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RePRP genes are specifically expressed in root elongation zones. Rice RePRP1.2 promoter was used to drive GUS expression in transgenic rice. GUS was expressed in roots of transgenic plants grown in medium without ABA (−ABA; A–C) or with 10 μm ABA (+ABA; D–F). In young roots, GUS was most prominently observed in the elongation zone below the root hair zone (B and E). In mature roots, GUS was detected in primary roots behind the meristem (C and F).
