Soil and Plant Water Relations Determine Photosynthetic Responses of C₃ and C₄ Grasses in a Semi‐arid Ecosystem under Elevated CO₂

Soil and plant water relations determine photosynthetic responses of C₃ and C₄ grasses in a semi-arid ecosystem under elevated CO₂

In a field study, LeCain et al. (pp. 41-52) show that acclimation in a C₃ grass almost eliminates a direct photosynthetic response to elevated CO₂, but enhances soil and plant water relations and improves seasonal carbon uptake in a C₃ and a C₄ grass.