様式C-19 科学研究費助成事業(科学研究費補助金)研究成果報告書研究成果の概要(英文) :Root cap has several important functions, such as protection of root meristem from surrounding environment and the gravity sensing.We had identified the Arabidopsis NAC transcription factor, SOMBRERO (SMB), as a key regulator of root cap differentiation and maturation.Microarray analysis identified, more than 20 genes that act downstream of SMB in the root cap.These genes included two other NAC transcription