Rhizogenic strains comprise biotrophic pathogens that cause hairy root disease (HRD) on hydroponically grown and crops, besides being widely explored agents for the creation of hairy root cultures for the sustainable production of plant-specialized metabolites. Hairy root formation is mediated through the expression of genes encoded on the T-DNA of the root-inducing (Ri) plasmid, of which several, including (), play a major role in hairy root development. Despite decades of research, the exact molecular function of the proteins encoded by the genes remains enigmatic.
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