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Effects of salt stress on carbohydrate metabolism in desert soil alga Microcoleus vaginatus Gom.
Chen, Lan-Zhou; Li, Dun-Hai; Song, Li-Rong; Hu, Chun-Xiang; Wang, Gao-Hong; Liu, Yong-Ding; Liu, YD, Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China
2006-08-01
Source PublicationJOURNAL OF INTEGRATIVE PLANT BIOLOGY
ISSN1672-9072
Volume48Issue:8Pages:914-919
AbstractThe effects of salt stress on carbohydrate metabolism in Microcoleus vaginatus Gom., a cyanobacterium isolated from desert algal crusts, were investigated in the present study. Extracellular total carbohydrates and exopolysaccharides (EPS) in the culture medium produced by M. vaginatus increased significantly during the growth phase and reached a maximum during the stationary phase. The production of extracellular carbohydrates also significantly increased under higher salt concentrations, which was attributed to an increase in low molecular weight carbohydrates. In the presence of NaCl, the production of cellular total carbohydrates decreased and photosynthetic activity was impaired, whereas cellular reducing sugars, water-soluble sugars and sucrose content and sucrose phosphate synthase activity increased, reaching a maximum in the presence of 200 mmol/L NaCl. These parameters were restored to original levels when the algae were transferred to a non-saline medium. Sodium and K+ concentrations of stressed cells decreased significantly and H+-ATPase activity increased after the addition of exogenous sucrose or EPS. The results suggest that EPS and sucrose are synthesized to maintain the cellular osmotic equilibrium between the intra- and extracellular environment, thus protecting algal cells from osmotic damage, which was attributed to the selective exclusion of cellular Na+ and K+ by H+-ATPase.; The effects of salt stress on carbohydrate metabolism in Microcoleus vaginatus Gom., a cyanobacterium isolated from desert algal crusts, were investigated in the present study. Extracellular total carbohydrates and exopolysaccharides (EPS) in the culture medium produced by M. vaginatus increased significantly during the growth phase and reached a maximum during the stationary phase. The production of extracellular carbohydrates also significantly increased under higher salt concentrations, which was attributed to an increase in low molecular weight carbohydrates. In the presence of NaCl, the production of cellular total carbohydrates decreased and photosynthetic activity was impaired, whereas cellular reducing sugars, water-soluble sugars and sucrose content and sucrose phosphate synthase activity increased, reaching a maximum in the presence of 200 mmol/L NaCl. These parameters were restored to original levels when the algae were transferred to a non-saline medium. Sodium and K+ concentrations of stressed cells decreased significantly and H+-ATPase activity increased after the addition of exogenous sucrose or EPS. The results suggest that EPS and sucrose are synthesized to maintain the cellular osmotic equilibrium between the intra- and extracellular environment, thus protecting algal cells from osmotic damage, which was attributed to the selective exclusion of cellular Na+ and K+ by H+-ATPase.
SubtypeArticle
KeywordCarbohydrate Metabolism Desert Cyanobacteria Exopolysaccharides (Eps) Osmotic Equilibrium Salt Stress
DepartmentChinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China; Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China
Subject AreaBiochemistry & Molecular Biology ; Plant Sciences
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS Research AreaBiochemistry & Molecular Biology ; Plant Sciences
WOS SubjectBiochemistry & Molecular Biology ; Plant Sciences
WOS IDWOS:000239510200005
WOS KeywordSTABILIZATION ; DESICCATION ; SOLUTES ; SUCROSE ; CRUSTS
Citation statistics
Cited Times:40[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/8892
Collection期刊论文
Corresponding AuthorLiu, YD, Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China
Affiliation1.Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China
2.Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Chen, Lan-Zhou,Li, Dun-Hai,Song, Li-Rong,et al. Effects of salt stress on carbohydrate metabolism in desert soil alga Microcoleus vaginatus Gom.[J]. JOURNAL OF INTEGRATIVE PLANT BIOLOGY,2006,48(8):914-919.
APA Chen, Lan-Zhou.,Li, Dun-Hai.,Song, Li-Rong.,Hu, Chun-Xiang.,Wang, Gao-Hong.,...&Liu, YD, Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan 430072, Peoples R China.(2006).Effects of salt stress on carbohydrate metabolism in desert soil alga Microcoleus vaginatus Gom..JOURNAL OF INTEGRATIVE PLANT BIOLOGY,48(8),914-919.
MLA Chen, Lan-Zhou,et al."Effects of salt stress on carbohydrate metabolism in desert soil alga Microcoleus vaginatus Gom.".JOURNAL OF INTEGRATIVE PLANT BIOLOGY 48.8(2006):914-919.
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