Identification of Rhodococcus fascians cytokinins and their modus operandi to reshape the plant.

Proceedings of the National Academy of Sciences of the United States of America
Ine PertryDanny Vereecke

Abstract

Decades ago, the importance of cytokinins (CKs) during Rhodococcus fascians pathology had been acknowledged, and an isopentenyltransferase gene had been characterized in the fas operon of the linear virulence plasmid, but hitherto, no specific CK(s) could be associated with virulence. We show that the CK receptors AHK3 and AHK4 of Arabidopsis thaliana are essential for symptom development, and that the CK perception machinery is induced upon infection, underlining its central role in the symptomatology. Three classical CKs [isopentenyladenine, trans-zeatin, and cis-zeatin (cZ)] and their 2-methylthio (2MeS)-derivatives were identified by CK profiling of both the pathogenic R. fascians strain D188 and its nonpathogenic derivative D188-5. However, the much higher CK levels in strain D188 suggest that the linear plasmid is responsible for the virulence-associated production. All R. fascians CKs were recognized by AHK3 and AHK4, and, although they individually provoked typical CK responses in several bioassays, the mixture of bacterial CKs exhibited clear synergistic effects. The cis- and 2MeS-derivatives were poor substrates of the apoplastic CK oxidase/dehydrogenase enzymes and the latter were not cytotoxic at high concentrations...Continue Reading

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