Genetic analysis of drought tolerance with respect to fiber traits in upland cotton

Abstract

Cotton germplasm was analyzed to investigate its potential for developing water stress tolerance in varieties in the future. Four tolerant (NIAB-78, CIM-482, BH-121, and VH-142) and four susceptible (CIM-446, FH-1000, FH-900, and FH-901) lines were identified of 50 accessions based on their seedling root length. A complete set of diallel crosses among eight selected genotypes was subjected to genetic analysis for fiber property traits. Additive and non-additive genetic variance was involved in the inheritance of fiber strength, fineness, and length under normal and drought conditions. A large proportion of genetic variance was additive, which was further supported by moderately high narrow-sense heritability estimates for the characters. Graphic representation of variance versus covariance also depicted additive gene activity with partial dominance and the absence of non-allelic interactions in trait inheritance. The results of this study suggest that drought tolerance of cotton genotypes can be improved through crosses among tolerant genotypes using conventional selection procedures in segregating generations.

A Line × Tester analysis for some seed cotton yield and fiber quality traits in upland cotton

“…For fiber fineness additive genetic effects were important which confirms the finding of Khan et al (2017), while finding of Kamaran et al (2018) reflected it as controlled by additive gene effects. For fiber strength, nonadditive genetic components appeared to be predominant this confirms the finding of Kamaran et al (2018), while Nasimi et al (2016) found that additive effects controlled the character. For fiber length non additive genetic components appeared to be predominant this confirms the finding of Kaleem et al (2016), while Coban and Unay (2017) showed that fiber length is controlled by additive gene action.…”

Screening Some Advanced Upland Cotton (Gossypium Hirsutum L.) Genotypes Tolerance Under Water Deficit

“…A large genetic and breeding population for drought tolerance was only briefly evaluated in a few studies [23,24,25,26]. However, research on how drought stress effects cotton yield at the crucial seedling stage is lacking.…”