期刊
PLANT PHYSIOLOGY
卷 157, 期 3, 页码 1196-1208出版社
AMER SOC PLANT BIOLOGISTS
DOI: 10.1104/pp.111.185785
关键词
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资金
- National Research Foundation of Korea
- Korean government [2010-0012685, 013-2009-1-C00047, 2010-0016509]
- Rural Development Administration, Republic of Korea [PJ008207]
- U.S. National Science Foundation [IOS-0744599]
- National Research Foundation of Korea [2010-0012685, 013-2009-1-C00047] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The root hair and nonhair cells in the Arabidopsis (Arabidopsis thaliana) root epidermis are specified by a suite of transcriptional regulators. Two of these are WEREWOLF (WER) and CAPRICE (CPC), which encode MYB transcription factors that are required for promoting the nonhair cell fate and the hair cell fate, respectively. However, the precise function and relationship between these transcriptional regulators have not been fully defined experimentally. Here, we examine these issues by misexpressing the WER gene using the GAL4-upstream activation sequence transactivation system. We find that WER overexpression in the Arabidopsis root tip is sufficient to cause epidermal cells to adopt the nonhair cell fate through direct induction of GLABRA2 (GL2) gene expression. We also show that GLABRA3 (GL3) and ENHANCER OF GLABRA3 (EGL3), two closely related bHLH proteins, are required for the action of the overexpressed WER and that WER interacts with these bHLHs in plant cells. Furthermore, we find that CPC suppresses the WER overexpression phenotype quantitatively. These results show that WER acts together with GL3/EGL3 to induce GL2 expression and that WER and CPC compete with one another to define cell fates in the Arabidopsis root epidermis.
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