Expression pattern of OsK5.2 outward Shaker channel gene in rice. A, Promoter::GUS construct (promoter region size: 2,339 bp). B to J, GUS activity in transgenic rice plants, revealed by an overnight incubation in the presence of X-Gluc: leaf tissues (B), stomata (C), leaf cross section (D), root (E), root tip (F), root cross section (G), flower (H), anther (I), and pollen (J).