Abstract:
Stress tolerance indices are useful tools for evaluating plant responses to environmental stresses and identifying stresstolerant genotypes. To investigate genotypic differences and stress tolerance among wheat advanced lines, a field trial of 18 wheat lines with two local checks was conducted under irrigated and rain-fed conditions at PBG Farm, University of Agriculture Peshawar. The twenty wheat genotypes were evaluated in RCB design having three replications. Different stress indices i.e., tolerance index (TOL), mean productivity (MP), stress susceptibility index (SSI), yield stability index (YSI) and stress tolerance index (STI) were estimated to increase selection effectiveness and find the most promising advanced lines. Significant differences (P=0.01) were observed among genotypes for all studied traits except flag leaf area and spikelets spike-1. Similarly genotype by environment interaction was significant for days to maturity, grains spike-¹, 1000-seed weight and seed yield. Broad sense heritability and genetic advance values were low to moderate (1.04 - 49.4) for most of the traits. However, high heritability was observed for days to heading (?60) under rain-fed conditions. Low level of heritability and genetic advance values indicates that environmental effect was high on yield as well as yield related components and selection would be effective only in later generations. Similarly significant positive correlation of grain yield was observed with days to maturity (rp = 0.31**), plant height (rp = 0.47**), tillers m-2 (rp = 0.43**), plant biomass (rp = 0.82**) and harvest index (rp = 0.46**) under irrigated environment. Similarly seed yield had positive significant phenotypic interaction with 1000-seed weight (rp = 0.44**), biological yield (rp = 0.70**) and harvest index (rp = 0.46**) under rain-fed environment. In correspondence with stress indices, genotypes AUP-99 [STI (1.39), MP (68.9), TOL (277.8), SSI (-0.52) and YSI (0.99)] and AUP-106 [STI (0.75), MP (35.2), TOL (9.5), SSI (0.68) and YSI (0.73)] performed well for studied yield and yield related component. Based on mean performance of wheat advanced lines under both environments, AUP-58, AUP-99 and AUP-106 are recommended for use in future wheat breeding programs for authentication of current findings.
Page(s):
53-53
DOI:
DOI not available
Published:
Journal: Abstract Book on International Conference on Sustainable Agriculture and Food Security, August 27-31, 2023 , Volume: 0, Issue: 0, Year: 2023