| Stimulation of elongation growth and xyloglucan breakdown in Arabidopsis hypocotyls under microgravity conditions in space. | |
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MedLine Citation:
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PMID: 12355165 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Seedlings of Arabidopsis thaliana (L.) Heynh. (ecotype Columbia and an ethylene-resistant mutant etr1-1) were cultivated for 68.5, 91.5 and 136 h on board during the Space Shuttle STS-95 mission, and changes in the elongation growth and the cell wall properties of hypocotyls were analyzed. Elongation growth of dark-grown hypocotyls of both Columbia and etr1-1 was stimulated under microgravity conditions in space. There were no clear differences in the degree of growth stimulation between Columbia and etr1-1, indicating that the ethylene level was not abnormally high in the cultural environment of this space experiment. Microgravity also increased the mechanical extensibility of cell walls in both cultivars, and such an increase was attributed to the increase in the apparent irreversible extensibility. The levels of cell wall polysaccharides per unit length of hypocotyls decreased in space. Microgravity also reduced the weight-average molecular mass of xyloglucans in the hemicellulose-II fraction. Also, the activity of xyloglucan-degrading enzymes extracted from hypocotyl cell walls increased under microgravity conditions. These results suggest that microgravity reduces the molecular mass of xyloglucans by increasing xyloglucan-degrading activity. Modifications of xyloglucan metabolism as well as the thickness of cell wall polysaccharides seem to be involved in an increase in the cell wall extensibility, leading to growth stimulation of Arabidopsis hypocotyls in space. |
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Authors:
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Kouichi Soga; Kazuyuki Wakabayashi; Seiichiro Kamisaka; Takayuki Hoson |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2002-07-31 |
Journal Detail:
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Title: Planta Volume: 215 ISSN: 0032-0935 ISO Abbreviation: Planta Publication Date: 2002 Oct |
Date Detail:
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Created Date: 2002-09-30 Completed Date: 2003-01-23 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 1250576 Medline TA: Planta Country: Germany |
Other Details:
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Languages: eng Pagination: 1040-6 Citation Subset: IM; S |
Affiliation:
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Department of Biological Sciences, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan. soga@sci.osaka-cu.ac.jp |
Space Flight Mission:
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Flight Experiment; STS-95 Shuttle Project; manned; short duration |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological
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physiology* Arabidopsis / genetics, growth & development*, metabolism Cell Wall / chemistry, physiology Enzymes / metabolism Ethylenes / metabolism Extraterrestrial Environment* Glucans* Hypocotyl / growth & development*, metabolism Mutation Polysaccharides / analysis, metabolism* Stress, Mechanical Time Factors Weightlessness* Xylans* |
| Chemical | |
Reg. No./Substance:
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0/Enzymes; 0/Ethylenes; 0/Glucans; 0/Polysaccharides; 0/Xylans; 37294-28-3/xyloglucan; 74-85-1/ethylene |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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