抄録
Tissue reunion is known to be a natural phenomenon in plant which occurs during wounding or grafting. In order to understand the tissue reunion process in molecular level, morphological and gene expression analyses were performed using the Arabidopsis cut flowering stem. In wild type plant, the cell division in tissue reunion process has been found to start in 3 days after cutting and almost complete in 14 days after cutting. Microarray analysis showed up-regulation of the genes for cell division etc. in cut and flowering stems during tissue reunion process. In this study, we focused on the genes encoding transcription factors and cell wall modification enzymes. The gene expression analysis revealed that xyloglucan endotransglucosylase/hydrolase (XTH) and NAC-type transcription factor (NAC) were up-regulated at 1 and 3 days after cutting. Moreover decapitation and/or auxin application showed that NAC and XTH are inducible by auxin. We also found that in NAC:SRDX, the expression level of XTH decreased in comparison with wild type plant. These results suggest that the involvement of XTH under the control of NAC transcription factor
