Figure 5.

Melatonin delayed the senescence of the detached wheat leaves. (A) Photograph of representative leaves in response to senescence treatment after melatonin and CdCl₂ (0.2 mM) + melatonin treatment. (B) Chlorophyll content upon senescence treatment at 10 d (n = 5). (C,D) In situ detection and quantification of the endogenous hydrogen peroxide at 24 and 48 h after senescence treatment (n = 5). Values are mean ± SE. L1 and L2 indicated the first and second leaf of the wheat seedlings. Bars = 1 cm. Significance between treatment and control was determined by Student’s t test. Significance level: * p < 0.05, ** p < 0.01.