Kim Yihwan, Jeon Jehyun, Kwak Min Seok, Kim Gwang Hoon, Koh InSong, Rho Mina
Department of Computer Science and Engineering, Hanyang University, Seoul, Korea.
Department of Biology, Kongju National University, Kongju, Korea.
PLoS One. 2018 Jan 2;13(1):e0190266. doi: 10.1371/journal.pone.0190266. eCollection 2018.
Synechococcus is an important photosynthetic picoplankton in the temperate to tropical oceans. As a photosynthetic bacterium, Synechococcus has an efficient mechanism to adapt to the changes in salinity and light intensity. The analysis of the distributions and functions of such microorganisms in the ever changing river mouth environment, where freshwater and seawater mix, should help better understand their roles in the ecosystem. Toward this objective, we have collected and sequenced the ocean microbiome in the river mouth of Kwangyang Bay, Korea, as a function of salinity and temperature. In conjunction with comparative genomics approaches using the sequenced genomes of a wide phylogeny of Synechococcus, the ocean microbiome was analyzed in terms of their composition and clade-specific functions. The results showed significant differences in the compositions of Synechococcus sampled in different seasons. The photosynthetic functions in such enhanced Synechococcus strains were also observed in the microbiomes in summer, which is significantly different from those in other seasons.
聚球藻属是温带至热带海洋中重要的光合浮游微生物。作为一种光合细菌，聚球藻属拥有一种高效的机制来适应盐度和光照强度的变化。分析此类微生物在淡水与海水混合的不断变化的河口环境中的分布和功能，应有助于更好地理解它们在生态系统中的作用。为实现这一目标，我们收集了韩国光阳湾河口的海洋微生物群落，并根据盐度和温度对其进行了测序。结合使用广泛系统发育的聚球藻属测序基因组的比较基因组学方法，对海洋微生物群落的组成和特定进化枝功能进行了分析。结果表明，不同季节采集的聚球藻属组成存在显著差异。在夏季的微生物群落中也观察到此类增强型聚球藻属菌株的光合功能，这与其他季节的光合功能显著不同。
