Fig. 1From: Low pH-responsive proteins revealed by a 2-DE based MS approach and related physiological responses in Citrus leavesLeaf gas exchange in response to low pH. a CO2 assimilation; b stomatal conductance; c intercellular CO2 concentration. Bars represent means ± SE (n = 5). Different letters above the bars indicate a significant difference at P < 0.05Back to article page