PJB-2020-352
ASSESSMENT OF GENETIC VARIABILITY AND HERITABILITY IN F4 POPULATION OF UPLAND COTTON (Gossypium hirsutum L.)
TANWEER FATAH ABRO
Abstract
It was essentially felt that cotton production must at any cost be exceeded to fulfil the necessities of the world’s day by day increasing population. Due to this reason, the current investigation was carried out to determine heritability and genetic advance for seed cotton yield and fiber characters of nine F4 upland cotton segregating populations originated from seven parental varieties during 2016-2017 in randomized complete block design with three replications. Analysis of variance exposed that among genotypes, parents, hybrids and parents vs. hybrids, significant differences were observed for all the studied attributes which expressed the genetic variation in the experiment. Results for heritability studies indicated that, the crosses CRIS-134 x Neelum-121, CRIS-134 x FH-113, CRIS-342 x Neelum-121, CRIS-342 x IR-3701, CRIS-342 x MNH-886 and CRIS-342 x FH-113 performed as the most superlative cross combinations for all characteristics. The hybrid CRIS-134 x FH-113 articulated the highest heritability estimates for plant height (95.24%). The maximum heritability for sympodial branches plant-1 (85.30%) and seed index (82.02%) were exhibited by the cross CRIS-342 x IR-3701. In case of bolls plant-1 (90.81%) and boll weight (96.85%), the cross-combination CRIS-342 x Neelum-121 displayed the highest heritabilities. For seed cotton yield plant-1 and ginning outturn, the most heritability percentage was confirmed by the cross CRIS-342 x MNH-886 (90.08 and 90.20%) and the highest heritability for staple length was discovered in the hybrid CRIS-134 x Neelum-121 (85.45%). It was finalized and suggested that a number of F4 populations indicated their potential for various seed cotton yield and fiber traits in heritability coupled with genetic advance for being promising and worthy of selection to improve many yield and fiber quality traits simultaneously in upland cotton.
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