Genetic analysis of biochemical, fiber yield and quality traits of upland cotton under high-temperature

To understand the effect of heat stress on morphology and physiology cotton, eight cotton genotypes with their 15F1 hybrids (five lines, three testers) were grown in field conditions under randomized complete block design (RCBD) two treatments i.e. normal high-temperature stresses replications followed by split-plot arrangement. Data collected for biochemical yield-related parameters. Mean values all studied traits reduced significantly whilst mean value lint%, catalase activity, total soluble proteins, peroxidase, carotenoids increased high-temperature. Under both conditions, number bolls, boll weight, seed yield, lint index, mass per boll, hydrogen peroxide content, carotenoids, chlorophyll contents had high heritability along genetic advance percent which revealed, these controlled additive gene action. The short fiber strength, fineness, upper half length peroxidase activity moderate showed, non-additive temperature FH-458, IUB-65, CRS-2, FH-313 good general combiners physicochemical traits. cross combination IUB-013× CRS-2 FH-458× specific combiner plant height yield quality traits, best VH-329× CRS-2. These identified parents combinations might be used improving already present commercial varieties stress.