Fig. 3From: Elevated CO2 concentration induces photosynthetic down-regulation with changes in leaf structure, non-structural carbohydrates and nitrogen content of soybeanChanges in the morphological traits of stomata on the adaxial leaf surface (a-g) and abaxial leaf surface (A-G) of soybean leaves grown at CO2 concentrations of 400, 600, 800, 1000, 1200, 1400 and 1600 ppm observed with scanning electron microscopy. Bars = 5 μmBack to article page