2. トウモロコシ幼葉鞘における重力刺激によるIAAの移動

概要

論文の詳細を見る
The plant hormone auxin (indole-3-acetic acid (IAA)) plays important roles for response to external factors such as light and gravity. We reported that IAA was biosynthesized mainly at 0-2mm tip region and that the synthesized IAA was continuously transported to basal part in maize coleoptiles. It has been well investigated that IAA distribution rapidly changes at upper and lower side of the coleoptile within 20 minutes after gravi-stimulation. Here, we examined not only free IAA level in the tissues but also diffusible IAA level from upper or lower tip region after gravi-stimulation. The results revealed that flow direction mainly changed at 0-3mm tip region, not at 4-8mm region, indicating that apical zone was a main site for gravi-response, where IAA was transported to lower parts causing asymmetric IAA distribution throughout the coleoptile.
植物化学調節学会の論文
2005-10-13