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Gene action array related to morpho-physiological traits using population genetics in Triticum aestivum L.

Author(s)
Rana Haroon Maqsood Department of Plant Breeding & Genetics, University of Agriculture,Faisalabad,Pakistan
Ihsan Khaliq Department of Plant Breeding & Genetics, University of Agriculture,Faisalabad,Pakistan
Muhammad Kashif Department of Plant Breeding & Genetics, University of Agriculture,Faisalabad,Pakistan
Nisar Ahmed Centre of Agricultural Biochemistry & Biotechnology, University of Agriculture,Faisalabad,Pakistan
Abstract
Drought is a major constraint in grain production of bread wheat. Drought tolerant Pakistani line Chakawal-50 and drought susceptible line 9436 was crossed to develop F1, F2 and backcross generations. Genetic analysis was conducted for different traits (Stomatal conductance, photosynthetic rate, excised leaf water loss, relative water content, plant height, number of grains per spike and grain yield per plant). Presence of additive, dominance and epistatic components were identified for all traits under study. Gene action was found complex in nature except for plant height. Selection should be done in later generations for improvement of traits with complex gene action. Where selection in early generations was suggested due to significant additive component for plant height. Number of grains per spike showed medium while remaining traits showed high broad sense heritability. Number of grains per spike and stomatal conductance showed low while remaining traits showed medium narrow sense heritability. Relative water contents and number of grains per spike showed high while remaining traits showed low genetic advance. It was also suggested that selection in F2 and succeeding populations for variety development would result in improvement of all traits except for excised leaf water loss and plant height. In these traits hybrid breeding was suggested due to high heritability and low genetic advance.
Publication Details
Page(s) 513-519
DOI 10.21162/PAKJAS/18.5149
Published Journal: Pakistan Journal of Agricultural Sciences, Volume: 55, Issue: 3, Year: 2018

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Keywords
Genetic Advance, Heritability, photosynthetic rate, Epistasis
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