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AtHB7 and AtHB12 contribute to primary root growth during normal development. Phenotype of 6-day-old AtHB7 (A) and AtHB12 (B) overexpression lines, SRDX (SUPERMAN repression domain) transgenic seedlings and mutants under standard growth condition. Primary root length in A (C) and B (D). Data are means ± SD (n = 24). Asterisks indicate significant differences between wild type and transgenic lines at *: p < 0.05 and **: p < 0.01 by Tukey’s test.
