Journal
FEMS MICROBIOLOGY LETTERS
Volume 288, Issue 2, Pages 241-246Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1574-6968.2008.01355.x
Keywords
Poterioochromonas sp.; Microcystis aeruginosa; microcystin-LR degradation; ingestion effect; mixotrophy
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Funding
- NSFC-JST [50721140017]
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Algal blooms have become a worldwide issue recently, especially those comprised of toxic cyanobacteria. Grazers' predation of bloom-forming algae plays an important role in water clearing. In this study, a species of golden alga (strain ZX1), capable of feeding on the toxic cyanobacteria Microcystis aeruginosa, was isolated and identified as Poterioochromonas sp. (GenBank accession: EU586184) on the basis of morphological characteristics and 18s rRNA gene sequencing. Feeding experiments showed that ZX1 could clear high densities of M. aeruginosa (7.3 x 10(5)-4.3 x 10(6) cells mL(-1)) in a short time (40 h), with inhibition ratios higher than 99.9%. ZX1 grew during the feeding processes and achieved a maximum density of 10-20% of the initial M. aeruginosa density. Furthermore, this study is the first to report that ZX1 was able to degrade microcystin-LR (MC-LR) in cells of M. aeruginosa while digesting the whole cells, and that the degradation process was determined to be carried out inside the ZX1 cell. For a total MC-LR (intra- and extracellular) concentration of up to 114 mu g L-1, 82.7% was removed in 40 h. This study sheds light on the importance of golden alga in aquatic microbial ecosystems and in the natural transportation/transformation of MC-LR.
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