Graduate School of Life Science, Tohoku University
Osaka City University
Osaka Prefecture University
Advanced Engineering Services (AES)
University of Toyama
Saitama University
Osaka Prefecture University
Osaka City University
Nara Institute of Science and Technology
Tohoku University
Osaka City University
Tohoku University
Osaka Prefecture University
National Institute for Basic Biology (NIBB)
Nara Institute of Science and Technology,
Japan Aerospace Exploration Agency (JAXA)
出版者
宇宙航空研究開発機構宇宙科学研究所 (JAXA)(ISAS)
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27回: 平成22年度
雑誌名(英)
Space Utilization Research, Vol. 27 2011: Proceedings of The Twenty-seventh Space Utilization Symposium
The Twenty-seventh Space Utilization Symposium (January 24-25, 2011. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)(ISAS)), Sagamihara, Kanagawa Japan
抄録（英）
Our studies are aimed at understanding the graviperception mechanism and its interactions with mechanisms of other gravity-influenced phenomena of plant growth and development. To understand the graviperception mechanisms, we isolated novel mutants defective in shoot or root gravitropism in Arabidopsis, identified the genes responsible for mutations, and clarified the roles of those molecules. In addition, we analyzed developmental phenomena that are regulated or influenced by graviresponse in plants as follows. It was found that graviresponse was required for circumnutation of rice coleoptiles as in dicotyledonous plants. Over-expression of MIZ1 resulted in an enhancement of hydrotropic response in Arabidopsis roots, independently from the magnitude of gravitropic response. Lateral placement of a peg in cucumber seedlings appeared to involve an auxin efflux carrier, CsPIN1, whose localization together with auxin distribution changed within 30 min after gravistimulation. Analyses of polar auxin transport and expression of ZmPIN1a revealed their roles in seedling development of maize coleoptiles, which could be used to establish a model for spaceflight experiment of the gravity-regulated growth and development of plants. To verify some of hypotheses obtained by our studies, we have conducted an experiment in KIBO module of ISS and prepared two others to be flown.
フロンティア生物の戦略: 植物の成長と重力受容システム
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