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Virulent Rhodococcus fascians Produce Unique Methylated Cytokinins

School of Biological Sciences, University of Canterbury, Christchurch 8140, New Zealand
Plants 2019, 8(12), 582; https://doi.org/10.3390/plants8120582
Received: 26 November 2019 / Revised: 5 December 2019 / Accepted: 5 December 2019 / Published: 7 December 2019
Some strains of Rhodococcus fascians exist only as epiphytes on the plant surface whereas others can become endophytic and cause various abnormalities including the release of multiple buds and reduced root growth. The abnormalities reflect the action of cytokinin. The strains that can become endophytic harbour a linear plasmid that carries cytokinin biosynthesis, activation and destruction genes. However, both epiphytic and endophytic forms can release cytokinin into culture, affect cytokinin metabolism within inoculated plants and enhance the expression of sugar and amino acid transporters and cell wall invertases, but only the endophytic form markedly affects the morphology of the plant. A unique methylated cytokinin, dimethylated N6-(∆2-isopentenyl)adenine (2-MeiP), operating in a high sugar environment, is the likely causative factor of the severe morphological abnormalities observed when plants are inoculated with R. fascians strains carrying the linear plasmid. View Full-Text
Keywords: apical dominance; cytokinin; methylated cytokinin; Rhodococcus fascians; sugar will eventually be exported transporter; SWEET; amino acid transporter; sugar transporter; cell wall invertase apical dominance; cytokinin; methylated cytokinin; Rhodococcus fascians; sugar will eventually be exported transporter; SWEET; amino acid transporter; sugar transporter; cell wall invertase
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Jameson, P.E. Virulent Rhodococcus fascians Produce Unique Methylated Cytokinins. Plants 2019, 8, 582.

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