| Klebsormidium flaccidum, a charophycean green alga, exhibits cold acclimation that is closely associated with compatible solute accumulation and ultrastructural changes. | |
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MedLine Citation:
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PMID: 18315534 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To elucidate the fundamental mechanisms and subsequent evolutionary aspects of plant cold acclimation, we examined the effect of cold acclimation on freezing tolerance in Klebsormidium flaccidum, a green alga belonging to Charophyceae, a sister group of land plants. Freezing tolerance of K. flaccidum was significantly enhanced by cold treatment: survival increased from 15% at -10 degrees C when grown at 18 degrees C to 55 and 85% after exposure at 2 degrees C for 2 and 7 d, respectively. Accompanying the development of freezing tolerance, soluble sugars (glucose and sucrose), a putative glycoside and amino acids, including gamma-aminobutyric acid (GABA), accumulated to high levels in the alga, suggesting that these solutes play a crucial role in the cold acclimation of K. flaccidum. Interestingly, the application of abscisic acid (ABA) did not change the freezing tolerance of the alga. We also observed changes in cell structure, including increased numbers and sizes of starch grains in chloroplasts, chloroplast enlargement, vacuole size reduction and cytoplasmic volume increase. These results suggest that K. flaccidum responds well to cold treatment and develops freezing tolerance in a process comparable to that of land plants. |
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Authors:
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Manabu Nagao; Kenji Matsui; Matsuo Uemura |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-02-28 |
Journal Detail:
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Title: Plant, cell & environment Volume: 31 ISSN: 1365-3040 ISO Abbreviation: Plant Cell Environ. Publication Date: 2008 Jun |
Date Detail:
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Created Date: 2008-05-09 Completed Date: 2008-10-27 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9309004 Medline TA: Plant Cell Environ Country: United States |
Other Details:
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Languages: eng Pagination: 872-85 Citation Subset: IM |
Affiliation:
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Cryobiosystem Research Center, Faculty of Agriculture, Iwate University, Morioka 020-8550, Japan. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Abscisic Acid
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pharmacology Acclimatization / physiology* Algae, Green / drug effects, physiology*, ultrastructure* Amino Acids / metabolism Carbohydrate Metabolism Carbohydrates / chemistry Freezing |
| Chemical | |
Reg. No./Substance:
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0/Amino Acids; 0/Carbohydrates; 21293-29-8/Abscisic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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