Plant growth and development, and auxin polar transport in space: Based on the analysis using simulated microgravity conditions on a three-dimensional clinostat
Osaka Prefecture University Graduate School of Science
Osaka Prefecture University Graduate School of Science
Osaka Prefecture University Graduate School of Science
出版者
宇宙航空研究開発機構宇宙科学研究本部
出版者（英）
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)
雑誌名
宇宙利用シンポジウム 第23回 平成18年度
雑誌名(英)
Space Utilization Research: Proceedings of the Twenty-third Space Utilization Symposium
ページ
356 - 359
発行年
2007-03
抄録（英）
Plant shoots grow to the direction away from the gravity vector under 1 g conditions on earth. On the other hand, both true microgravity conditions in space (STS-95 space experiment) and simulated ones using a three-dimensional (3D) clinostat induced automorphosis together with significant inhibition of auxin polar transport in epicotyls of etiolated pea (Pisum sativum L. cv. Alaska) seedlings. In epicotyls of 2.5-d old (2.5 days old) etiolated pea seedlings, whose embryo axes in seeds were set in a horizontal position opposite to the direction of gravity, increased expression of an auxin-inducible gene, PsIAA4/5, was observed in the elongated side of epicotyls grown in a horizontal or an inclined (inclinational) position. Activities of auxin polar transport and gene expression of PsPIN1 encoding a facilitator protein of auxin polar transport were respectively asymmetrical in proximal and distal side of epicotyls, it being much higher in proximal side than in distal one. Auxin polar transport in the proximal side of epicotyls grown in an inclined (inclinational) position was significantly lower than in those grown in a horizontal position as well. Simulated microgravity conditions on a 3D clinostat were substantially changed the activities of auxin polar transport in proximal and distal side of epicotyls observed under 1 g conditions. These results strongly support the idea that gravistimulation induces changeable auxin polar transport and one-way lateral auxin distribution in epicotyls in early growth stage of etiolated pea seedlings.
宇宙環境下における植物の成長、発達とオーキシン極性移動:特に3次元クリノスタットにより作出された擬似微小重力環境を用いた解析
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