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First published online March 28, 2008; 10.1104/pp.108.118174

Plant Physiology 147:169-178 (2008)
© 2008 American Society of Plant Biologists

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DEVELOPMENT AND HORMONE ACTION

SHORT HYPOCOTYL IN WHITE LIGHT1, a Serine-Arginine-Aspartate-Rich Protein in Arabidopsis, Acts as a Negative Regulator of Photomorphogenic Growth1,[W]

Shikha Bhatia, Sreeramaiah N. Gangappa, Ritu Kushwaha, Snehangshu Kundu and Sudip Chattopadhyay*

National Institute for Plant Genome Research, New Delhi 110067, India

Light is an important factor for plant growth and development. We have identified and functionally characterized a regulatory gene SHORT HYPOCOTYL IN WHITE LIGHT1 (SHW1) involved in Arabidopsis (Arabidopsis thaliana) seedling development. SHW1 encodes a unique serine-arginine-aspartate-rich protein, which is constitutively localized in the nucleus of hypocotyl cells. Transgenic analyses have revealed that the expression of SHW1 is developmentally regulated and is closely associated with the photosynthetically active tissues. Genetic and molecular analyses suggest that SHW1 acts as a negative regulator of light-mediated inhibition of hypocotyl elongation, however, plays a positive regulatory role in light-regulated gene expression. The shw1 mutants also display shorter hypocotyl in dark, and analyses of shw1 cop1 double mutants reveal that SHW1 acts nonredundantly with COP1 to control hypocotyl elongation in the darkness. Taken together, this study provides evidences that SHW1 is a regulatory protein that is functionally interrelated to COP1 and plays dual but opposite regulatory roles in photomorphogenesis.

1 This work was supported by the core grant of the National Institute for Plant Genome Research (to S.C.), Council of Scientific and Industrial Research fellowships (to S.N.G. and S.K.), and a University Grants Commission of India fellowship (to R.K.).

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Sudip Chattopadhyay (sudipchatto{at}yahoo.com).

[W] The online version of this article contains Web-only data.

www.plantphysiol.org/cgi/doi/10.1104/pp.108.118174

* Corresponding author; e-mail sudipchatto{at}yahoo.com.

Received February 20, 2008; accepted March 13, 2008; published March 28, 2008.

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