9.トウモロコシ幼葉鞘におけるBFA(Brefeldin A)のPINタンパクの局在とIAAの極性輸送に与える影響(口頭発表)

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Indole-3-acetic acid (IAA) is a plant hormone that plays an important role in many physiological events. Recent studies suggest that such events are accurately controlled through the regulation of IAA transport. To know the IAA function, uncovering the regulation of IAA biosynthesis is the most important issue. We have reported that maize coleoptiles tip is a main site of de novo IAA biosynthesis from tryptophan and produced IAA moves to the lower parts. However, IAA biosynthetic cell(s) in coleoptiles tips and route of IAA transport from the cell(s) are still unknown. Our recent works based on immunolocalization of PIN have revealed IAA transport route(s) in maize coleoptiles. In tip region (0-1mm) of coleoptiles, the putative IAA efflux carrier, PIN, was detected at almost all cells, where it localized in whole plasma membrane. In subapical region, polar staining patterns were observed, and the signals were intensely detected at epidermal and subepidermal cells. When BFA was treated on coleoptile tips, IAA transport was inhibited to about 65% after 40 min and IAA accumulated in the tip region. In addition, internalization of PIN was observed in intra cellar compartment. These data indicated that IAA could be transported in every direction in top 0-1 mm of coleoptiles, and polarly toward lower parts in subapical region mainly through epidermal and subepidermal cells. It was concluded that BFA induces internalization of PIN, which results in inhibition of IAA transport.
植物化学調節学会の論文
2007-10-05

9.トウモロコシ幼葉鞘におけるBFA(Brefeldin A)のPINタンパクの局在とIAAの極性輸送に与える影響(口頭発表)

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