Biochemical and Associated Agronomic Traits in Gossypium hirsutum L. under High Temperature Stress

Heat tolerance is a physiologically and genetically complex trait regulated by multiple genes. To investigate the genetic basis of heat tolerance, eight parents (five lines three testers) their fifteen F1 hybrids were evaluated under normal high-temperature stress conditions for two consecutive years. Data recorded plant height, number bolls, boll weight, seed cotton yield, ginning out turn (GOT%), H2O2, catalase, peroxidase, super-oxidase dismutase, total soluble proteins, carotenoids, chlorophyll & b contents, short fiber index, strength, UHML, micronaire value, reflectance, uniformity index. Line × tester analysis suggested that contribution was higher than testers. Non-additive gene action observed all studied traits. The variances SCA greater GCA traits revealed these governed few largely dominant Fb-Shaheen, Eagle-2 JSQ White Gold found good general combiner whereas cross Fb-Shaheen specific significant better parent heterosis most during years high temperature conditions. information obtained could be utilized in breeding program development new synthetic varieties tolerance.