Abstract：
Phycosphere bacteria can regulate the dynamics of different algal blooms that impact marine ecosystems. Phaeocystis globosa can alternate between solitary free-living cells and colonies and the latter morphotype is dominate during blooms. The mechanisms underlying the formation of these blooms have received much attention. High throughput sequencing results showed that the bacterial community composition differed significantly between colony and solitary strains in bacterial composition and function. It was found that the genera SM1A02 and Haliea were detected only among the colony strains and contribute to ammonium accumulation in colonies, and the genus Sulfitobacter was abundant among the colony strains that were excellent at producing DMS. In addition, the bacterial communities of the two colony strains exhibited stronger abilities for carbon and sulfur metabolism, energy metabolism, vitamin B synthesis, and signal transduction, providing inorganic and organic nutrients and facilitating tight communication with the host algae, thereby promoting growth and bloom development.
摘要：
植物圈细菌可以调节影响海洋生态系统的不同藻华的动态。球形假囊藻可以在孤立的自由活细胞和集落之间交替，后者的形态类型在开花期间占主导地位。这些水华形成的潜在机制受到了很多关注。高通量测序结果表明，菌落和孤立菌株之间的细菌群落组成在细菌组成和功能上存在显着差异。发现SM1A02和Haliea属仅在菌落菌株中检测到，并有助于菌落中的铵积累，在生产DMS的优良菌落菌株中，硫杆菌属丰富。此外,两个菌落菌株的细菌群落表现出较强的碳和硫代谢能力，能量代谢，维生素B合成，和信号转导，提供无机和有机营养，促进与宿主藻类的紧密交流，从而促进生长和开花发展。
