Involvement of cell surface structures in size-independent grazing resistance of freshwater Actinobacteria.

ABSTRACT: We compared the influences of grazing by the bacterivorous nanoflagellate Poterioochromonas sp. strain DS on ultramicrobacterial Actinobacteria affiliated with the Luna-2 cluster and ultramicrobacterial Betaproteobacteria of the species Polynucleobacter cosmopolitanus. These bacteria were almost identical in size (<0.1 microm(3)) and shape. Predation on a Polynucleobacter strain resulted in a reduction of >86% relative to the initial bacterial cell numbers within 20 days, while in comparable predation experiments with nine actinobacterial strains, no significant decrease of cell numbers by predation was observed over the period of >or=39 days. The differences in predation mortality between the actinobacterial strains and the Polynucleobacter strain clearly demonstrated size-independent gra

SUBMITTER: Tarao M 

PROVIDER: S-EPMC2708440 | biostudies-literature | 2009 Jul

REPOSITORIES: biostudies-literature