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Responses of variables in the stomatal model to changes in leaf water potential (ψleaf). (A) n, a turgor-independent parameter representing the effects of hormonal signals on the sensitivity of guard cell osmotic pressure to leaf turgor. (B) a, the relative concentration of adenosine triphosphate. (C) π, leaf osmotic pressure. (D) The parameters normalized by their values at a ψleaf of 0 MPa. K, gas exchange based EFM estimation of Kleaf, as in Fig. 3C.
