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Plant and Cell Physiology Advance Access originally published online on June 13, 2008
Plant and Cell Physiology 2008 49(8):1250-1255; doi:10.1093/pcp/pcn092
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

The ABC Subfamily B Auxin Transporter AtABCB19 is Involved in the Inhibitory Effects of N-1-Naphthyphthalamic Acid on the Phototropic and Gravitropic Responses of Arabidopsis Hypocotyls

Akitomo Nagashima1,3, Yukiko Uehara1,3 and Tatsuya Sakai1,2,*

1Genetic Regulatory Systems Research Team, RIKEN Plant Science Center, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, 230-0045 Japan
2PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchi, Saitama, Japan

*Corresponding author: E-mail, tsakai{at}psc.riken.jp; Fax, +81-45-503-9591.


  Abstract

N-1-Naphthylphthalamic acid (NPA) causes the abnormal growth and development of plants by suppressing polar auxin transport. The mechanisms underlying this inhibition, however, have remained elusive. In Arabidopsis, we show that a defect in the ABC subfamily B auxin transporter AtABCB19 suppresses the inhibitory effects of NPA on hypocotyl phototropism and gravitropism, but not on hypocotyl elongation. Expression analysis using the auxin reporter gene DR5:GUS further suggests that NPA partially inhibits the asymmetric distribution of auxin in an AtABCB19-dependent manner. These data thus suggest that AtABCB19 plays an important role in the inhibitory effects of NPA on hypocotyl tropism induced by auxin.

Keywords: AtABCB19 - Auxin transport - Gravitropism - NPA - Phototropism - PIN3

Abbreviations: GUS, β-glucuronidase; NPA, N-1-naphthylphthalamic acid.

3These authors contributed equally to this work.

(Received April 28, 2008; Accepted June 10, 2008)
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