Fig. 4.

Gas exchange characteristics of plants derived from two seed morphs of Suaeda splendens in response to treatment with a range of salt concentrations for 4 months. (A) Net photosynthetic rate, (B) stomatal conductance, (C) intercellular CO₂ concentration and (D) water use efficiency in randomly selected, fully expanded leaves. Plants grown from black and brown seeds as indicated. Values represent mean ± s.e., n = 5. Different letters indicate treatment means for each seed morph that are significantly different from each other (Tukey test; P < 0·05).