll weight, G.O.T %, lint weight and staple length were observed by Russian red (14.66; 5.10, 35.30, 2.76 and 27.56). The highest sympodial branches plant-1 , number of bolls plant-1 , G.O.T % and microniare value were observed from the cross Okra khaki x CEMB-30 (25.00; 40.33, 43.66 and 3.53) followed by IR1513 x CEMB-30 with maximum sympodial branches plant-1 , number of bolls plant-1 , seed index, seed cotton yield plant-1 , seed cotton yield in kg per hectare, lint weight and microniare value (22.00, 41.00,5.73g , 144.00, 3210.7, 4.03 and 3.63). Heritability estimates for plant height, sympodial branches plant-1 , number of bolls plant-1 , seed cotton yield plant-1 were greater in the hybrid FH168 x CEMB-30 (85.71% ,88.71%, 86.56% and 84.23%) along with genetic advance as 28.43, 4.43. 10.89. The boll weight revealed highest heritability and genetic advance in BT-86 x AVP (95.88% and 4.39) followed by IR1513 x CEMB-30 (91.005 and GA=3.02), respectively. Hence, among parents BT-86, CEMB-30 and BT-85 may be recommended as best parents and among the hybrids the cross-Okra khaki x CEMB-30 and IR1513 x CEMB-30 can be used for further selection.