オーキシンによる植物の重力形態形成の制御機構に関する研究(学会賞)
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When cucumber seeds are placed in a horizontal position for germination, the resulting seedlings develop a protuberance called peg on the lower side of the transition zone between hypocotyl and root. Peg formation is suppressed on the upper side of the gravistimulated transition zone. We have shown that auxin plays an essential role in the lateral placement of a peg. That is, auxin level was significantly reduced in the upper side of the gravistimulated transition zone, and application of exogenous auxin caused a peg formation on both sides. On the other hand, treatment of seedlings with inhibitors of auxin efflux resulted in development of a peg on both upper and lower sides of the transition zone. Thus, active efflux of auxin might occur on the upper side of the gravistimulated transition zone for reducing auxin level and thereby suppressing peg formation. To develop a model for testing this hypothesis, we isolated cDNAs encoding auxin efflux carriers from cucumber and analyzed their expressions. Also, we examined a possible involvement of differential regulation of auxin-mediated transcription in peg formation. In addition, we have investigated other gravity-dependent phenomena: hydrotropism and its interference by gravitropism in roots, and gravity-dependency of circumnutation and lateral bud outgrowth. These experimental systems provide us with clues to understand the regulatory mechanisms of plant gravimorphogenesis by auxin.
- 植物化学調節学会の論文
- 2008-10-06
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