The algicidal activity of marine Loktanella sp. Gb03 on the toxic dinoflagellate Coolia Malayensis

Abstract

Background Toxic dinoflagellate in recent years, have become a significant problem in coastal regions worldwide because of their production of toxin. To manage and control the adverse impact of harmful algal blooms, many strategies including chemical, physical and biological methods have been developed Objective The aim of this study was to determine the algicidal activity of Loktanella sp. Gb03 against toxic dinoflagellate, as well as, the interaction between bacteria and harmful algal blooms. Results The algicidal bacterium, designated as Loktanella sp. Gb03, isolated from dinoflagellate culture (Gb03 sequences were deposited in NCBI GenBank with the accession numbers; Loktanella sp. strain UKMGb03A (KU199217)), was assumed to produce secondary metabolites. When 10% culture filtrate of this strain was applied to C.malayensis cultures, over 99% of C. malayensis cells were destroyed after 24 hours. Gb03 strain showed significant algicidal activities against C.malayensis, and wide algicidal range against various harmful algal bloom (HABs) species. Conclusion: This study is the first study report of the algicidal activity of the Loktanella sp. against toxic dinoflagellate C.malayensis. And also to get more information about bacteria-algal interaction. Taken together, our results suggest that Gb03 could be a candidate for controlling HABs