First Evidence of Altererythrobacter sp. LY02 with Indirect Algicidal Activity on the Toxic Dinoflagellate, Alexandrium tamarense
Alexandrium tamarense is a toxic harmful algal blooms (HABs) causing species, which poses great threat to human health and marine economy. In this study, we isolated an algicidal bacterium Altererythrobacter sp. LY02 towards to A. tamarense and later investigated the algicidal activity, algicidal mode, characteristics of algicidal active substance and algicidal procedure. The results indicated that the cell-free filtrate of strain LY02 showed high algicidal effect on algal growth, however, bacterial cells almost lost algicidal activity. The algicidal active substance was temperature- and pH-stability, and its molecular weight was less than 1000 Da, and was a non-proteinaceous material or non-polysaccharide, mid-polar substance. Under the algicidal effect of active substance, the morphology and structure of A. tamarense cells were seriously damaged as well as organelles. Our study confirmed that the algicidal active substance could be used as an excellent bio-agent for controlling HABs caused by A. tamarense.
KeywordsAlgal Cell Algal Culture Harmful Algal Bloom Algicidal Activity Toxic Dinoflagellate
This work was supported by the NSFC (41576109, 31500095), Joint project of National Natural Science Foundation of China and Shandong province: Marine ecology and environmental sciences (U1406403), the Doctoral Scientific Research Start-up Foundation of Henan Normal University (5101049170160) and MEL Visiting Fellowship (MELRS1512). We also thank Prof. I. J. Hodgkiss of The University of Hong Kong for comments and help with the English.
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Conflict of Interest
We confirm that the manuscript has been read and approved by all named authors and that there are no other persons who satisfied the criteria for authorship but are not listed. We further confirm that the order of authors listed in the manuscript has been approved by all of us. There are no conflicts of interest associated with this publication.
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