Photosynthetica 2010, 48(3):355-360 | DOI: 10.1007/s11099-010-0046-z

Coordinate expression of light-harvesting chlorophyll a/b gene family of photosystem II and chlorophyll a oxygenase gene regulated by salt-induced phosphorylation in Dunaliella salina

W. M. Chen1, N. Jin1, Y. Shi1, Y. Q. Su1, B. J. Fei1, W. Li1, D. R. Qiao1,2, Y. Cao1,2,*
1 College of Life Sciences, Sichuan University, Chengdu, Sichuan, P. R. China
2 Sichuan Public Experimental Platform of Bioinformatics and Metabolic Engineering, Chengdu, Sichuan, P. R. China

As a stress factor, salt induces the phosphorylation of light-harvesting chlorophyll (Chl) a/b proteins (LHCII) in Dunaliella salina. In this study, we found that the salt-induced phosphorylation of LHCII was not affected by phosphatase, and that salt simultaneously regulated both the phosphorylation of LHCII and the expression of genes encoding light-harvesting Chl a/b proteins of photosystem II (lhcb) and the gene encoding Chl a oxygenase (cao) in dark-adapted D. salina. The mRNA accumulation patterns of lhcb and cao were similar, which further affected the size of LHCII and the ratio of Chl a to Chl b. Therefore, we inferred this simultaneous regulation is one of the mechanisms of D. salina to adapt to the high-salinity environment.

Keywords: Dunaliella salina; high salinity; light-harvesting chlorophyll a, b proteins; phosphorylation; simultaneous regulation

Received: August 18, 2009; Accepted: May 12, 2010; Published: September 1, 2010Show citation

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Chen, W.M., Jin, N., Shi, Y., Su, Y.Q., Fei, B.J., Li, W., Qiao, D.R., & Cao, Y. (2010). Coordinate expression of light-harvesting chlorophyll a/b gene family of photosystem II and chlorophyll a oxygenase gene regulated by salt-induced phosphorylation in Dunaliella salina. Photosynthetica, 48(3), 355-360. doi: 10.1007/s11099-010-0046-z.
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