[No authors listed]
Earlier studies have shown that the Lc gene of maize, a member of the R gene family that encode basic-helix-loop-helix (bHLH) transcription factors, is involved with anthocyanin production and trichome formation in Arabidopsis. We previously reported that the N-terminus of R protein interacts with CAPRICE (CPC), a regulatory protein, in triggering epidermal hair differentiation in Arabidopsis. In this study, we investigated the roles of full-length R, the N-terminal region of R (RN) and the C-terminal region of R (RC) in epidermal cell differentiation and anthocyanin production. We found that the N-terminal region was responsible for leaf trichome and root hair differentiation, whereas full-length R was required for anthocyanin upregulation. Yeast two-hybrid analysis showed that the C-terminal region was the binding site for the formation of homo- or hetero-dimers of the R-like bHLH transcription factor. To stimulate anthocyanin production, full-length R is required.
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