3.正常な黄化エンドウ芽生えの形態形成は正常なオーキシン極性移動を必要とする(口頭発表)

概要

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Epicotyls of etiolated pea (Pisum sativum L. cv. Alaska) seedlings grow toward the vertical direction on earth. On the other hand, those of agravitropic mutant, ageotropum, and Alaska treated with auxin polar transport inhibitors of TIB A (2,3,5-triiodobenzoic acid), HFCA (9-hydroxyfluorene-9-carboxylic acid) and NPA (N-(1-naphtyl)phthalamic acid) showed automorphosis-like growth and development. These results strongly suggest close relationships between growth and development, and auxin polar transport in etiolated pea seedlings. Activities of auxin polar transport were asymmetrical in epicotyls, being extremely higher in the proximal side of epicotyls than in the distal one in etiolated Alaska and ageotropum pea seedlings. These results in etiolated Alaska pea epicotyls were true in expression of PsPIN1 encoding a facilitator protein of auxin polar transport and of an auxin-inducible gene, PsIAA4/5. Activities of auxin polar transport in ageotropum and Alaska pea epicotyls treated with auxin polar transport inhibitors were significantly reduced. These results strongly support the idea that normal activities of auxin polar transport is essentially required for normal growth and development in early growth stage of etiolated pea seedlings.
植物化学調節学会の論文
2007-10-05