Verdan Mariana, Resende Eduardo, Cypriano Jefferson, Werneck Clarissa, Lins Ulysses, Abreu Fernanda
Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21941-902, Brazil.
Int Microbiol. 2022 May;25(2):309-323. doi: 10.1007/s10123-021-00218-5. Epub 2021 Nov 4.
Magnetotactic bacteria (MTB) response to the magnetic field can be classified into north-seeking (NS) and south-seeking (SS), which usually depends on their inhabiting site in the North and South Hemisphere, respectively. However, uncommon inverted polarity was observed on both hemispheres. Here, we studied magnetotactic multicellular prokaryotes (MMPs) from a coastal lagoon in Brazil collected in April and August 2014. MMPs from the first sampling period presented both magnetotactic behaviors, while MMPs collected in August/2014 were only SS. Phylogenetic analysis based on the 16S rRNA coding gene showed that these organisms belong to the Deltaproteobacteria class. The 16S rRNA gene sequences varied among MMPs regardless of the sampling period, and similarity values were not related to the type of magnetotactic response presented by the microorganisms. Therefore, differences in the magnetotactic behavior might result from the physiological state of MMPs, the availability of resources, or the instability of the chemical gradient in the environment. This is the first report of NS magnetotactic behavior on MMPs from the South Hemisphere.
趋磁细菌（MTB）对磁场的反应可分为向北（NS）和向南（SS），这通常分别取决于它们在北半球和南半球的栖息地。然而，在两个半球都观察到了罕见的反极性现象。在这里，我们研究了2014年4月和8月从巴西一个沿海泻湖采集的趋磁多细胞原核生物（MMPs）。第一个采样期的MMPs呈现出两种趋磁行为，而2014年8月采集的MMPs仅为向南趋磁。基于16S rRNA编码基因的系统发育分析表明，这些生物属于δ-变形菌纲。无论采样期如何，MMPs之间的16S rRNA基因序列都有所不同，相似性值与微生物呈现的趋磁反应类型无关。因此，趋磁行为的差异可能是由于MMPs的生理状态、资源可用性或环境中化学梯度的不稳定性造成的。这是南半球MMPs向北趋磁行为的首次报道。
