Journal Article

An <i>Arabidopsis GH3</i> Gene, Encoding an Auxin-Conjugating Enzyme, Mediates Phytochrome B-Regulated Light Signals in Hypocotyl Growth

Jung-Eun Park, Pil Joon Seo, An-Kyo Lee, Jae-Hoon Jung, Youn-Sung Kim and Chung-Mo Park

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 48, issue 8, pages 1236-1241
Published in print August 2007 | ISSN: 0032-0781
Published online August 2007 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcm086
An Arabidopsis GH3 Gene, Encoding an Auxin-Conjugating Enzyme, Mediates Phytochrome B-Regulated Light Signals in Hypocotyl Growth

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

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An Arabidopsis GH3 gene WES1 encodes an auxin-conjugating enzyme that plays a role in stress responses by modulating endogenous levels of active auxin through a negative feedback regulation. Here, we report a photomorphogenic role for WES1 in hypocotyl growth. Hypocotyls of the WES1-overexpressing wes1-D and the knockout wes1 mutants were similar to control hypocotyls in darkness. However, the wes1-D hypocotyls were significantly shorter but the wes1 hypocotyls were longer than control hypocotyls under red light. Accordingly, WES1 transcription was up-regulated in a phytochrome B mutant. These results provide support for WES1 regulating hypocotyl growth by mediating phytochrome B-perceived light signals.

Keywords: Auxin; GH3 –– Hypocotyl growth; Light signaling; Phytochrome B

Journal Article.  2558 words.  Illustrated.

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

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