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Antioxidants and unsaturated fatty acids are involved in salt tolerance in peanut

文献类型： 外文期刊

作者： Liu, Shanshan 1 ; Wang, Wenqing 1 ; Li, Meng 2 ; Wan, Shubo 2 ; Sui, Na 1 ;

作者机构： 1.Shandong Normal Univ, Shandong Prov Key Lab Plant Stress, Coll Life Sci, Jinan 250014, Shandong, Peoples R China

2.Shandong Acad Agr Sci, Shandong Prov Key Lab Crop Genet Improvement Ecol, Jinan 250100, Shandong, Peoples R China

关键词： Antioxidant enzyme activity;Chlorophyll fluorescence;Salt stress;Fatty acid content;Peanut

期刊名称：ACTA PHYSIOLOGIAE PLANTARUM （ 影响因子：2.354； 五年影响因子：2.711 ）

ISSN：

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收录情况： SCI

摘要： To explore the possible physiological mechanism of salt tolerance in peanut, we investigated the effect of salinity on antioxidant enzyme activity, fatty acid composition, and chlorophyll fluorescence parameters. Seedlings at the initial growth stage had been treated with 0, 100, 150, 200, 250, and 300 mM NaCl for 7 days. Results showed that fresh mass and dry mass decreased with the rise of the NaCl concentration. They decreased significantly when the NaCl concentration was more than 200 mM. The PSII's highest photochemical efficiency (F-v/F-m) was not affected before treating 250 mM NaCl. However, the PSII (Phi PSII)'s actual photochemical efficiency of decreased after treating 200 mM NaCl. Both the initial fluorescence (F-o) and non-photochemical quenching (NPQ) increased after 200 mM NaCl treatment. PSI oxidoreductive activity (Delta I/I-o) was not affected before 200 mM NaCl. The malondialdehyde (MDA) content increased with the rise of the NaCl concentration. The activities of ascorbate peroxidase (APX) and superoxide dismutase (SOD) activities increased first and then decreased, while the content of H2O2 and O-2(-) decreased first and then increased. Treated with 150 mM NaCl, the linolenic acid (18:3) and linoleic acid (18:2) of monogalactosyldiacylglycerols (MGDG), digalactosyldiacylglycerols (DGDG), sulphoquinovosyldiacylglycerols (SQDG) as well as phosphatidylglycerols (PG), the ratio of DGDG/MGDG increased, and the opposite results were obtained with 300 mM NaCl. The double bond index (DBI) of MGDG, DGDG, SQDG, and PG also increased after treating 150 mM NaCl. These conclusions verified that increased unsaturated fatty acid content in membrane lipid of peanut leaves could improve salt tolerance by alleviating photoinhibition of PSII and PSI.

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