Graduate School of Biosphere Sciences, Hiroshima University Higashi-Hiroshima, Japan.
Front Plant Sci. 2014 Mar 13;5:91. doi: 10.3389/fpls.2014.00091. eCollection 2014.
CAPRICE (CPC) encodes a small protein with an R3 MYB motif and regulates root hair and trichome cell differentiation in Arabidopsis thaliana. 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 Arabidopsis. 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 SlTRY gene as an ortholog of the Arabidopsis TRY gene. Transgenic Arabidopsis plants harboring SlTRY produced more root hairs, a phenotype similar to that of 35S::CPC transgenic plants. CPC is also known to be involved in anthocyanin biosynthesis. Anthocyanin accumulation was repressed in the SlTRY transgenic plants, suggesting that SlTRY can also influence anthocyanin biosynthesis. We concluded that tomato and Arabidopsis 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.
CAPRICE（CPC）编码一种具有 R3 MYB 基序的小蛋白，调节拟南芥根毛和表皮毛细胞的分化。其他六个 CPC 样 MYB 蛋白，包括 TRIPTYCHON（TRY）、TRY 和 CPC1 的增强子（ETC1）、TRY 和 CPC2 的增强子（ETC2）、TRY 和 CPC3/CPC 样 MYB3（ETC3/CPL3）的增强子、TRICHOMELESS1（TCL1）和 TRICHOMELESS2/CPC 样 MYB4（TCL2/CPL4），也具有调节拟南芥根毛和/或表皮毛细胞分化的能力。在这篇综述中，我们描述了我们关于 CPC 样 MYB 转录因子如何调节根毛细胞分化的最新发现。最近，我们鉴定了番茄 SlTRY 基因是拟南芥 TRY 基因的同源基因。含有 SlTRY 的转基因拟南芥植株产生了更多的根毛，这一表型与 35S::CPC 转基因植株相似。CPC 也已知参与花色素苷生物合成。SlTRY 转基因植株中的花色素苷积累受到抑制，表明 SlTRY 也可以影响花色素苷的生物合成。我们得出结论，番茄和拟南芥部分使用类似的转录因子进行根毛细胞分化，而 CPC 样 R3 MYB 可能是植物根毛发育的关键共同调节因子。
