title: Peach MYB7 activates transcription of the proanthocyanidin pathway gene encoding leucoanthocyanidin reductase, but not anthocyanidin reductase.
abstract: Proanthocyanidins (PAs) are a group of natural phenolic compounds that have a great effect on both flavor and nutritious value of fruit. It has been shown that PA synthesis is regulated by R2R3-MYB transcription factors (TFs) via activation of PA-specific pathway genes encoding leucoanthocyanidin reductase and anthocyanidin reductase. Here, we report the isolation and characterization of a MYB gene designated PpMYB7 in peach. The peach PpMYB7 represents a new group of R2R3-MYB genes regulating PA synthesis in plants. It is able to activate transcription of PpLAR1 but not PpANR, and has a broader selection of potential bHLH partners compared with PpMYBPA1. Transcription of PpMYB7 can be activated by the peach basic leucine-zipper 5 TF (PpbZIP5) via response to ABA. Our study suggests a transcriptional network regulating PA synthesis in peach, with the results aiding the understanding of the functional divergence between R2R3-MYB TFs in plants.
authors.affiliation: Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden of the Chinese Academy of Sciences Wuhan, China ; Graduate University of Chinese Academy of Sciences Beijing, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhou
authors.affiliation: The New Zealand Institute for Plant & Food Research Ltd., Mt Albert Research Centre Auckland, New Zealand.
authors.forename: Kui
authors.initials: K
authors.lastname: Lin-Wang
authors.affiliation: Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden of the Chinese Academy of Sciences Wuhan, China.
authors.forename: Liao
authors.initials: L
authors.lastname: Liao
authors.affiliation: Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden of the Chinese Academy of Sciences Wuhan, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Gu
authors.affiliation: Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden of the Chinese Academy of Sciences Wuhan, China.
authors.forename: Ziqi
authors.initials: Z
authors.lastname: Lu
authors.affiliation: The New Zealand Institute for Plant & Food Research Ltd., Mt Albert Research Centre Auckland, New Zealand ; School of Biological Sciences, University of Auckland Auckland, New Zealand.
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Allan
authors.affiliation: Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden of the Chinese Academy of Sciences Wuhan, China.
authors.forename: Yuepeng
authors.initials: Y
authors.lastname: Han
keywords: PpMYB7; anthocyanidin reductase; leucoanthocyanidin reductase; peach; proanthocyanidins