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学科主题: Plant Sciences; Marine & Freshwater Biology
题名: Alternative cold response modes in Chlorella (Chlorophyta, Trebouxiophyceae) from Antarctica
作者: Hu, Hanhua1; Ll, Huiying1; Xu, Xudong1
通讯作者: Hu, HH, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
关键词: Antarctica ; antifreeze ; Chlorella ; cold response modes
刊名: PHYCOLOGIA
发表日期: 2008
DOI: 10.2216/07-28.1
卷: 47, 期:1, 页:28-34
收录类别: SCI
文章类型: Article
部门归属: [Hu, Hanhua; Ll, Huiying; Xu, Xudong] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Plant Sciences ; Marine & Freshwater Biology
研究领域[WOS]: Plant Sciences ; Marine & Freshwater Biology
摘要: 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.
英文摘要: 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.
关键词[WOS]: SEA-ICE DIATOMS ; PHOTOSYNTHETIC ENERGY-CONVERSION ; EMBRYOGENESIS ABUNDANT PROTEINS ; FROST HARDINESS ; VULGARIS C-27 ; EXTREME CONDITIONS ; NITRATE REDUCTASE ; MESOPHILIC ALGA ; LIMITED GROWTH ; ELLIPSOIDEA
语种: 英语
WOS记录号: WOS:000252288800004
ISSN号: 0031-8884
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/152342/8306
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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

Recommended Citation:
Hu, Hanhua; Ll, Huiying; Xu, Xudong.Alternative cold response modes in Chlorella (Chlorophyta, Trebouxiophyceae) from Antarctica,PHYCOLOGIA,2008,47(1):28-34
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