Figure 1.
Expression of SAG201/SAUR36 during leaf senescence in Arabidopsis. A, Phenotypes of leaf senescence in wild-type plants. YL, Expanding young leaf; ML, mature leaf that is fully expanded but with no visible yellowing; ES, early senescence leaf, with about 25% leaf area yellowing; MS, middle senescence leaf, with about 50% leaf area yellowing; LS, late senescence leaf, with more than 50% leaf area yellowing. B, Relative expression of SAG201/SAUR36 during leaf senescence. The expression levels were determined using qPCR. The expression levels in young leaves were set to 1. Data represent mean values ± se of three replicates. Letters indicate significant differences by Student’s t test (P = 0.05). C, GUS staining in senescing leaves of PSAG201/SAUR36-GUS transgenic Arabidopsis plants at 40 DAE. [See online article for color version of this figure.]