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(学内特別研究および国外研修)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(学内特別研究および国外研修) Studies for Development of Efficient Light Capture Systems Using Light Tracking Mechanisms Conserved in Plants(Researches and Overseas Activities)
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 produced by differential growth between the irradiated side and the shaded side. Acco rding to the Cholodny-W ent theory, unilateral light stimulation induces plant hormone auxin gradients 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, t his 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 pin3 pin7 double mutant was successfully produced. A useful information about molecular mechanisms of phototropism will be obtained by a detailed analysis of phototropic responses using the pin mutants.