Photosynthetica 2010, 48(4):623-629 | DOI: 10.1007/s11099-010-0080-x

Increase in unsaturated fatty acids in membrane lipids of Suaeda salsa L. enhances protection of photosystem II under high salinity

N. Sui1, M. Li2, K. Li1, J. Song1, B. S. Wang1,*
1 Key Lab of Plant Stress Research, College of Life Science, Shandong Normal University, Jinan, P.R. China
2 Shandong Academy of Agricultural Sciences, Jinan, P.R. China

In order to examine the possible role of unsaturated fatty acids in photosynthesis of halophytes under high salinity, the effect of salinity on plant growth, chlorophyll (Chl) content, photochemical efficiency of PSII, membrane lipid content and fatty acids composition of a C3 euhalophyte Suaeda salsa L. was investigated. Salt stress induced a slight increase of the maximal photochemical efficiency of PSII (Fv/Fm), actual PSII efficiency (ΦPSII), Chl a content and Chl a/b ratio. The unsaturated fatty acid content also increased under salt stress. The proportion of MGDG, DGDG, SQDG, and PC decreased, while the proportion of PG increased from 10.9% to 26.9% under salt stress. These results suggest that S. salsa displays high resistance to photoinhibition under salt stress and that increased concentration of unsaturated fatty acids in membrane lipids of S. salsa enhances the tolerance of photosystem II to salt stress.

Additional key words: chlorophyll; membrane lipid; photosystem; salt stress; Suaeda salsa; unsaturated fatty acids

Received: June 25, 2010; Accepted: October 28, 2010; Published: December 1, 2010  Show citation

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Sui, N., Li, M., Li, K., Song, J., & Wang, B.S. (2010). Increase in unsaturated fatty acids in membrane lipids of Suaeda salsa L. enhances protection of photosystem II under high salinity. Photosynthetica, 48(4), 623-629. doi: 10.1007/s11099-010-0080-x
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