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The nhx1nhx2nhx3nhx4 mutant exhibited less sensitivity to IAA and NAA but not to 2,4-D. (a–c). Primary root growth of WT and mutant grown on medium supplemented with IAA (a), NAA (b) and 2,4-D (c). Values are the mean ± S.D. (n = 15). Stars indicate significant differences between wild type (WT) and nhx1nhx2nhx3nhx4 (nhx1/2/3/4) in the same concentration of auxin. p < 0.05 by t test.
