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Title

Suppression of UV-B stress induced flavonoids by biotic stress: Is there reciprocal crosstalk?

AuthorsSchenke, D.; Utami, H.P.; Zhou, Z.; Gallegos, María Trinidad CSIC ORCID ; Cai, D.
KeywordsBiotic stress
flg22
Crosstalk
Flavonoids
UV-B stress
Issue Date2019
PublisherElsevier
CitationPlant Physiology and Biochemistry 134: 53- 63 (2019)
AbstractPlants respond to abiotic UV-B stress with enhanced expression of genes for flavonoid production, especially the key-enzyme chalcone synthase (CHS). Some flavonoids are antioxidative, antimicrobial and/or UV-B protective secondary metabolites. However, when plants are challenged with concomitant biotic stress (simulated e.g. by the bacterial peptide flg22, which induces MAMP triggered immunity, MTI), the production of flavonoids is strongly suppressed in both Arabidopsis thaliana cell cultures and plants. On the other hand, flg22 induces the production of defense related compounds, such as the phytoalexin scopoletin, as well as lignin, a structural barrier thought to restrict pathogen spread within the host tissue. Since all these metabolites require the precursor phenylalanine for their production, suppression of the flavonoid production appears to allow the plant to focus its secondary metabolism on the production of pathogen defense related compounds during MTI. Interestingly, several flavonoids have been reported to display anti-microbial activities. For example, the plant flavonoid phloretin targets the Pseudomonas syringae virulence factors flagella and type 3 secretion system. That is, suppression of flavonoid synthesis during MTI might have also negative side-effects on the pathogen defense. To clarify this issue, we deployed an Arabidopsis flavonoid mutant and obtained genetic evidence that flavonoids indeed contribute to ward off the virulent bacterial pathogen Pseudomonas syringae pv. tomato (Pst) DC3000. Finally, we show that UV-B attenuates expression of the flg22 receptor FLS2, indicating that there is negative and reciprocal interaction between this abiotic stress and the plant-pathogen defense responses.
Publisher version (URL)10.1016/j.plaphy.2018.06.026
https://www.sciencedirect.com/science/article/abs/pii/S0981942818302778?via%3Dihub
URIhttp://hdl.handle.net/10261/181228
DOIhttp://dx.doi.org/10.1016/j.plaphy.2018.06.026
Identifiersdoi: 10.1016/j.plaphy.2018.06.026
issn: 0981-9428
Appears in Collections:(EEZ) Artículos
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