Luxury iron uptake and storage in pennate diatoms from the equatorial Pacific Ocean
Luxury iron uptake and storage in pennate diatoms from the equatorial Pacific Ocean
复制标题
赤道太平洋羽状硅藻对铁的大量吸收和储存
DOI：
10.1093/mtomcs/mfac035
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发表时间：
2022
期刊：
影响因子：
3.4
通讯作者：
Baines, Stephen B.
中科院分区：
文献类型：
--
作者：
Twining, Benjamin S.;Baines, Stephen B.
铁是海洋浮游植物的关键微量营养素，铁的可用性控制着海洋大区域的初级生产和群落组成。羽状硅藻是一种浮游植物，在低铁地区对铁的添加做出反应，可以具有高度可变的铁含量，并且一些群体，如假菱形藻，已知使用铁蛋白来储存铁以供以后使用。我们量化和映射的细胞内积累的铁由一个自然人口的Pseudo-nitzarena从铁有限的赤道太平洋。总共48小时后，铁添加，近一半的积累铁定位在存储机构附近的叶绿体被认为是代表铁蛋白。在随后的48小时内，储存的铁通过随后的生长和分裂分配到细胞的其余部分，部分支持子细胞的铁含量。这项研究提供了第一个定量的观点，铁在全球相关的浮游植物组的细胞贩运，并展示了独特的能力，同步加速器为基础的元素成像方法。
Iron is a key micronutrient for ocean phytoplankton, and the availability of iron controls primary production and community composition in large regions of the ocean. Pennate diatoms, a phytoplankton group that responds to iron additions in low-iron areas, can have highly variable iron contents, and some groups such asPseudo-nitzschia, are known to use ferritin to store iron for later use. We quantified and mapped the intracellular accumulation of iron by a natural population ofPseudo-nitzschiafrom the Fe-limited equatorial Pacific Ocean. A total of 48 h after iron addition, nearly half of the accumulated iron was localized in storage bodies adjacent to chloroplasts believed to represent ferritin. Over the subsequent 48 h, stored iron was distributed to the rest of the cell through subsequent growth and division, partially supporting the iron contents of the daughter cells. This study provides the first quantitative view into the cellular trafficking of iron in a globally relevant phytoplankton group and demonstrates the unique capabilities of synchrotron-based element imaging approaches.