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Atcand1-1 is resistant to exogenous auxin in root elongation assays. A, Seedlings were germinated and grown on 100 nm 2,4-D under white light for 5 d. Atcand1-1 (right) displayed elongated primary roots. B, Effects of 2,4-D on root elongation. Both axr1-12 and Atcand1-1 displayed decreased sensitivities to exogenous auxin. C, Effects of IAA on root elongation. Note that the x axis is in log scale. D, Effects of ethylene biosynthetic precursor ACC on hypocotyl elongation in the dark.
