Abstract
Heat tolerant wheat genotypes for late sown conditions identified on the basis of physiological traits
Highlights
Twenty wheat genotypes genotypes viz. WH 730, WH 1124, WH 1021, HD 3059, DBW 90, PBW 373, Raj 3765, HD 2851, HD 2285, PBW 550 (Heat Tolerant Genotypes) HD 2967, DBW 621, WH 1105, DBW 88, HD 3086, HD 2733, WH 711, WH 1080, WH 1142 and K 0307 were sown at field of Wheat and Barley Section, Department of Genetics and Plant Breeding, CCSHAU, Hisar, during crop seasons of 2016- 2017 under late sown condition by sowing in December in Randomized Block Design with three replications
Each plot was consist of 4 rows of 3m length with a 20×5 cm spacing within rows and between plants, respectivelyFlag leaf per selected plant was randomlychosen and tagged.The tagged leaves was used to measure physiological traits at anthesis and 14 days after anthesis (14DAA)
52.4-4.7 maximum transpiration rate was found in heat tolerant genotypes DBW 90 (10.67) and PBW 373 (7.58) at anthesis and 14DAA whereas minimum transpiration rate (5.22 and3.34 ) was observed in K 0307 at anthesis and 14 DAA
Summary
Water use efficiency (WUE) was calculated as: Water use efficiency = Photosynthetic rate/ stomatal conductance Significant differences existed among wheat genotypes tested for A, E, gs, WUE, chlorophyll content and CT at anthesis and 14 DAA (Table 1). Maximum Aat anthesis stage was observed in PBW 550 (18.57) and genotype WH 1021(14.24) has maximum photosynthetic rate 14 DAA. Identification of heat tolerant of wheat genotypes
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