An Arabidopsis GH3 Gene, Encoding an Auxin-Conjugating Enzyme, Mediates Phytochrome B-Regulated Light Signals in Hypocotyl Growth | Zendy

J.-E. Park | Zendy; Pyoung Ju Seo | Zendy; A.-K. Lee | Zendy; Jae Hoon Jung | Zendy; Y.-S. Kim | Zendy; C.-M. Park | Zendy

Open Access

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

Author(s) -

J.-E. Park,

Pyoung Ju Seo,

A.-K. Lee,

Jae Hoon Jung,

Y.-S. Kim,

C.-M. Park

Publication year - 2007

Publication title -

plant and cell physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.975

H-Index - 152

eISSN - 1471-9053

pISSN - 0032-0781

DOI - 10.1093/pcp/pcm086

Subject(s) - hypocotyl , arabidopsis , phytochrome , auxin , mutant , biology , darkness , microbiology and biotechnology , phytochrome a , gene , botany , biochemistry , red light

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.

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