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pxa1 is IBA resistant. A, Root elongation on IBA. Eight-day-old wild-type and mutant seedlings grown on the indicated concentrations of IBA under yellow-filtered light were removed from the agar, and the length of the primary root was measured. Error bars indicate the se values (n > 9). B, Root elongation on IAA. Primary root length on IAA was measured as described above. Error bars indicate the se values (n > 12).
