title: Arabidopsis CAPRICE (MYB) and GLABRA3 (bHLH) control tomato (Solanum lycopersicum) anthocyanin biosynthesis.
abstract: In Arabidopsis thaliana the MYB transcription factor CAPRICE (CPC) and the bHLH transcription factor GLABRA3 (GL3) are central regulators of root-hair differentiation and trichome initiation. By transforming the orthologous tomato genes SlTRY (CPC) and SlGL3 (GL3) into Arabidopsis, we demonstrated that these genes influence epidermal cell differentiation in Arabidopsis, suggesting that tomato and Arabidopsis partially use similar transcription factors for epidermal cell differentiation. CPC and GL3 are also known to be involved in anthocyanin biosynthesis. After transformation into tomato, 35S::CPC inhibited anthocyanin accumulation, whereas GL3::GL3 enhanced anthocyanin accumulation. Real-time reverse transcription PCR analyses showed that the expression of anthocyanin biosynthetic genes including Phe-ammonia lyase (PAL), the flavonoid pathway genes chalcone synthase (CHS), dihydroflavonol reductase (DFR), and anthocyanidin synthase (ANS) were repressed in 35S::CPC tomato. In contrast, the expression levels of PAL, CHS, DFR, and ANS were significantly higher in GL3::GL3 tomato compared with control plants. These results suggest that CPC and GL3 also influence anthocyanin pigment synthesis in tomato.
authors.affiliation: Graduate School of Biosphere Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan.
authors.forename: Takuji
authors.initials: T
authors.lastname: Wada
authors.affiliation: Faculty of Applied Biological Science, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan.
authors.forename: Asuka
authors.initials: A
authors.lastname: Kunihiro
authors.affiliation: Graduate School of Biosphere Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima, Japan.
authors.forename: Rumi
authors.initials: R
authors.lastname: Tominaga-Wada
mesh_terms: D000217:Acyltransferases / Q000235:genetics / Q000378:metabolism; D000429:Alcohol Oxidoreductases / Q000235:genetics / Q000378:metabolism; D000872:Anthocyanins / Q000096:biosynthesis*; D017360:Arabidopsis / Q000235:genetics* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics* / Q000378:metabolism; D002454:Cell Differentiation; D018506:Gene Expression Regulation, Plant; D018551:Solanum lycopersicum / Q000235:genetics* / Q000378:metabolism; D010105:Oxygenases / Q000235:genetics / Q000378:metabolism; D010650:Phenylalanine Ammonia-Lyase / Q000235:genetics / Q000378:metabolism; D019441:Plant Epidermis / Q000166:cytology / Q000378:metabolism; D030821:Plants, Genetically Modified; D020598:Proto-Oncogene Proteins c-myb / Q000235:genetics* / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D019076:Transgenes
chemical_list: D000217:Acyltransferases; D000429:Alcohol Oxidoreductases; D000872:Anthocyanins; D029681:Arabidopsis Proteins; D051792:Basic Helix-Loop-Helix Proteins; D010105:Oxygenases; D010650:Phenylalanine Ammonia-Lyase; D020598:Proto-Oncogene Proteins c-myb; C511989:CPC protein, Arabidopsis; C417284:GL3 protein, Arabidopsis; C056570:dihydroflavanol 4-reductase; C118159:anthocyanidin synthase; C491135:AT5G13930 protein, Arabidopsis