Differential Effects of 1-Naphthaleneacetic Acid, Indole-3-Acetic Acid and 2,4-Dichlorophenoxyacetic Acid on the Gravitropic Response of Roots in an Auxin-Resistant Mutant of Arabidopsis, auxl

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Abstract
The agravitropic nature of root growth of an auxin-resistant mutant of Arabidopsis, auxl, was restored when the synthetic auxin 1-naphthaleneacetic acid (NAA) was added to the growth medium; auxl roots were not resistant to NAA. Neither indole-3-acetic acid nor 2,4-dichlorophenox-yacetic acid had the same effects as NAA. These differential effects of the three auxins on auxl defects suggest that AUX1 may encode the auxin influx carrier according to the model proposed by Oelbarre et al. [(1996) Planta 198: 532].