Presence of previously undescribed bacterial taxa in non-axenic Chlorella cultures

摘要

We determined the bacterial community profile in non-axenic cultures of Chlorella (Chlorophy-ceae, Chlorophyta) isolated from soil. The bacterial composition at the phylum level was differ-ent from that of whole soil bacteria, but it was similar to that reported for non-axenic cultures of marine microalgae such as diatoms (Bacillariophyceae, Heterokontophyta). Expected novel bac-teria, i.e. those which do not have close relatives among described species, were maintained in the cultures, and these bacteria were chiefly composed of members of the phylum Bacteroi-detes. They may have been 'as-yet-uncultured' but in practice unintentionally been cultured in microalgal cultures. They could serve as good bioresources in various fields of biological and ecological studies.