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Plant and Cell Physiology, 1998, Vol. 39, No. 6 660-664
© 1998

Short Communication

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

Makoto Yamamoto and Kotaro T. Yamamoto1

Division of Biological Science, Graduate School of Environmental Earth Science, Hokkaido University Sapporo, 060-0810 Japan

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].

1To whom correspondence should be addressed. Fax: + 81-11-706-2253. e-mail: kty{at}ees.hokudai.ac.jp

(Received December 16, 1997; Accepted March 13, 1998)
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