highly significantp < 0.001
At 1 day of heat stress, genotype (G) had a highly significant ( p < 0.001) effect on photosynthetic rate (Pn), leaf conductance (Gs), transpiration (E), chlorophyll fluorescence traits (YII, NPQ, Fv/Fm), and carotenoid content (Cart), but not on chlorophyll-A (Chl-A), chlorophyll-B (Chl-B), or carotenoid (Cart).