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首页> 外文期刊>Marine Chemistry >Copper addition helps alleviate iron stress in a coastal diatom: Response of Chaetoceros gradlis from the Bay of Bengal to experimental Cu and Fe addition
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Copper addition helps alleviate iron stress in a coastal diatom: Response of Chaetoceros gradlis from the Bay of Bengal to experimental Cu and Fe addition

机译：铜的添加有助于缓解沿海硅藻的铁应力：孟加拉湾产的Chaetoceros gradlis对实验性添加Cu和Fe的响应

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Copper (Cu) is a transition metal with multi-oxidation states, and though it plays numerous roles in vital physiological and biochemical pathways including both photosynthesis and respiration, it can potentially be toxic at high concentrations. Coastal waters receive significant Cu input from a variety of anthropogenic sources which may affect fundamental biological processes including phytoplankton growth. We investigated the responses of the coastal diatom Chaetoceros gradlis to variable Cu concentrations using a local isolate from the SW coastal Bay of Bengal. The results suggested that Cu acted as a growth-promoting factor up to concentrations of 125 nM Cu (growth-promoting range), and became inhibitory thereafter (growth-inhibiting range). The cells in the control treatments had high ratios of photoprotective to light harvesting pigments (PP:LH) and high BSi:Chl-a, both indicative of Fe stress. Within the growth-promoting range, an increase in Cu supply significantly increased Chl-a concentrations, and decreased the ratios of PP:LH and BSi:Chl-a. Interestingly, iron (Fe) supplemented cells of C.gracilis revealed similar responses. We speculate that C.gracilis may utilize Cu to enhance Fe acquisition when Fe levels are inadequate. However, in the presence of Fe, the growth response of C.gracilis to variable Cu concentrations was not significant We infer that under Fe sufficient conditions, the need for Cu is minimized. Our study suggests that Cu plays a significant role in the physiology of coastal diatoms beyond the simple toxicological effects often investigated.
机译：铜（Cu）是一种具有多种氧化态的过渡金属，尽管它在重要的生理和生化途径（包括光合作用和呼吸作用）中发挥着重要作用，但在高浓度下可能具有毒性。沿海水域从各种人为来源获得大量的铜输入，这可能会影响包括浮游植物生长在内的基本生物过程。我们使用来自孟加拉国西南沿海海湾的本地分离物调查了沿海硅藻Chaetoceros gradlis对可变Cu浓度的响应。结果表明，Cu在高达125 nM Cu的浓度（生长范围）时起生长促进因子的作用，其后成为抑制性（生长抑制范围）。对照处理中的细胞具有高比例的光保护性颜料与光收集性颜料（PP：LH）和高BSi：Chl-a，均表明铁胁迫。在促进生长的范围内，铜供应的增加显着增加了Chl-a的浓度，并降低了PP：LH和BSi：Chl-a的比例。有趣的是，铁（Fe）补充的小球藻细胞显示出相似的反应。我们推测，当铁水平不足时，小球藻可能利用铜来增强铁的吸收。然而，在有铁的情况下，纤毛梭菌对可变的铜浓度的生长反应并不显着。我们推断在足够的铁条件下，对铜的需要量已降至最低。我们的研究表明，铜在沿海硅藻的生理中起着重要的作用，而不仅仅是经常研究的简单毒理作用。

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