12 アイスプラント(Mesembryanthemum crystallinum L.)において個体の成熟及び塩ストレスにより誘導されるCAM型光合成発現機構と植物ホルモン・ブラシノステロイドの関係

概要

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The ice plant (Mesembryanthemum crystallinum L.) is a succulent plant and a model to study stress response because it can be switched from C3 3 photosynthesis to Crassulacean acid metabolism (CAM) by development or salinity. Although roles of several plant hormones for its CAM induction had been tested, the mechanism was not able to elucidate clearly. To determine whether the plant hormone, brassinosteroid (BR), is responsible for this mechanism, we investigated a role of BR in the ice plant. BR activity in extracts of twelve-week-old plants was determined by rice lamina-joint inclinatkm assay. We found two distinct fractions containing BR activities after HPLC. Castasterone (CS) was identified in one of these fractions by GC-MS. Another active fraction was eluted at the same retention time of authentic brassinolide (BL), and the identification is in progress. We compared BR compositions between C3 and CAM plants. BL activity was observed in the CAM plant but not in the C3 plant, while CS activity was found in both plants. These results may lead a hypothesis that BL play a role in CAM induction of the ice plant.
植物化学調節学会の論文
2001-10-09