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J. Biol. Chem., Vol. 281, Issue 31, 22190-22199, August 4, 2006

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A Basic Leucine Zipper Transcription Factor, G-box-binding Factor 1, Regulates Blue Light-mediated Photomorphogenic Growth in Arabidopsis^*

From the National Centre for Plant Genome Research, Laboratory 101, Aruna Asaf Ali Marg, New Delhi 110067, India

Several transcriptional regulators have been identified and demonstrated to play either positive or negative regulatory roles in seedling development. However, the regulatory coordination between hypocotyl elongation and cotyledon expansion during early seedling development in plants remains unknown. We report the identification of a Z-box binding factor (ZBF2) and its functional characterization in cryptochrome-mediated blue light signaling. ZBF2 encodes a G-box binding factor (GBF1), which is a basic leucine zipper transcription factor. Our DNA-protein interaction studies reveal that ZBF2/GBF1 also interacts with the Z-box light-responsive element of light-regulated promoters. Genetic analyses of gbf1 mutants and overexpression studies suggest that GBF1 acts as a repressor of blue light-mediated inhibition in hypocotyl elongation, however, it acts as a positive regulator of cotyledon expansion during photomorphogenic growth. Furthermore, whereas GBF1 acts as a positive regulator of lateral root formation, it differentially regulates the expression of light-inducible genes. Taken together, these results demonstrate that GBF1 is a unique transcriptional regulator of photomorphogenesis in blue light.

Received for publication, February 7, 2006 , and in revised form, April 24, 2006.

The nucleotide sequence(s) reported in this paper has been submitted to the Gen-Bank^TM/EBI Data Bank with accession number(s) AJ843257 [GenBank] .

^* This work was supported by a grant from Department of Science and Technology, the Government of India, and an internal grant from National Centre for Plant Genome Research (to S. C.). The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

¹ Recipients of Council of Scientific and Industrial Research fellowships from the Government of India.

² To whom correspondence should be addressed. Tel.: 91-11-2617-8614; Fax: 91-11-2671-6658; E-mail: sudipchatto{at}yahoo.com.

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