Exogenous proline reduces NaCl-induced damage by mediating ionic and osmotic adjustment and enhancing antioxidant defense in Eurya emarginata

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• 作者：Jia-Lang Zheng ; Lu-Yao Zhao ; Chang-Wen Wu ; Bin Shen…
• 关键词：Eurya emarginata ; Salt stress ; Oxidative ; osmotic ; and ionic stresses ; Proline application
• 刊名：Acta Physiologiae Plantarum
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：37
• 期：9
• 全文大小：741 KB
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• 作者单位：Jia-Lang Zheng (1)
  Lu-Yao Zhao (1)
  Chang-Wen Wu (1)
  Bin Shen (1)
  Ai-Yi Zhu (1)
  
  1. National Engineering Research Center of Marine Facilities Aquaculture, Zhejiang Ocean University, Zhoushan, 316022, People’s Republic of China
  
• 刊物主题：Plant Physiology; Plant Genetics & Genomics; Plant Biochemistry; Plant Pathology; Plant Anatomy/Development; Agriculture;
• 出版者：Springer Berlin Heidelberg
• ISSN：1861-1664

文摘

Proline accumulation at the cost of growth inhibition is commonly observed in plants subjected to salt stress, because an increased amount of energy is stored as nitrogen. The hypothesis tested in this study was that exogenous proline addition will alleviate deleterious effects of high salinity on plant growth. Eurya emarginata plants were treated with 10?mM proline and 200?mM NaCl for 35?days. Growth-related parameters were determined in leaves, including fresh weight, tissue water content, concentrations of malondialdehyde (MDA), proline, Na+, and K+, and activities of superoxide dismutase, catalase, peroxidase, glutathione peroxidase (GPX), H?+?-ATPase, pyrroline-5-carboxylate synthetase (P5CS) and proline dehydrogenase (PDH). Exogenous proline increased fresh weight, endogenous proline and K+ concentrations, and reduced Na+ and MDA concentrations in under salt treatment. These effects were not observed in non-salt-treated soil. Increased K+ and decreased MDA concentrations were associated with increased H+-ATPase activity and increased activities of antioxidant enzymes except GPX, respectively. Although P5CS activity was sharply reduced and PDH activity remained unchanged, exogenous proline compensated for the decrease in endogenous synthetic proline, indicating more energy stored as nitrogen would be used for growth. Correlations between enzyme activities and MDA or ion concentrations were observed, indicating that changes at the enzyme level may underlie the patterns of salt stress, and accordingly affect accumulation of ions and peroxide. Thus, exogenous proline significantly affected the salinity tolerance of Eurya emarginata, through diverse protective effects on water relations, ionic and osmotic adjustment, and antioxidant defense.