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题名: The response of carbohydrate metabolism to the fluctuation of relative humidity (RH) in the desert soil cyanobacterium Phormidium tenue
作者: Chen, Lanzhou1; Yang, Yan1; Deng, Songdiang1; Xu, Yanhong1; Wang, Gaohong2; Liu, Yongding2
通讯作者: Chen, LZ (reprint author), Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China
关键词: Biological soil crusts ; Exoplysaccharides (EPS) ; Desiccation ; Oxidative damage
刊名: EUROPEAN JOURNAL OF SOIL BIOLOGY
发表日期: 2012
DOI: 10.1016/j.ejsobi.2011.10.002
卷: 48, 页:11-16
收录类别: SCI
文章类型: Article
部门归属: [Chen, Lanzhou; Yang, Yan; Deng, Songdiang; Xu, Yanhong] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China; [Wang, Gaohong; Liu, Yongding] Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
资助者: foundation of Plan of Wuhan Scientific Chenguang of Young People[200850731367]; National Natural Science Foundation of China[30970446, 30500068, 30970688
类目[WOS]: Ecology ; Soil Science
研究领域[WOS]: Environmental Sciences & Ecology ; Agriculture
摘要: The excreting of exopolysaccharides (EPS) is thought as one of the main protection ways for cyanobacteria in desert algal crusts to survive desiccation. But how cyanobacteria adjust their carbohydrate metabolism to survive this stress is not elucidated. In this study, we treated Phormidium tenue, a cyanobacterium isolated from biological soil crusts with the changes of relative humidity (RH) to simulate different levels of desiccation and investigated its carbohydrate metabolism. It was found that photosynthetic activity (Fv/Fm) and cellular total carbohydrates production decreased significantly at low RH. But the production of EPS, reducing sugar, sucrose and the activity of sucrose phosphate synthase (SPS) increased significantly at low RH and reached maximum at 75% RH. Low RH could also cause the enhanced production of reactive oxygen species (ROS) generation, malondialdehyde (MDA) production and DNA strand breaks. However, when pretreated with exogenous 100 mg/L EPS, Fv/Fm and carbohydrate production were improved significantly, while ROS generation, MDA production and DNA strand breaks decreased significantly at various levels of RH in P tenue. These results indicated that P. tenue in arid regions could enhance desiccation tolerance by adjusting the carbohydrate metabolism to eliminate ROS and decrease oxidative damage. (C) 2011 Elsevier Masson SAS. All rights reserved.
英文摘要: The excreting of exopolysaccharides (EPS) is thought as one of the main protection ways for cyanobacteria in desert algal crusts to survive desiccation. But how cyanobacteria adjust their carbohydrate metabolism to survive this stress is not elucidated. In this study, we treated Phormidium tenue, a cyanobacterium isolated from biological soil crusts with the changes of relative humidity (RH) to simulate different levels of desiccation and investigated its carbohydrate metabolism. It was found that photosynthetic activity (Fv/Fm) and cellular total carbohydrates production decreased significantly at low RH. But the production of EPS, reducing sugar, sucrose and the activity of sucrose phosphate synthase (SPS) increased significantly at low RH and reached maximum at 75% RH. Low RH could also cause the enhanced production of reactive oxygen species (ROS) generation, malondialdehyde (MDA) production and DNA strand breaks. However, when pretreated with exogenous 100 mg/L EPS, Fv/Fm and carbohydrate production were improved significantly, while ROS generation, MDA production and DNA strand breaks decreased significantly at various levels of RH in P tenue. These results indicated that P. tenue in arid regions could enhance desiccation tolerance by adjusting the carbohydrate metabolism to eliminate ROS and decrease oxidative damage. (C) 2011 Elsevier Masson SAS. All rights reserved.
关键词[WOS]: DESICCATION TOLERANCE ; MICROCOLEUS-VAGINATUS ; OXIDATIVE DAMAGE ; SALT STRESS ; DNA-DAMAGE ; EXOPOLYSACCHARIDES ; CRUSTS ; POLYSACCHARIDES ; PHOTOSYNTHESIS ; INVOLVEMENT
语种: 英语
WOS记录号: WOS:000300036500002
ISSN号: 1164-5563
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/16757
Appears in Collections:水环境工程研究中心_期刊论文

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作者单位: 1.Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China
2.Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China

Recommended Citation:
Chen, Lanzhou; Yang, Yan; Deng, Songdiang; Xu, Yanhong; Wang, Gaohong; Liu, Yongding.The response of carbohydrate metabolism to the fluctuation of relative humidity (RH) in the desert soil cyanobacterium Phormidium tenue,EUROPEAN JOURNAL OF SOIL BIOLOGY,2012,48():41229
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