Univrsity of Tehran Press Iranian Journal of Field Crop Science 2008-4811 52 1 2021 03 21 Physiological and agronomic response of promise safflower genotypes to late season water deficit stress Physiological and agronomic response of promise safflower genotypes to late season water deficit stress 123 130 80982 10.22059/ijfcs.2020.293812.654667 FA Bahman Pasban Eslam Crop and Horticultural Science Research Department, East Azarbaijan Agricultural and Natural Resources Research and Education Center, AREEO, Tabriz, Iran 0000-0001-6116-5392 Amir Reza Sadeghi Bakhtevari Dept. of Agronomy and Plant Breeding, Faculty of Agriculture, Azarbaijan Shahid Madani University, Tabriz-Iran. Hamid Jabbari Seed and Plant Improvement Institute, AREEO, Karaj, Iran Ahmad Bybordi Soil and Water Science Research Department, East Azarbaijan Agricultural and Natural Resources Research and Education Center, AREEO, Tabriz, Iran Journal Article 2019 12 10 To investigate the effects of late season drought on yield components, seed and oil yields and some physiological indices related to drought tolerance in promise genotypes of safflower, an experiment was conducted as split plot based on a randomized complete blocks design with three replications in saline areas of the East Azarbaijan Agriculture and Natural Resources Research and Education Center during the cropping season of 2018-19. The experimental factors included drought stress (non-stressed and stressed from flowering to maturity) and six safflower genotypes (Padideh, Gazagi, 59, 68, 97 and 132 lines). Drought stress decreased yield components, seed and oil yields, leaf chlorophyll index, stomatal conductance and RWC and increased leaf temperature significantly. Amounts of these traits were significantly different among genotypes. Correlations among these indices and with seed and oil yields were significant. Also all yield components had important role in productivity. In all water conditions, Padideh variety and promise line 68 had higher amounts of physiological indices and indicated higher seed and oil yields. Therefore, Leaf chlorophyll index, stomatal conductance, RWC and leaf temperature are able to reflect the effects of water deficit on safflower genotypes and could be used in the drought tolerant genotypes selection. To investigate the effects of late season drought on yield components, seed and oil yields and some physiological indices related to drought tolerance in promise genotypes of safflower, an experiment was conducted as split plot based on a randomized complete blocks design with three replications in saline areas of the East Azarbaijan Agriculture and Natural Resources Research and Education Center during the cropping season of 2018-19. The experimental factors included drought stress (non-stressed and stressed from flowering to maturity) and six safflower genotypes (Padideh, Gazagi, 59, 68, 97 and 132 lines). Drought stress decreased yield components, seed and oil yields, leaf chlorophyll index, stomatal conductance and RWC and increased leaf temperature significantly. Amounts of these traits were significantly different among genotypes. Correlations among these indices and with seed and oil yields were significant. Also all yield components had important role in productivity. In all water conditions, Padideh variety and promise line 68 had higher amounts of physiological indices and indicated higher seed and oil yields. Therefore, Leaf chlorophyll index, stomatal conductance, RWC and leaf temperature are able to reflect the effects of water deficit on safflower genotypes and could be used in the drought tolerant genotypes selection. https://ijfcs.ut.ac.ir/article_80982_c9042f60f512e92f5ebfcbf053900723.pdf