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Effects of JA on primary root growth and LR development in wild-type (Ws and Col-0) and mutant (drr1 and jar1) lines. A, Primary root length. B, Number of emerged LRs per plant. Data were recorded at 12 d after germination. Values shown are means ± sd (n = 20). Different letters represent means statistically different at the 0.05 level. The experiment was repeated three times with similar results.
