61 国際宇宙ステーションにおけるシロイヌナズナ長期生育実験にむけての栽培環境試験

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Life cycle of plants is under the control of gravity. Whether or not the complete life cycle can be achieved under microgravity condition in space has not yet been elucidated, because many experiments done under microgravity condition in Cosmos and Space Shuttle have been carried out by comparing plant development between microgravity conditions in space and 1 g Condition on earth. The International Space Station (JSS) under construction is useful for elongation of the problcm, because Japanese Experiment Module (JEM) in ISS has plant growth faccilities to assess the effect of gravity on the life cycle of Arabidopsis plants in JEM of ISS. At present, we are aseptically eulturing Arabidopsis plants in the plant growth boxes (about 5 cubic cm), equipped with an illumination plate installed red and blue LED as light source. In the box illuminated from the side of the box, the hypocotyl grew toward lhe light source and elongated a little. In the box illuminated from the upper, the length of hypocotyls, the form and color of rosette leaves, and the growth rate of plants showed remarkable changes depending on light intcnsities.
2001-10-09