ArticleMolecular plant pathology2026
A Hierarchical OhrR-EmrR Regulatory Circuit Fine-Tunes the Vfm Quorum- Sensing System and Virulence in Dickeya oryzae.
Article in Molecular plant pathology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Rice foot rot, caused by Dickeya oryzae, is a destructive bacterial disease. The Vfm quorum-sensing (QS) system is a key virulence regulator of this pathogen. However, the mechanisms by which it perceives and integrates upstream environmental signals for precise transcriptional control are poorly understood. Here, we identify a cascade regulatory network involving the MarR-family transcription factors OhrR and EmrR. Deletion of ohrR in D. oryzae EC1 significantly reduced the Vfm signalling activity, diminished the production of virulence factors including phytotoxin zeamines and plant cell wall-degrading enzymes, and attenuated its pathogenicity. Molecular analyses revealed that OhrR directly bound to the key promoters in the vfm cluster (P
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