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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Siderophore production by bacteria isolated from mangrove sediments: A microcosm study
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Siderophore production by bacteria isolated from mangrove sediments: A microcosm study

机译：从红树林沉积物中分离出的细菌产生铁载体：微观研究

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Mangroves are one of the most productive ecosystems worldwide covering up to 75% of the coastline in the tropics and subtropics. They support a highly diverse community (marine and terrestrial) and serves as reservoirs of nutrients for coastal and shelf waters. Bacterial diversity in mangroves includes heterotrophs, autotrophs (nitrogen fixation) and pathogens (phytopathogens, marine, and human). All these bacterial groups require sequestration of bioavailable iron, which is largely done by the production of siderophores. In this study, microcosm experiments were conducted to test the effect of incubation conditions (temperature, iron concentration, pH, and carbon source) on growth and siderophore production in four mangrove sediment bacterial isolates-Escherichia vulneris, Enterobacter cancerogenus, Pantoea agglomerans, and Enterobacter bugandensis. Our study showed that all isolates produce more siderophores (30 to 60%) at low iron concentrations (10 nM to 1 mu M) during lag-phase and early log-phase of growth. Low temperature suppressed bacterial growth without significantly altering the siderophore production, whereas low pH suppressed both growth and siderophore production in these isolates. Although all isolates could produce siderophores when using different carbon sources, glucose served as an ideal carbon source. The observed changes in growth and siderophore production may be attributed to species-specific physiological traits, changes in bioavailability of iron and/or combination of both. Our results suggest that in a changing global environment, warming of the surrounding waters may not reduce the siderophore production and hence, they will be essential in sustaining bacterial activity in sediments.
机译：红树林是世界上生产力最高的生态系统之一，覆盖热带和亚热带地区多达75％的海岸线。它们支持高度多样化的社区（海洋和陆地），并为沿海和陆架水提供了养分。红树林中的细菌多样性包括异养生物，自养生物（固氮）和病原体（植物病原体，海洋和人）。所有这些细菌群都需要螯合可生物利用的铁，这主要是通过生产铁载体来完成的。在这项研究中，进行了微观实验，以测试温育条件（温度，铁浓度，pH和碳源）对四种红树林沉积细菌分离株（大肠埃希氏菌，致癌肠杆菌，聚结泛菌和肠杆菌）的生长和铁载体产生的影响。 Bugandensis。我们的研究表明，在生长的滞后期和对数早期，在低铁浓度（10nM至1μM）下，所有分离株都产生更多的铁载体（30％至60％）。低温抑制细菌生长，而不会显着改变铁载体的产生，而低pH值抑制了这些分离物中的生长和铁载体的产生。尽管使用不同的碳源时，所有分离株均可产生铁载体，但葡萄糖是理想的碳源。观察到的生长和铁载体产生的变化可以归因于物种特异性的生理特性，铁的生物利用度的变化和/或两者的组合。我们的结果表明，在不断变化的全球环境中，周围水域的变暖可能不会减少铁载体的产生，因此，它们对于维持沉积物中的细菌活性至关重要。

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