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2014 | 36 | 07 |
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Salinity improves chilling resistance in Suaeda salsa

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Suaeda salsa L., a C3 euhalophytic herb, is native to saline soils, demonstrates high resistance to salinity stress. The effect of chilling stress on S. salsa under high salinity, particularly the change in unsaturated fatty acid content within membrane lipids, has not been investigated. After a 12 h chilling treatment (4°C) performed under low irradiance (100 μmol m⁻² s⁻¹), the chlorophyll contents, maximal photochemical efficiency of photosystem II (Fv/Fm) and actual PSII efficiency (ΦPSII) were determined. These measurements were significantly decreased in S. salsa leaves in the absence of salt treatment yet there were no significant changes with a 200 mM NaCl treatment. Chlorophyll contents, Fv/Fm and ΦPSII in S. salsa under 200 mM NaCl were higher than those without salt treatment. The unsaturated fatty acid content and the double bond index (DBI) of major membrane lipids of monogalactosyldiacylglycerols, digalactosyldiacylglycerols (DGDG), sulphoquinovosyldiacylglycerols and phosphatidylglycerols (PG) significantly increased following the chilling treatment (4°C) (with 12 h of low irradiance and 200 mM of NaCl). The DBI of DGDG and PG was decreased in the absence of the salt treatment. These results suggest that in the euhalophyte S. salsa, a 200 mM NaCl treatment increases chilling tolerance under conditions of low irradiance (100 μmol m⁻² s⁻¹).
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  • Key Laboratory of Plant Stress Research, College of Life Science, Shandong Normal University, 250014 Jinan, People's Republic of China
  • Key Laboratory of Plant Stress Research, College of Life Science, Shandong Normal University, 250014 Jinan, People's Republic of China
  • Key Laboratory of Plant Stress Research, College of Life Science, Shandong Normal University, 250014 Jinan, People's Republic of China
  • Key Laboratory of Plant Stress Research, College of Life Science, Shandong Normal University, 250014 Jinan, People's Republic of China
  • Key Laboratory of Plant Stress Research, College of Life Science, Shandong Normal University, 250014 Jinan, People's Republic of China
  • Key Laboratory of Plant Stress Research, College of Life Science, Shandong Normal University, 250014 Jinan, People's Republic of China
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