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Plant and Cell Physiology Advance Access published online on March 9, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj026
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Plant and Cell Physiology 2006 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received January 16, 2006
Accepted February 25, 2006

Regular Paper

Overexpression of PRE1 and Its Homologous Genes Activates GA-Dependent Responses in Arabidopsis thaliana

Sumin Lee 1, Seunghee Lee 2, Ki-Young Yang 2, Young-Mi Kim 2, So-Yeon Park 1, Soo Young Kim 3, and Moon-Soo Soh 1 *

1 Department of Molecular Biology, Sejong University, 98 Gunja-Dong, Gwangjin-Gu, Seoul 143-747, Republic of Korea
2 Kumho Life & Environmental Science Laboratory, 1 Oryong-Dong, Buk-Gu, Gwangju 500-712, Republic of Korea
3 Kumho Life & Environmental Science Laboratory, 1 Oryong-Dong, Buk-Gu, Gwangju 500-712, Republic of Korea; Current address: Division of Applied Bioscience and Biotechnology, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, South Korea

* To whom correspondence should be addressed.
Moon-Soo Soh, E-mail: soh{at}sejong.ac.kr


  Abstract

Gibberellins (GAs) control various aspects of growth and development. Here, we identified a gene, designated paclobutrazol resistance1 by screening Arabidopsis activation-tagged lines. PRE1 encodes a helix-loop-helix protein and belongs to a small gene family. Physiological and genetic analysis indicated that overexpression of PRE1 altered various aspects of GA-dependent responses such as germination, elongation of hypocotyl/petiole, floral induction and fruit development and suppressed GA-deficient phenotypes of ga2 mutant. Expression of some GA-responsive genes was also affected by PRE1. Expression of PRE1 was shown to be early GA-inducible in the wild type plants and under control of SPY and GAI, upstream negative regulators of GA signaling. The shortened hypocotyl length phenotype of gai-1 mutant was suppressed by PRE1 overexpression. Ectopic overexpression of each of the four PRE1-related genes conferred similar pleiotropic phenotypes as PRE1-overexpression did, indicative of overlapping functions among PRE gene family. Our results of gain-of-function studies suggest that PRE genes may have a regulatory role in GA-dependent development in Arabidopsis thaliana.

Keywords: gibberellin; signaling; PRE1; helix-loop-helix; activation-tagging.
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