Impaired ROS homeostasis in the ossweet1b mutants. A) DAB staining for the OsSWEET1b-OE plants, ossweet1b mutants, and WT flag leaf. Scale bars: 1 cm. B) H₂O₂ levels in the transgenic rice plants and WT flag leaf. C) SOD activity in the transgenic rice plants and WT flag leaf. D) POD activity in the transgenic rice plants and WT flag leaf. E) MDA activity in the transgenic rice plants and WT flag leaf. Data represent mean ± Se of 3 biological replicates. Asterisks in B), C), D), and E) indicate a significant difference between transgenic plants and WT as determined by 2-tailed Student's t test at **P < 0.01 or *P < 0.05.