Journal Article

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

Akitomo Nagashima, Yukiko Uehara and Tatsuya Sakai

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 49, issue 8, pages 1250-1255
Published in print August 2008 | ISSN: 0032-0781
Published online June 2008 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcn092
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

More Like This

Show all results sharing these subjects:

  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

GO

Show Summary Details

Preview

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

Journal Article.  2923 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.