@inproceedings{oai:jaxa.repo.nii.ac.jp:00013844,
 author = {若林, 和幸 and 曽我, 康一 and 保尊, 隆享 and 神阪, 盛一郎 and Wakabayashi, Kazuyuki and Soga, Koichi and Hoson, Takayuki and Kamisaka, Seiichiro},
 book = {宇宙利用シンポジウム　第20回　平成15年度, Space Utilization Research: Proceedings of the Twentieth Space Utilization Symposium},
 month = {Mar},
 note = {Modifications of cell wall structure of wheat coleoptiles in response to continuous hypergravity (300 g) treatment were investigated. Growth of coleoptiles exposed to hypergravity for 2 to 4 days from germination stage was substantially reduced. The net amounts of cell wall polysaccharides of hypergravity-treated coleoptiles increased as much as those of 1 g control coleoptiles during the incubation period. As a result, the levels of cell wall polysaccharides per unit length of coleoptile, which mean the thickness of cell walls, largely increased under hypergravity conditions. In the hemicellulose fraction, a polysaccharide fraction extracted from cell walls with strong alkali, glucose (Glc), arabinose (Ara) and xylose (Xyl) were the major sugar components, and the ratios of Ara and Xyl to Glc were higher in hypergravity-treated coleoptiles than in control coleoptiles. Furthermore, the fractionation of hemicellulosic polymers into the neutral and acidic polymers by the anion-exchange column showed that the levels of acidic polymers (mainly composed of arabinoxylans) in cell walls of hypergravity-treated coleoptiles were higher than those of control coleoptiles. In addition to wall polysaccharides, the amounts of cell wall-bound phenolics, such as ferulic acid and diferulic acid, increased at the same extent in both hypergravity-treated and control coleoptiles. These results suggest that hypergravity stimuli from the germination stage do not restrict the net synthesis of cell wall constituents in wheat coleoptiles, although they bias the type of synthesized hemicellulosic polysaccharides. The stimulation of the synthesis of arabinoxylans may be involved in the structural changes, such as thickening of cell walls, under hypergravity conditions. These structural changes in cell walls may contribute to plant resistance to gravity stimuli., 資料番号: AA0046917039},
 pages = {121--124},
 publisher = {宇宙航空研究開発機構宇宙科学研究本部, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)},
 title = {イネ科植物の細胞壁構造に対する過重力の影響},
 year = {2004}
}