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Published on March 28, 2008; 10.1104/pp.108.118174

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Received February 20, 2008
Accepted March 13, 2008

Short Hypocotyl in White Light (SHW1), a Serine-arginine-aspartate Rich Protein in Arabidopsis, Acts as a Negative Regulator of Photomorphogenic Growth

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

National Institute for Plant Genome Research, Aruna Asaf Ali Marg, New Delhi, India

* Corresponding author; email: sudipchatto{at}yahoo.com.

Light is an important factor for plant growth and development. We have identified and functionally characterized a regulatory gene, SHW1, involved in Arabidopsis 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 non-redundantly 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.






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