Fig. 1

Changes in stomatal conductance (gs) and net photosynthetic rate (Pn) of cotton leaves in response to drought stress and recovery. The periods are full squaring to flowering (S1), first flowering to full flowering (S2), full flowering to full boll setting (S3) and full boll setting to boll opening stage (S4), respectively. The water treatments were mild stress or 50–55% of maximum soil water (V1), moderate stressor 40–45% of maximum soil water (V2), and a well-watered check