Genetic Architecture of Morpho-Physiological Traits in Wheat Accessions under Terminal Heat Stress

Authors : Sachin SHEHRAWAT, Yogender KUMAR

Pages : 34-42

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Publication Date : 2021-01-01

Article Type : Research Paper

Abstract :This s tudy inves tigated genetic variability, character association and path analysis for 12 morphological and 6 physiological traits in fourty wheat accessions at CCS Haryana Agricultural University, Hisar during rabi 2018-19 growing season. The mean sum of squares due to genotypes were highly significant for all the morpho-physiological characters s tudied hereby indicates enough variability for selection of heat tolerant genotypes for further crop improvement. Phenotypic and genotypic coefficients of variation were recorded highes t for grain yield followed by biological yield, peduncle length and 1000 grain weight, signifying scope for genetic improvement through selection. High heritability coupled with high genetic advance was reflected for grain yield, peduncle length, biological yield, 1000 grain weight and plant height. Correlation studies showed significant and positive association of grain yield with biological yield, 1000 grain weight, harves t index, SPAD 1, SPAD 2, grains per spike, spike length, peduncle length, NDVI 2, NDVI 1 and tillers per plant. Biological yield exerted the highes t positive direct effect on grain yield followed by harves t index, SPAD1 and peduncle length. Hence, due emphasis should be given to these attributes for genetic improvement in wheat under heat stress condition.
Keywords : Genetic variability, correlation, path analysis, wheat, heat stress