Silicon alleviates salt and drought stress of Glycyrrhiza uralensis seedling by altering antioxidant metabolism and osmotic adjustment

被引:0
作者
Wenjin Zhang
Zhicai Xie
Lianhong Wang
Ming Li
Duoyong Lang
Xinhui Zhang
机构
[1] Ningxia Medical University,College of Pharmacy
[2] Ningxia Medical University,Ningxia Engineering and Technology Research Center of Hui Medicine Modernization, Ningxia Collaborative Innovation Center of Hui Medicine, Laboratory of Hui Ethnic Medicine Modernization, Ministry of Education
[3] Yantai Institute of Forestry Science,Laboratory Animal Center
[4] Ningxia Medical University,Desertification Control Institute
[5] Ningxia Academy of Agriculture and Forestry Sciences,undefined
来源
Journal of Plant Research | 2017年 / 130卷
关键词
Silicon; Reactive oxygen species; Antioxidant enzymes; Non-enzyme antioxidants; Osmotic adjustment; Salt and drought stress;
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中图分类号
学科分类号
摘要
This study was conducted to determine effect and mechanism of exogenous silicon (Si) on salt and drought tolerance of Glycyrrhiza uralensis seedling by focusing on the pathways of antioxidant defense and osmotic adjustment. Seedling growth, lipid peroxidation, antioxidant metabolism, osmolytes concentration and Si content of G. uralensis seedlings were analyzed under control, salt and drought stress [100 mM NaCl with 0, 10 and 20% of PEG-6000 (Polyethylene glycol-6000)] with or without 1 mM Si. Si addition markedly affected the G. uralensis growth in a combined dose of NaCl and PEG dependent manner. In brief, Si addition improved germination rate, germination index, seedling vitality index and biomass under control and NaCl; Si also increased radicle length under control, NaCl and NaCl—10% PEG, decreased radicle length, seedling vitality index and germination parameters under NaCl—20% PEG. The salt and drought stress-induced-oxidative stress was modulated by Si application. Generally, Si application increased catalase (CAT) activity under control and NaCl—10% PEG, ascorbate peroxidase (APX) activity under all treatments and glutathione (GSH) content under salt combined drought stress as compared with non-Si treatments, which resisted to the increase of superoxide radicals and hydrogen peroxide caused by salt and drought stress and further decreased membrane permeability and malondialdehyde (MDA) concentration. Si application also increased proline concentration under NaCl and NaCl—20% PEG, but decreased it under NaCl—10% PEG, indicating proline play an important role in G. uralensis seedling response to osmotic stress. In conclusion, Si could ameliorate adverse effects of salt and drought stress on G. uralensis likely by reducing oxidative stress and osmotic stress, and the oxidative stress was regulated through enhancing of antioxidants (mainly CAT, APX and GSH) and osmotic stress was regulated by proline.
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页码:611 / 624
页数:13
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