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Browsing by Subject "Rubus stunt"

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    Genome comparison of ‘Candidatus Phytoplasma rubi’ with genomes of other 16SrV phytoplasmas highlights special group features
    (2023) Böhm, Jan Werner; Duckeck, Dominik; Duduk, Bojan; Schneider, Bernd; Kube, Michael
    Phytoplasmas are associated with important bacterial diseases, causing severe symptoms in agricultural and ornamental crops. ‘Candidatus Phytoplasma rubi’, associated with the Rubus stunt in raspberries (Rubus idaeus) and blackberries (Rubus subgenus Rubus), causes shortened internodes, elongated sepals, proliferation, phyllody, and virescence. The recently published genome of ‘Ca. P. rubi’ RS enabled a comprehensive genomic comparison to the complete genomes of 16SrV phytoplasmas, comprising strains of the flavescence dorée-associated phytoplasma CH and two ‘Candidatus Phytoplasma ziziphi’ strains. Besides the typical transporters and metabolic features of phytoplasmas, the phosphorolysis of sucrose and the utilization of the carboxylic acid L-lactate became apparent for the 16SrV-group. With respect to the effector repertoire and the encoded immunodominant membrane proteins involved in host colonization, the group revealed conserved features that comprise the variable membrane proteins A and B. However, SAP11- and SAP54 orthologs were limited to ‘Ca. P. rubi’ RS and ‘Ca. P. ziziphi’. Genome-sequence-based phylogenetic analysis supports the close relationship of these genomes relative to alder yellows phytoplasmas. The analyses supported the impact of the mobilome on phytoplasma evolution but also highlighted that there is the possibility of identifying phytoplasmas with a larger metabolic repertoire in the future.