In Arabidopsis, root hairs are formed only from a set of epidermal cells named trichoblasts or hair-forming cells. Previous studies showedCAPRICE (CPC) promotes differentiation of hair-forming cells by controlling a negative regulator, GLABRA2 (GL2), which is preferentially expressed in hairless cells. Here, we show that CPC is also predominantly expressed in the hairless cells, but not in the neighboring hair-forming cells, and that CPC protein moves to the hair-forming cells and represses the GL2 expression. We also show that the N terminus of bHLH protein interacts with CPC and is responsible for the GL2expression. We propose a model in which CPC plays a key role in the fate-determination of hair-forming cells.
Keywords:
Arabidiopsis,
CAPRICE,
Myb,
bHLH,
Root hair,
Transcriptional regulation,
Epidermis,
Protein movement
©2002.
2002
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