Fig. 6

K deficiency aggravates membrane lipid peroxidation and induces a flag leaf response to S. oryzae infection. a MDA and H₂O₂ contents and activities of SOD and POD. The error bars on the top of the point denote the least significant difference among treatments at the same sampling date at p < 0.05; the abbreviations of the treatments, K represent potassium; I represent inoculation with S. oryzae; “+” and “−” represent with or without K, respectively. b The contents of MGDG, DGDG, PC, and PG; “−” and “+” under the treatments denote before and 5 days upon inoculation. c Ultrastructure of a chloroplast in the flag leaf. In the picture, CW, SG, and F represent the cell wall, starch grain, and a lipid droplet, respectively. d Light and CO₂ response curves of the flag leaf