Departmental Bulletin Paper 植物の光応答性を利用した太陽光エネルギー獲得の効率化に向けた研究(中間報告)(学内特別研究および国外研修,学内特別研究費報告書)

芳賀, 健  ,  Ken, Haga

Plants capture light energy from sunlight for photosynthesis using their adaptational systems. One of plant adaptational responses to light is phototropism. Phototropic responses conserved in all of plants are generated by differential growth between the irradiated side and the shaded side. According to the Cholodny-Went theory, unilateral light stimulation induces gradients of plant hormone auxin between the irradiated side and the shaded side, resulting in differential growth and a phototropic curvature. However, molecular mechanisms involved in phototropism have not been well-understood. One of key components is PIN-formed (PIN) proteins which function as auxin efflux carriers in plants. Therefore, this study first investigates roles of PIN proteins in phototropic responses using Arabidopsis which is one of model plants. Because Arabidopsis has eight PIN homologs, pin multiple mutants were produced by crossing a few pin single mutants and the multiple pin mutants were successfully produced. A useful information about molecular mechanisms of phototropism will be obtained by a detailed analysis of phototropic responses using the pin mutants.

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