University of Toyama Graduate School of Science and Engineering
University of Toyama Graduate School of Science and Engineering
University of Toyama Graduate School of Science and Engineering
University of Toyama Graduate School of Science and Engineering
University of Toyama Graduate School of Science and Engineering
Kanazawa University Division of Functional Genomics, Advanced Science Research Center
Kanazawa University Division of Functional Genomics, Advanced Science Research Center
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24回 平成19年度
雑誌名(英)
Space Utilization Research: Proceedings of the Twenty-fourth Space Utilization Symposium
ページ
385 - 387
発行年
2008-03
抄録（英）
Lignification of secondary cell walls gives mechanical strength to plant bodies. Lignin deposition in secondary cell walls is assumed to be required for the evolution of land plants. Our previous study showed that the lignin content in a secondary cell wall fraction was significantly increased by hypergravity stimulus in Arabidopsis inflorescence stems. Our microarray data revealed that expression of genes involved in auxin signalings and metabolisms was modulated in response to hypergravity as well as those which are involved in lignin biosynthesis. In the present study, we investigated the effect of hypergravity on auxin dynamics in inflorescence stems using DR5::GUS (beta-glucuronidase) plants and examined whether auxin dynamics is involved in hypergravity-induced lignification. Intensive GUS staining was observed in inflorescence stems of DR5::GUS plants by hypergravity condition. However, such DR5::GUS expression was cancelled by the TIBA (2,3,5-triiodobenzoic acid) treatment, while the promotion of lignin synthesis was not. These results suggest that, in inflorescence stems, the hypergravity-induced increase in endogenous auxin level is not involved in the hypergravity-induced promotion of lignin synthesis.
過重力刺激がシロイヌナズナの花茎におけるリグニン形成とオーキシン動態に与える影響
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