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An R2R3-MYB Transcription Factor Regulates Eugenol Production in Ripe Strawberry Fruit Receptacles
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An R2R3-MYB Transcription Factor Regulates Eugenol Production in Ripe Strawberry Fruit Receptacles
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Journal Article
An R2R3-MYB Transcription Factor Regulates Eugenol Production in Ripe Strawberry Fruit Receptacles
2015
Overview
Eugenol is a volatile phenylpropanoid that contributes to flower and ripe fruit scent. In ripe strawberry (Fragaria × ananassa) fruit receptacles, eugenol is biosynthesized by eugenol synthase (FaEGS2). However, the transcriptional regulation of this process is still unknown. We have identified and functionally characterized an R2R3 MYB transcription factor (EMISSION OF BENZENOID II [FaEOBII]) that seems to be the orthologous gene ofPhEOBIIfromPetunia hybrida, which contributes to the regulation of eugenol biosynthesis in petals. The expression ofFaEOBIIwas ripening related and fruit receptacle specific, although high expression values were also found in petals. This expression pattern ofFaEOBIIcorrelated with eugenol content in both fruit receptacle and petals. The expression ofFaEOBIIwas repressed by auxins and activated by abscisic acid, in parallel to the ripening process. In ripe strawberry receptacles, where the expression ofFaEOBIIwas silenced, the expression ofCINNAMYL ALCOHOL DEHYDROGENASE1andFaEGS2, two structural genes involved in eugenol production, was down-regulated. A subsequent decrease in eugenol content in ripe receptacles was also observed, confirming the involvement ofFaEOBIIin eugenol metabolism. Additionally, the expression ofFaEOBIIwas under the control ofFaMYB10, another R2R3 MYB transcription factor that regulates the early and late biosynthetic genes from the flavonoid/phenylpropanoid pathway. In parallel, the amount of eugenol inFaMYB10-silenced receptacles was also diminished. Taken together, these data indicate thatFaEOBIIplays a regulating role in the volatile phenylpropanoid pathway gene expression that gives rise to eugenol production in ripe strawberry receptacles.
Publisher
American Society of Plant Biologists
Subject
/ Biology
/ Enzymes
/ eugenol
/ Fruits
/ Gas Chromatography-Mass Spectrometry
/ Gene Expression Regulation, Plant - drug effects
/ Gene Silencing - drug effects
/ Genes
/ GENES, DEVELOPMENT, AND EVOLUTION
/ Oligonucleotide Array Sequence Analysis
/ Plant Growth Regulators - pharmacology
/ Plants
/ Promoter Regions, Genetic - genetics
/ Protein Binding - drug effects
/ Real-Time Polymerase Chain Reaction
/ Ripening
/ Transcription Factors - metabolism
