Abstract
Climate change leads to increase in temperature of wheat growing regions with adverse effects on its yield. Breeding wheat genotypes for high temperature tolerance and yield related characters is a dire need of the day. This study was designed to evaluate eleven accessions of wheat including seven heat tolerant lines and four heat susceptible testers and they were crossed in line into tester mating design. The resultants F1 hybrids and their parents were assessed for heat tolerance in open field and field covered with plastic sheet tunnel (to artificially induce heat stress). At maturity, data were taken on morphological and physiological factors for estimation of genetic variation and combining ability effects. Highly significant variability was detected among genotypes for all studied parameters. Existing genetic variability among genotypes, under natural and heat stress treatments, showed the potential of present breeding material. These entries may be used in future to develop heat tolerant genotypes. Combining ability analysis showed the variable trend of general combining effects between lines and testers, and specific combining effects among combinations. In lines HTSBWON-15-0079, HTSBWON-15-0040 and HTSBWON-15- 0089 and testers HTSBWON-15-0014 and Millat-11 were best general combiners in both circumstances. Outcomes of specific combining ability showed that crosses HTSBWON-15-0079 × HTSBWON-15-0014, HTSBWON-15-0079 × Millat-11 and HTSBWON-15-0040 × Millat-11 were best specific combiners for heat related traits like canopy temperature and electrolyte leakage. Non additive type of genetic effect was exhibited by almost all characters.
Mariam Hassan. (2021) COMPUTATION OF COMBINING ABILITY ESTIMATES FOR SOME PHYSIOLOGICAL AND MORPHOLOGICAL TRAITS IN BREAD WHEAT UNDER HIGH TEMPERATURE, Pakistan Journal of Agricultural Sciences, Volume 58, Issue 2.
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