Iron limitation of microbial phosphorus acquisition in the tropical North Atlantic.
Iron limitation of microbial phosphorus acquisition in the tropical North Atlantic.
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DOI：
10.1038/ncomms15465
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发表时间：
2017-05-19
影响因子：
16.6
通讯作者：
Moore CM
中科院分区：
文献类型：
--
作者：
Browning TJ;Achterberg EP;Yong JC;Rapp I;Utermann C;Engel A;Moore CM
在主要受氮限制的海洋的某些区域，微生物可能会受到磷的共同限制。在这样的区域内，一定比例的溶解有机磷池可以被采用各种碱性磷酸酶（APase）的微生物获得。与利用锌作为辅因子的APases的PhoA家族相反，最近在更广泛的PhoX和PhoD中发现铁作为辅因子意味着海洋锌，铁和磷循环之间的生物化学依赖性相互作用的潜力。在这里，我们证明了增强自然社区APase活性铁修正案内低锌和中度低铁西北大西洋。相比之下，我们没有发现任何证据的微量金属限制的APase活动在东大西洋撒哈拉尘埃羽。这种间歇性的铁限制微生物磷的收购提供了一个额外的方面在铁控制海洋氮和磷循环之间的耦合的论点。在氮磷共同限制的海洋区域，铁对溶解有机磷的影响受到很大限制。在这里，作者证明了铁施肥后天然海洋微生物群落的碱性磷酸酶活性增强。
In certain regions of the predominantly nitrogen limited ocean, microbes can become co-limited by phosphorus. Within such regions, a proportion of the dissolved organic phosphorus pool can be accessed by microbes employing a variety of alkaline phosphatase (APase) enzymes. In contrast to the PhoA family of APases that utilize zinc as a cofactor, the recent discovery of iron as a cofactor in the more widespread PhoX and PhoD implies the potential for a biochemically dependant interplay between oceanic zinc, iron and phosphorus cycles. Here we demonstrate enhanced natural community APase activity following iron amendment within the low zinc and moderately low iron Western North Atlantic. In contrast we find no evidence for trace metal limitation of APase activity beneath the Saharan dust plume in the Eastern Atlantic. Such intermittent iron limitation of microbial phosphorus acquisition provides an additional facet in the argument for iron controlling the coupling between oceanic nitrogen and phosphorus cycles. The influence iron exerts over the acquisition of dissolved organic phosphorus in regions of the oceans co-limited by nitrogen and phosphorus is poorly constrained. Here, the authors demonstrate enhanced alkaline phosphatase activity of natural marine microbial communities following iron fertilization.