Fig. 2

Stomatal density of soybean leaves under shading and CK treatments. Stomatal density on the adaxial side of leaves under CK (a) and shading (b) treatments. Stomatal density on the abaxial side of leaves under CK (c) and shading (d) treatments. Significant differences between shading and CK treatments are indicated by different small letters (P < 0.05), respectively