Studies on the mechanism of ion distribution and re-translocation in plant tissues.

在植物细胞和组织中研究了低分子物质的动态平衡的分子机制。我们利用拟南芥植物和细胞，或杨树，重点研究了磷酸盐的动态平衡。首先，我们阐明了根构型与环境磷状况之间的关系。我们发现磷和铁的协同作用是相当重要的。其次，我们从基因表达的角度分析了拟南芥老叶到幼叶的磷酸盐再运输系统。此外，我们还观察了夏末和秋季杨树叶片中磷的恢复情况。最后，我们分析了种子发育过程中肌醇磷酸盐的细胞和组织代谢。

Molecular mechanisms of homeostasis of low molecular weight substances were studied in plant cells and tissues. We have focused on the phosphate homeostasis using Arabidopsis plants and cells, or Poplar tree. First we clarified a relationship between root architecture and environmental phosphate status. We found cooperative roles of phosphate and iron are quite important. Second, we analyzed the re-translocation system of phosphate from older leaves to younger leaves of Arabidopsis based on the gene expression. Further, we observed phosphate recovery of poplar leaves during late summer and autumn. Last, we analyzed cell and tissue metabolism of inositol phosphates during seed development.