Liberibacter americanus

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Candidatus Liberibacter americanus Teixeira et al., 2005 - (American citrus greening)

The pathogen causes citrus greening in South America where it occurs together with Candidatus Liberibacter asiaticus, but is less common. It shares 98.4% similarity in the 16S rRNA gene sequences with the Asian form. The American form could also be detected in the psyllid Diaphorina citri and as the Asian form is likely to be transmitted by this psyllid in a propagative, circulative and persistent manner. The bacterium lives and moves within the sieve tubes of the host plant. The Gram-negative bacterium is nonculturable, not flagellate and belongs to the Rhizobiaceae (α-proteobacteria). In contrast to the Asian form, it is heat sensitive.