Journal Article

Stimulation of Elongation Growth and Cell Wall Loosening in Rice Coleoptiles under Microgravity Conditions in Space

Takayuki Hoson, Kouichi Soga, Ryuji Mori, Mizue Saiki, Yukiko Nakamura, Kazuyuki Wakabayashi and Seiichiro Kamisaka

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 43, issue 9, pages 1067-1071
Published in print September 2002 | ISSN: 0032-0781
Published online September 2002 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcf126
Stimulation of Elongation Growth and Cell Wall Loosening in Rice Coleoptiles under Microgravity Conditions in Space

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We analyzed the growth rate and the cell wall properties of coleoptiles of rice seedlings grown at 23.6°C for 68.5, 91.5 and 136 h during the Space Shuttle STS-95 mission. In space, elongation growth of coleoptiles was stimulated and the cell wall extensibility increased. Also, the levels of the cell wall polysaccharides per unit length of coleoptiles and the relative content of the high molecular mass matrix polysaccharides decreased in space. These differences in the cell wall polysaccharides could be involved in increasing the cell wall extensibility, leading to growth stimulation of rice coleoptiles in space.

Keywords: Keywords: Cell wall extensibility — Coleoptile — Extraterrestrial space — Microgravity — Plant growth — Rice (Oryza sativa L.).; Abbreviations: BRIC, Biological Research in Canister.

Journal Article.  3366 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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