Figure 6. XccBphP functions as a negative regulator for virulence through transcriptional regulation.

1. Scheme derived from the results obtained throughout this work from the wild‐type, the XccbphP (null mutant), and the complemented pXccBphP (overexpressing) strains. Systems affected are indicated in different colors, and gene candidates involved in these systems found by RNA‐Seq analysis that are regulated by XccBphP are depicted in the same color code.
2. Possible model for XccBphP light‐regulated EPS and biofilm results integrated with the spectroscopic data. XccBphP downregulates biofilm formation, xanthan production, and consequently Xcc virulence in a Pr:Pfr‐dependent manner. XccBphP exposed to sunlight filtered by a canopy (left), direct sunlight (middle), or darkness (right).