在无机磷源和有机磷源条件下生长的受限铁三藻的不同元素化学结构

IF 3.8 1区 地球科学 Q1 LIMNOLOGY
Xuechao Wang, Thomas J. Browning, Eric P. Achterberg, Martha Gledhill
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引用次数: 0

摘要

藻华蓝藻属(Trichodesmium spp.以前的研究表明,在营养限制条件下,浮游植物的大量碳:氮:磷元素组成偏离了经典的 "雷德菲尔德 "值。我们假设,毛藻细胞内代谢物的丰度和扩展的雷德菲尔德比率(包括一系列微量元素)会随着海洋中磷和铁的限制条件而变化。为了验证这一点,我们在痕量金属控制条件下生长了毛地黄,在这种条件下,磷以溶解无机磷(DIP)或溶解有机磷(DOP)的形式供应,从铁耗尽到铁含量升高。我们发现,在缺铁条件下,毛地黄藻的稳态扩展 Redfield 比率为(C106N15.82P0.62)1000Fe2.26Zn2.37Mn1.68Cu0.68Ni0.31Mo0.42Co0.03。在 DIP 处理中,毛地黄处于铁限制条件下;在 DOP 处理中,毛地黄处于铁磷共限条件下,细胞铁:碳:(C106N13.89P0.49)1000Fe3.38Zn2.51Mn0.97Cu0.52Ni0.42Mo0.33Co0.03。在 DIP 处理(铁限制)中,稳态细胞铁:碳的平均值仅为对照处理的 50%,而锌:碳则增加了两倍。铁限制恢复后,DIP 处理的平均扩展 Redfield 比率为(C106N16.8P0.7)1000Fe4.41Zn1.44Mn1Cu0.52Ni0.19Mo0.3Co0.03,DOP 处理为(C106N15.9P0.73)1000Fe7.36Zn2.24Mn1.08Cu0.71Ni0.63Mo0.38Co0.02。在不同处理条件下,毛地黄藻产生的目标代谢物的碳归一化丰度没有明显变化。这些结果表明,毛地黄藻采用了不同的策略来应对铁/磷限制,这反映在其扩展的雷德菲尔德比率上。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Different elemental stoichiometries of Fe‐limited Trichodesmium when grown under inorganic and organic phosphorus sources
Trichodesmium spp. is a colonial diazotrophic cyanobacterium found in the oligotrophic (sub)tropical oceans, where its distribution is strongly regulated by the availability of phosphorus and iron. The bulk carbon : nitrogen : phosphorus elemental composition of phytoplankton has previously been shown to depart from classical “Redfield” values under nutrient‐limitation conditions. We hypothesized that the abundance of intracellular metabolites and the extended Redfield ratios of Trichodesmium, including a range of trace elements, are variable in response to conditions of phosphorus and iron limitation that are found in the ocean. To test this, we grew Trichodesmium under trace metal–controlled conditions, where phosphorus was supplied as either dissolved inorganic phosphorus (DIP) or dissolved organic phosphorus (DOP) from iron depleted to elevated levels. We found that the steady‐state extended Redfield ratios of Trichodesmium under the iron‐depleted condition was (C106N15.82P0.62)1000Fe2.26Zn2.37Mn1.68Cu0.68Ni0.31Mo0.42Co0.03 for the DIP treatment where Trichodesmium was under iron limitation, and (C106N13.89P0.49)1000Fe3.38Zn2.51Mn0.97Cu0.52Ni0.42Mo0.33Co0.03 for the DOP treatment where Trichodesmium was under iron–phosphorus co‐limitation. Mean steady‐state cellular iron : carbon in the DIP treatment (iron limited) was only 50% of that in the control treatment, while zinc : carbon was elevated twofold. The average extended Redfield ratios following recovery from iron limitation was (C106N16.8P0.7)1000Fe4.41Zn1.44Mn1Cu0.52Ni0.19Mo0.3Co0.03 for the DIP and (C106N15.9P0.73)1000Fe7.36Zn2.24Mn1.08Cu0.71Ni0.63Mo0.38Co0.02 for the DOP treatment. No significant changes were observed in the carbon‐normalized abundance of targeted metabolites produced by Trichodesmium, under the different treatments. These results suggest Trichodesmium employs different strategies to cope with iron/phosphorus limitation, which is reflected in its extended Redfield ratios.
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来源期刊
Limnology and Oceanography
Limnology and Oceanography 地学-海洋学
CiteScore
8.80
自引率
6.70%
发文量
254
审稿时长
3 months
期刊介绍: Limnology and Oceanography (L&O; print ISSN 0024-3590, online ISSN 1939-5590) publishes original articles, including scholarly reviews, about all aspects of limnology and oceanography. The journal''s unifying theme is the understanding of aquatic systems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which they can be generalized beyond the particular aquatic system examined. Laboratory and modeling studies must demonstrate relevance to field environments; typically this means that they are bolstered by substantial "real-world" data. Few purely theoretical or purely empirical papers are accepted for review.
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