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ThesisItem Open Access Physiological studies in wheat genotypes (Triticum aestivum L.) under terminal high temperature conditions(CCSHAU, 2017) Pooja; Munjal, RenuThe present investigation was conducted to evaluate various physiological traits & identify promising wheat genotypes under terminal high temperature condition. The twenty genotypes i.e. ten tolerant (WH 730, WH 1124, WH 1021, HD 3059, DBW 90, PBW 373, Raj 3765, HD 2851, HD 2285, PBW 550) & ten heat susceptible (HD 2967, DPW 621, WH 1105, DBW 88, HD 3086, HD 2733, WH 711, WH 1080, WH 1142 & K 0307) were grown during rabi season of 2016 - 17 at Field Crop Research Area, of Wheat & Barley Section, Department of Genetics & Plant Breeding, CCS HAU, Hisar, The experiment was laid out in factorial RBD consisting of 4 rows of 3m length with a 20×5 cm spacing within rows & between plants, respectively. Terminal high temperature significantly influenced physiological, biochemical, yield & yield attributes in both heat susceptible & heat tolerant genotypes but the reduction was more pronounced in the susceptible genotypes in comparison to the tolerant ones. WH 1021 was adjudged to be most tolerant genotype due to minimum reduction in photosynthetic rate, transpiration rate, chlorophyll content & minimum increase in canopy temperature, cell membrane stability. WH 1021 also showed maximum no. of productive tiller/ m row length, biomass, grain yield, thousand grain weight & maximum harvest index. K 0307 was adjudged to be most susceptible due to maximum reduction in all physiological & biochemical trait except chlorophyll fluorescence & canopy temperature. K 0307 showed poor performance in yield & yield attributes. The tolerant genotype WH 1021 was found to be the most suitable one under terminal high temperature conditions on the basis of the overall picture of physiological, morpho-physiological & yield traits studied.