55.ブラシノステロイドが茎の伸長と屈性を制御するメカニズム(口頭発表)

概要

論文の詳細を見る
Gravitropic curvature occurs in stem along the whole elongation zone in various plant species. The mechanism to define the elongation zone and the gravitropic responding zone is unknown. Here, we used Arabidopsis and Mung bean to study mechanisms regulating elongation and the gravitropic response. Brassinosteroid (BR) biosynthesis genes, BR6ox1/CYP85A1 and BR6ox2/CYP85A2 are expressed in elongating zone in Arabidopsis. Mung bean CYP85A is also expressed higher in elongating zone. Analysis of endogenous BRs in Mung bean hypocotyls revealed that level of Castasterone was higher in elongating zone than in non-elongation zone. Brassinolide promoted gravitropic response, whereas Brassinazole inhibited it. These results suggested that BR is a key factor regulating stem elongation and gravitropic response.
植物化学調節学会の論文
2007-10-05