AUTHOR=Tominaga-Wada Rumi , Wada Takuji 

TITLE=Regulation of root hair cell differentiation by R3 MYB transcription factors in tomato and Arabidopsis

JOURNAL=Frontiers in Plant Science

VOLUME=5

YEAR=2014

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2014.00091

DOI=10.3389/fpls.2014.00091

ISSN=1664-462X

ABSTRACT=<p><italic>CAPRICE</italic> (<italic>CPC</italic>) encodes a small protein with an R3 MYB motif and regulates root hair and trichome cell differentiation in <italic>Arabidopsis thaliana.</italic> Six additional CPC-like MYB proteins including TRIPTYCHON (TRY), ENHANCER OF TRY AND CPC1 (ETC1), ENHANCER OF TRY AND CPC2 (ETC2), ENHANCER OF TRY AND CPC3/CPC-LIKE MYB3 (ETC3/CPL3), TRICHOMELESS1 (TCL1), and TRICHOMELESS2/CPC-LIKE MYB4 (TCL2/CPL4) also have the ability to regulate root hair and/or trichome cell differentiation in <italic>Arabidopsis</italic>. In this review, we describe our latest findings on how CPC-like MYB transcription factors regulate root hair cell differentiation. Recently, we identified the tomato <italic>SlTRY</italic> gene as an ortholog of the <italic>Arabidopsis</italic><italic>TRY</italic> gene. Transgenic <italic>Arabidopsis</italic> plants harboring <italic>SlTRY</italic> produced more root hairs, a phenotype similar to that of <italic>35S</italic>::<italic>CPC</italic> transgenic plants. CPC is also known to be involved in anthocyanin biosynthesis. Anthocyanin accumulation was repressed in the <italic>SlTRY</italic> transgenic plants, suggesting that <italic>SlTRY</italic> can also influence anthocyanin biosynthesis. We concluded that tomato and <italic>Arabidopsis</italic> partially use similar transcription factors for root hair cell differentiation, and that a CPC-like R3 MYB may be a key common regulator of plant root-hair development.</p>