Silicon alleviates salt and drought stress of Glycyrrhiza uralensis seedling by altering antioxidant metabolism and osmotic adjustment
文献类型： 外文期刊
作者： Zhang, Wenjin 1 ; Xie, Zhicai 1 ; Wang, Lianhong 3 ; Li, Ming 5 ; Lang, Duoyong 4 ; Zhang, Xinhui 1 ;
作者机构： 1.Ningxia Med Univ, Coll Pharm, Yinchuan 750004, Peoples R China
2.Ningxia Med Univ, Ningxia Collaborat Innovat Ctr Hui Med, Ningxia Engn & Technol Res Ctr Hui Med Modernizat, Lab Hui Ethn Med Modernizat,Minist Educ, Yinchuan 750004, Peoples R China
3.Yantai Inst Forestry Sci, Yantai 264013, Shandong, Peoples R China
4.Ningxia Med Univ, Lab Anim Ctr, Yinchuan 750004, Peoples R China
5.Ningxia Acad Agr & Forestry Sci, Desertificat Control Inst, Yinchuan, Peoples R China
关键词： Glycyrrhiza uralensis;Silicon;Reactive oxygen species;Antioxidant enzymes;Non-enzyme antioxidants;Osmotic adjustment;Salt and drought stress
期刊名称：JOURNAL OF PLANT RESEARCH （ 影响因子：2.629； 五年影响因子：2.926 ）
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收录情况： SCI
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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Silicon promotes growth and root yield of Glycyrrhiza uralensis under salt and drought stresses through enhancing osmotic adjustment and regulating antioxidant metabolism
作者：Zhang, Wenjin;Yu, Xiaxia;Zhang, Xinhui;Xie, Zhicai;Zhang, Xinhui;Lang, Duoyong;Li, Ming
关键词：Osmotic stress; Oxidative stress; Silicon; Glycyrrhiza uralensis
