Fig 2. Changes of physiological indices of resistance to stress under the condition of increased atmospheric CO₂ levels and high temperature in key growth stages.

Note: (a)–(e) represents MDA, Pro, SP, SS and SOD, respectively; S, HB, and F stand for the seeding, heading and blooming, as well as the filling stage, respectively. Note: The number of days represents the days of different growth stages after rice transplanting; - symbol represents shortening; CK stands for control treatment, 400 μmol·mol⁻¹ +0°C; M stands for moderate treatment, 550 μmol·mol⁻¹ +2°C; H stands for intensive treatment, 650 μmol·mol⁻¹ +4°C. Note: a, b and c indicate significant differences at the 0.05 level in the same growth stage.