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JXB Advance Access originally published online on January 22, 2007
Journal of Experimental Botany 2007 58(5):1143-1150; doi:10.1093/jxb/erl274
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© 2007 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Auxin response, but not its polar transport, plays a role in hydrotropism of Arabidopsis roots

Tomoko Kaneyasu, Akie Kobayashi, Mayumi Nakayama, Nobuharu Fujii, Hideyuki Takahashi and Yutaka Miyazawa*

Graduate School of Life Sciences, Tohoku University, Sendai, 980-8577, Japan

* To whom correspondence should be addressed. E-mail: miyazawa{at}ige.tohoku.ac.jp

Plants are sessile in nature, and need to detect and respond to many environmental cues in order to regulate their growth and orientation. Indeed, plants sense numerous environmental cues and respond via appropriate tropisms, and it is widely accepted that auxin plays an important role in these responses. Recent analyses using Arabidopsis have emphasized the importance of polar auxin transport and differential auxin responses to gravitropism. Even so, the involvement of auxin in hydrotropism remains unclear. To clarify whether or not auxin is involved in the hydrotropic response, Arabidopsis seedlings were treated with inhibitors of auxin influx (3-chloro-4-hydroxyphenylacetic acid), efflux (1-naphthylphthalemic acid and 2,3,5-triiodobenzoic acid), and response (p-chlorophenoxyisobutylacetic acid), and their effects were examined on both hydrotropic and gravitropic responses. In agreement with previous reports, gravitropism was inhibited by all the chemicals tested. By contrast, only an inhibitor of the auxin response (p-chlorophenoxyisobutylacetic acid) reduced hydrotropism, whereas inhibitors for influx or efflux of auxin had no effect. These results suggest that auxin response, apart from its polar transport, plays a definite role in hydrotropic response, and will evoke a new concept for the auxin-mediated regulation of tropisms.

Key words: Arabidopsis, auxin, p-chlorophenoxyisobutylacetic acid (PCIB), gravitropism, hydrotropism

Received 25 May 2006; Revised 16 November 2006 Accepted 17 November 2006


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[Abstract] [Full Text] [PDF]


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