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General Session 4: Marine environment, ecosystem & sustainability |
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Community structure and metabolic activities of bacterioplankton during the blooming period of Prorocentrum donghaiense in the coastal East China Sea
GS4-19-S
Dongxu Li* , State Key Laboratory of Marine Environmental Science/College of the Environment and Ecology, Xiamen University, Xiamen, China
Hao Zhang, State Key Laboratory of Marine Environmental Science/College of the Environment and Ecology, Xiamen University, Xiamen, China
Xiaohuang Chen, State Key Laboratory of Marine Environmental Science/College of the Environment and Ecology, Xiamen University, Xiamen, China
Zhangxian Xie, State Key Laboratory of Marine Environmental Science/College of the Environment and Ecology, Xiamen University, Xiamen, China
Yongzhang, State Key Laboratory of Marine Environmental Science/College of the Environment and Ecology, Xiamen University, Xiamen, China
ShufZhang, State Key Laboratory of Marine Environmental Science/College of the Environment and Ecology, Xiamen University, Xiamen, China
Lin Lin, State Key Laboratory of Marine Environmental Science/College of the Environment and Ecology, Xiamen University, Xiamen, China
Dazhi Wang, State Key Laboratory of Marine Environmental Science/College of the Environment and Ecology, Xiamen University, Xiamen, China
Presenter Email: lidongxu1991@126.com
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| Dinoflagellates are important primary productivity producers and major makers of harmful algal bloom. Little is known about bacterioplankton metabolic activities during dinoflagellate blooms. Here, a 16S rRNA gene sequencing and metaproteomic survey were proceeded to reveal community structure and metabolic activities of bacterioplankton at different P. donghaiense blooming phases collected in coastal East China Sea. We found that Beta-glucosidase from Pseudoalteromonadaceae characterized with algicidal effect may utilize the organic nutrients from dissolved P. donghaiense cells to sustain its growth, thus algicidal species terminate the bloom with the higher expression of lytic proteins at late-blooming phase. Fibrobacteres-Chlorobi-Bacteroidetes (FCB) group, SAR11 clade, SAR86 clade and Rhodobacteraceae contribute largely to bacterioplanktonic community in middle-blooming phase whereas Pseudoalteromonadaceae dominate the bacterioplanktonic community in late-blooming phase. Some transporters, like TonB-dependent receptors (TBDRs), were highly expressed at both blooming phases. Biological process of carbon metabolism, energy metabolism and stress were higher expressed at middle-blooming phase while higher expressions of proteolysis and central carbon metabolism were observed at late-blooming phase. Active remineralization of substrate by bacterioplankton at middle-blooming phase further promoted the growth of phytoplankton. Our results implicate that during a dinoflagellate bloom some specific algicidal bacterioplankton may proliferate quickly and regulate the blooming process. |
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