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首页> 外文期刊>Harmful Algae >Ability of marine eukaryotic red tide microalgae to utilize insoluble iron
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Ability of marine eukaryotic red tide microalgae to utilize insoluble iron

机译：海洋真核赤潮微藻利用不溶性铁的能力

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Iron is an essential trace metal and a limiting factor for microalgal growth, but bioavailable dissolved iron concentrations in seawater are low. Microalgal blooms have frequently occurred in coastal areas under such iron limitation accompanied by mass mortalities of fish and bivalves. Their massive growth despite physiological iron-deficiency has long been an enigma, because most of them cannot grow in chemically defined artificial media. We developed a feasible artificial medium for the culture of many species of red tide microalgae modified for investigation of iron utilization. Here, we report on the ability of marine eukaryotic red tide microalgae to utilize insoluble iron. Some microalgal species could utilize particulate FePO_4 and FeS for growth. Particulate FePO_4 was available for the growth of the raphidophyte Heterosigma akashiwo, the dinoflagellate Heterocapsa triquetra and the diatom Ditylum brightwellii. The dinoflagellates Heterocapsa circularisquama and Karenia mikimotoi, and the cryptophyte Rhodomonas ovalis utilized both particulate FePO_4 and particulate FeS for growth. In contrast, particulate FeO(OH) and Fe_2O_3 did not support the growth of any of the red tide microalgae examined. Except for Chattonella species (Raphidophyceae), the growth of red tide microalgae were confirmed in the medium with very easily soluble FeCl_3 added. The order of bioavailability of tested iron-source species were Fe-EDTA > FeCl_3 > FePO_4 > FeS > FeO(OH), Fe_2O_3 for most of microalgae examined, although for H. circularisquama the utilization of FeCl_3 was higher than that of Fe-EDTA. The results suggest that red tide microalgae show different patterns of specific strategies for the utilization of various iron sources. The occurrence of red tides in coastal areas may depend on the combination of microalgal species and insoluble iron species present.
机译：铁是必需的微量金属，也是微藻生长的限制因素，但是海水中可生物利用的溶解铁浓度较低。在这样的铁限制下，沿海地区经常发生微藻水华，并伴有大量鱼类和双壳类动物死亡。尽管生理上缺铁，它们的大量生长长期以来一直是一个谜，因为它们中的大多数不能在化学定义的人工培养基中生长。我们开发了一种可行的人工培养基，用于培养许多种类的赤潮微藻，以研究铁的利用情况。在这里，我们报告了海洋真核赤潮微藻利用不溶性铁的能力。一些微藻类物种可以利用颗粒状的FePO_4和FeS来生长。颗粒状的FePO_4可用于水生麦草，杂鞭藻，杂硅藻和硅藻Ditylum Brightwellii的生长。食鞭毛鞭毛异鳞藻和三叶卡雷尼亚菌，以及隐生植物卵圆红球菌利用颗粒状FePO_4和颗粒状FeS来生长。相反，颗粒状的FeO（OH）和Fe_2O_3不支持所检查的任何赤潮微藻的生长。除了沙通氏菌属（Raphidophyceae）以外，在添加了非常易溶的FeCl_3的培养基中也证实了赤潮微藻的生长。测试的大多数铁源物种的生物利用度顺序为：Fe-EDTA> FeCl_3> FePO_4> FeS> FeO（OH），Fe_2O_3，尽管对于圆鳞鳞茎，FeCl_3的利用率高于Fe-EDTA。 。结果表明，赤潮微藻显示出利用各种铁源的特定策略的不同模式。沿海地区赤潮的发生可能取决于存在的微藻种和不溶性铁种的组合。

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