Fig. 1.

Oxidative stress tolerance in representative seven rice cultivars. a Fv/Fm values before and after treatment with methyl viologen. b Specific ion leakage induced by treatment with methyl viologen. In a and b, Indica cultivars are shown with white bars, and Japonica cultivars are shown with black bars. Data represent means and standard deviations. n = 4. Student’s t test was performed on ‘after treatment’ data in (a) and data in (b). Different alphabets up to bars indicate significant difference between cultivars (P < 0.05). c Leaves stained with 3,3′-diaminobenzidine