Elevated CO2 can modify the response to a water status gradient in a steppe grass: from cell organelles to photosynthetic capacity to plant growth.

Stomatal conductance ( g s ) increased with increasing water, but showed a decreasing trend under W 60 , and was stimulated by elevated CO 2 , except under extreme drought and excess water conditions (W 30 and W 60 ) (Fig. 4f ).

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With elevated CO 2 , the photosynthetic capacity showed an increasing trend under relative water deficit, but a decrease under water surplus conditions (W 30 and W 60 ) (Fig. 4a – c , e ).

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