Osaka Prefecture University
Osaka Prefecture University
Graduate School of Life Science, Tohoku University
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)
Tohoku University
Chiba University
Utsunomiya University
University of Shizuoka
Hamamatsu Photonics K. K.
Institute for Environmental Sciences
Chiyoda Advanced Solutions Corporation
Toyama University
Osaka City University
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
Advanced Engineering Services
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)
雑誌名
宇宙利用シンポジウム
雑誌名(英)
Space Utilization Research: Proceedings of Space Utilization Symposium
The Twenty-sixth Space Utilization Symposium (January 25-26, 2010: ISAS/JAXA Sagamihara, Japan)
抄録（英）
A fundamental study was conducted to develop the experimental system to investigate effects of space environment on vegetative and reproductive growth of plants in their life cycles. Sap flow in plant stems plays an important role to transport fluid and nutrients internally from roots to leaves. In this study, the sap flow in tomato stems was assessed using a heat flow method at 0.01 and 1.0 g for 20 seconds each during parabolic airplane flights in order to clarify the effect of microgravity on the sap flow in stems. Heat generated with a small heater installed in the stem was transferred upstream and downstream by conduction and upstream by convection with the sap flow through xylems of the vascular tissue. Thermal images of stem surfaces near heated points were captured using infrared thermography and the internal heat convection corresponding to the sap flow was analyzed. In results, the sap flow in stems at 0.01 g was suppressed under a retarded air condition at a wind speed of 0.1 m/s compared with that at 1 g. No suppression of the sap flow was observed under a stirred air condition at a wind speed of 0.5 m/s. Suppressed sap flow in stems would be caused by suppression of transpiration in leaves and would cause restriction of water and nutrient uptake in roots. The forced air movement is essential to grow healthy plants under microgravity condition in space.
内容記述
形態: カラー図版あり
共催: 日本学術会議
著者人数: 16人
内容記述（英）
Physical characteristics: Original contains color illustrations
joint hosting: The Science Council of Japan
宇宙環境に対する植物反応解明のための実験系構築: 微小重力下での植物茎内の水の流れ
64730062.pdf
(454.61KB)
