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RePRPs are involved in the regulation of cell expansion by ABA. A, Tissue sections of root mature region in wild-type (WT), RePRP2.1(ox), and RePRP(Ri) plants grown in medium without ABA (−ABA) or with 1 μm ABA (+ABA) for 8 d. B, Average cortex cell lengths (means ± se) of wild-type, RePRP2.1(ox), and RePRP(Ri) plants. The average cell length was calculated based on 100 cells per tissue section. Asterisks indicate significant differences compared with the wild type (P < 0.01).
