PJB-2019-116
Genetic manifestation of physio-morphic and yield related traits conferring thermotolerance in wheat
Adeel Khan, Munir Ahmad, Muhammad Kausar Nawaz Shah and Mukhtar Ahmed
Abstract
High temperature threatens the sustainability of wheat productivity. Knowledge of gene action and combining ability of parents assist the breeders to develop heat resilient wheat cultivars. Therefore, present study was designed to ascertain the combining ability of parents, nature of gene action and heritability under delayed planting mediated heat stress. Initially five heat tolerant genotypes were selected form 158 wheat genotypes on the basis of least cell membrane injury, high rate of photosynthesis, proline content, transpiration rate and cooler canopy temperature at seedling stage. Heat tolerant genotypes as male parents were crossed with ten high yielding genotypes as female parents following line × tester mating design. Fifty F1 hybrids along with 15 parents were evaluated under normal and heat stress for physio-morphic traits. Results revealed that all traits except stay green, plant height, leaf area, spike length and tillers per plant were controlled by additive genetic effects under both normal and heat stress conditions. High narrow sense heritability was noticed for canopy temperature depression at reproductive stage (65%), transpiration rate at seedling stage (73%), photosynthetic rate at seedling and reproductive (83%, 73%), proline content at seedling and reproductive (64%, 62%). High heritability with additive genetic effects suggested the utilization of these traits with modified pedigree selection for developing thermotolerant varieties
To Cite this article:
Khan, A., M. Ahmad, M.K.N. Shah and M. Ahmed. 2020. Genetic manifestation of physio-morphic and yield related traits conferring thermotolerance in wheat. Pak. J. Bot., 52(5): DOI: http://dx.doi.org/10.30848/PJB2020-5(27)
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