Fig. 2

K⁺ deficiency affects the photosynthetic system of two different K⁺-sensitive sweetpotato cultivars, Xu32 and NZ1.The net photosynthetic rate (Pn) (A) and chlorophyll contents (B) of hydroponic-cultured sweetpotato seedlings under normal (Control) and K⁺-deficient conditions (-K) for two weeks. Date are means ± SE (n = 3). Different letters (a-d) denote significant differences at P < 0.05