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CO2 assimilation rates as a function of leaf relative water content (RWC) and water potential (Ψleaf) in four C4 grasses growing in a drying soil: Astrebla lappacea, Bothriochloa bladhii, Cenchrus ciliaris and Panicum coloratum. Measurements were made at 28 °C, 1000 µmol quanta m–2 s–1, and ambient [CO2] of either 350 (open symbols) or 2500 µbar (closed symbols). Adapted from Ghannoum et al. (2003).
