Abstract
In Arabidopsis roots, vascular bundles are arranged with a bilateral symmetry. Recent analyses of the mutant of LONESOME HIGHWAY (LHW) have suggested that LHW is a key factor for establishing the bilateral symmetry. In the lhw mutant, only single xylem and phloem poles are formed, and the number of cells in the stele of the root reduces. LHW encodes a transcription factor, which contains bHLH-domain. There are three paralogs of LHW in the Arabidopsis genome. However, all of them are still unknown about function and expression. To get a hint of functions of these genes, we first investigated expression patterns of them. For this purpose, we made transgenic plants harboring promoter-GUS and promoter-YFP-NLS of each paralog gene. Next we observed the phenotype of a knockout line of a paralog gene. Based on these analyses, we will discuss function of the LHW paralog genes.
