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Alternative cold response modes in Chlorella (Chlorophyta, Trebouxiophyceae) from Antarctica
Hu, Hanhua; Ll, Huiying; Xu, Xudong; Hu, HH, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
2008
Source PublicationPHYCOLOGIA
ISSN0031-8884
Volume47Issue:1Pages:28-34
AbstractChlorella was known to show enhanced antifreeze capability after cold hardening. We isolated Chlorella strains NJ-7 and NJ-18, which display alternative cold response modes from rock surfaces in Antarctica. On the basis of 18S ribosomal (rRNA) sequences, NJ-7 is an Antarctic type of Chlorella vulgaris; NJ-18 is also a 'true' Chlorella species but differs from any previously reported species in structure. NJ-7 partially retained the enhancing effects of low temperature cultivation on freeze tolerance, which correlates with an increase of C18:3-fatty acid content and up-regulation of two antifreeze protein genes. NJ-18, however, showed stable freeze tolerance regardless of the precultivation temperature. We propose that cold response modes vary widely in Chlorella and that the adaptation of C. vulgaris to Antarctica may serve as a model system for the evolution of antifreeze mechanisms in a single species of photosynthetic microorganism.; Chlorella was known to show enhanced antifreeze capability after cold hardening. We isolated Chlorella strains NJ-7 and NJ-18, which display alternative cold response modes from rock surfaces in Antarctica. On the basis of 18S ribosomal (rRNA) sequences, NJ-7 is an Antarctic type of Chlorella vulgaris; NJ-18 is also a 'true' Chlorella species but differs from any previously reported species in structure. NJ-7 partially retained the enhancing effects of low temperature cultivation on freeze tolerance, which correlates with an increase of C18:3-fatty acid content and up-regulation of two antifreeze protein genes. NJ-18, however, showed stable freeze tolerance regardless of the precultivation temperature. We propose that cold response modes vary widely in Chlorella and that the adaptation of C. vulgaris to Antarctica may serve as a model system for the evolution of antifreeze mechanisms in a single species of photosynthetic microorganism.
SubtypeArticle
KeywordAntarctica Antifreeze Chlorella Cold Response Modes
Department[Hu, Hanhua; Ll, Huiying; Xu, Xudong] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
Subject AreaPlant Sciences ; Marine & Freshwater Biology
DOI10.2216/07-28.1
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS Research AreaPlant Sciences ; Marine & Freshwater Biology
WOS SubjectPlant Sciences ; Marine & Freshwater Biology
WOS IDWOS:000252288800004
WOS KeywordSEA-ICE DIATOMS ; PHOTOSYNTHETIC ENERGY-CONVERSION ; EMBRYOGENESIS ABUNDANT PROTEINS ; FROST HARDINESS ; VULGARIS C-27 ; EXTREME CONDITIONS ; NITRATE REDUCTASE ; MESOPHILIC ALGA ; LIMITED GROWTH ; ELLIPSOIDEA
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Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/8306
Collection期刊论文
Corresponding AuthorHu, HH, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
AffiliationChinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Hu, Hanhua,Ll, Huiying,Xu, Xudong,et al. Alternative cold response modes in Chlorella (Chlorophyta, Trebouxiophyceae) from Antarctica[J]. PHYCOLOGIA,2008,47(1):28-34.
APA Hu, Hanhua,Ll, Huiying,Xu, Xudong,&Hu, HH, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China.(2008).Alternative cold response modes in Chlorella (Chlorophyta, Trebouxiophyceae) from Antarctica.PHYCOLOGIA,47(1),28-34.
MLA Hu, Hanhua,et al."Alternative cold response modes in Chlorella (Chlorophyta, Trebouxiophyceae) from Antarctica".PHYCOLOGIA 47.1(2008):28-34.
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