Fig. 6.

Involvement of STM regulation by K-box in the AS1 pathway during leaf development. (A and B) Products by RT-PCR for AS1, AS2, and ACT2 mRNA in tissues containing the SAM and leaf primordia of Arabidopsis plants (A) and KNAT1 and ACT2 mRNA in leaves of Arabidopsis plants (B) are shown. (C and D) GUS expression in transgenic Arabidopsis seedlings harboring KNAT1p–GUS with or without ΔK-STM, respectively. Arrow and arrowheads indicate GUS expression in the leaf midvein and leaf hydathodes, respectively. (Scale bars: 2 mm.)