Journal
PHOTOSYNTHETICA
Volume 48, Issue 4, Pages 623-629Publisher
SPRINGER
DOI: 10.1007/s11099-010-0080-x
Keywords
chlorophyll; membrane lipid; photosystem; salt stress; Suaeda salsa; unsaturated fatty acids
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Funding
- NSFC (National Natural Science Research Foundation of China) [30870138]
- China Postdoctoral Science Foundation [20090450155]
- Doctoral Foundation of Shandong Province [2009BSB02023]
- Postdoctoral Innovative Foundation of Shandong Province [200802009]
- Opening Foundation of the State Key Laboratory of Crop Biology, China [2008KF03]
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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 C-3 euhalophyte Suaeda salsa L. was investigated. Salt stress induced a slight increase of the maximal photochemical efficiency of PSII (F-v/F-m), actual PSII efficiency (I broken vertical bar(PSII)), 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.
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