Association of leaf chlorophyll content with the stay-green trait and grain yield in wheat grown under heat stress conditions

Heat stress is a major production constraint of wheat in South Asia, particularly the Gangetic plains India and Bangladesh. The leaf chlorophyll status key determinant for high rate photosynthesis under stress. present experiments included 238 genotypes 2016-2017 321 2017-2018 optimum heat conditions. Subsequently, set 100 selected on basis susceptibility index was evaluated 2018-2019 conditions to study relationship between important physiological traits yield A significant correlation soil plant analysis development (SPAD) value two upper leaves with stay-green trait grain indicates importance content, both flag penultimate leaf, maintaining areas greenness (LAUG) SPAD responsible 8.8% 10.9%, respectively, variation yield. For trait, 8.4% 7.2 % governed by respectively. These results suggest that, addition can be an criterion selection superior SW-139; SW 108; DWR-F8-35-9-1; NHP-F8-130; DWR-F8-3-1 that maintained content used further breeding programmes addressing resistance wheat.