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Plant and Cell Physiology Advance Access originally published online on June 30, 2007
Plant and Cell Physiology 2007 48(8):1236-1241; doi:10.1093/pcp/pcm086
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© The Author 2007. 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

An Arabidopsis GH3 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*

Department of Chemistry, Seoul National University, Sillim-dong, Gwanak-gu, Seoul 151-742, Korea

*Corresponding author: E-mail, cmpark{at}snu.ac.kr; Fax, +82-2-889-1568.


  Abstract

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

Abbreviations: B, blue light; EOD, end-of-day; FR, far-red light; HR, hypersensitive reaction; PR, pathogenesis-related; R, red light; RT–PCR, reverse transcription–PCR; SA, salicylic acid; SAUR, small auxin-up RNA

(Received May 4, 2007; Accepted June 28, 2007)
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