Community composition and functional characteristics of symbiotic bacteria of Synechococcus
Synechococcus and its phycosphere bacteria can achieve mutualism through functional complementarity.In this study,the functional characteristics and ecological effects of stable symbiotic dominant bacteria were investi-gated by analyzing the differences of community structure and physiological indices of the algal-bacteria system be-fore and after bacteria removal of in situ Synechococcus enrichment culture system.The results showed that Synecho-coccus mainly belonged to S5.1_Ⅷ subgroup,and that the dominant classes of symbiotic bacteria were α-Pro-teobacteria,γ-Proteobacteria,and Bacteroides.After bacteria removal,community structure of recombinant stable symbiotic bacteria tended to be consistent,with Ruegeria and Marianobacter as the dominant populations.The re-sults of function annotation showed that the relative abundance of bacterial groups involved in carbon and nitrogen cycling was 88.47％and 11.08％,respectively.Affected by symbiotic dominant bacterial community,phycobilipro-tein contents and maximum photosynthetic capacity of Synechococcus significantly changed,and light conversion efficiency increased.Furthermore,Synechococcus released large amounts of silicon during cultivation,which may provide ballasting mineral for the aggregation and sinking of pico-phytoplankton and promote marine carbon cycling.
picocyanobacteriaphycospherebacteria-algae interactionpopulation diversityecosystem function
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