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Plant and Cell Physiology Advance Access originally published online on February 8, 2007
Plant and Cell Physiology 2007 48(3):555-561; doi:10.1093/pcp/pcm023
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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

Contribution of Gibberellin Deactivation by AtGA2ox2 to the Suppression of Germination of Dark-Imbibed Arabidopsis thaliana Seeds

Yukika Yamauchi1,2, Noriko Takeda-Kamiya1, Atsushi Hanada1, Mikihiro Ogawa1,3, Ayuko Kuwahara1,4, Mitsunori Seo1,4, Yuji Kamiya1 and Shinjiro Yamaguchi1,*

1RIKEN Plant Science Center, Suehiro-cho 1-7-22, Tsurumi-ku, Yokohama, Kanagawa, 230-0045 Japan

*Corresponding author: E-mail, shinjiro{at}postman.riken.jp; Fax, +81-45-503-9662.


  Abstract

Gibberellin levels in imbibed Arabidopsis thaliana seeds are regulated by light via phytochrome, presumably through regulation of gibberellin biosynthesis genes, AtGA3ox1 and AtGA3ox2, and a deactivation gene, AtGA2ox2. Here, we show that a loss-of-function ga2ox2 mutation causes an increase in GA4 levels and partly suppresses the germination inability during dark imbibition after inactivation of phytochrome. Experiments using 2,2-dimethylGA4, a GA4 analog resistant to gibberellin 2-oxidase, in combination with ga2ox2 mutant seeds suggest that the efficiency of deactivation of exogenous GA4 by AtGA2ox2 is dependent on light conditions, which partly explains phytochrome-mediated changes in gibberellin effectiveness (sensitivity) found in previous studies.

Keywords: Arabidopsis thaliana - AtGA2ox2 - Gibberellin - Gibberellin 2-oxidase - Phytochrome - Seed germination

Abbreviations: FR light, far-red light; 2ODD, 2-oxoglutarate-dependent dioxygenase; R light, red light.

2Present address: National Institute of Agrobiological Sciences (NIAS), Kannondai 2-1-2, Tsukuba, Ibaraki, 305-8602 Japan.

3Present address: CSIRO Plant Industry, Private Mail Bag, Merbein, VIC 3505, Australia.

4Present address: Laboratoire de Biologie des Semences, UMR 204 INRA-INAPG, Institut Jean-Pierre Bourgin, F-78026 Versailles Cedex, France.

(Received December 27, 2006; Accepted February 4, 2007)
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