Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, FI-40014, Finland.
Department of Integrative Biology, Oklahoma State University, 501 Life Sciences West, Stillwater, OK 74078, USA.
J R Soc Interface. 2023 Jan;20(198):20220472. doi: 10.1098/rsif.2022.0472. Epub 2023 Jan 4.
About 20 elements underlie biology and thus constrain biomass production. Recent systems-level observations indicate that altered supply of one element impacts the processing of most elements encompassing an organism (i.e. ionome). Little is known about the evolutionary tendencies of ionomes as populations adapt to distinct biogeochemical environments. We evolved the bacterium under five conditions (i.e. low carbon, nitrogen, phosphorus, iron or manganese) that limited the yield of the ancestor compared with replete medium, and measured the concentrations and use efficiency of these five, and five other elements. Both physiological responses of the ancestor, as well as evolutionary responses of descendants to experimental environments involved changes in the content and use efficiencies of the limiting element, and several others. Differences in coefficients of variation in elemental contents based on biological functions were evident, with those involved in biochemical building (C, N, P, S) varying least, followed by biochemical balance (Ca, K, Mg, Na), and biochemical catalysis (Fe, Mn). Finally, descendants evolved to mitigate elemental imbalances evident in the ancestor in response to limiting conditions. Understanding the tendencies of such ionomic responses will be useful to better forecast biological responses to geochemical changes.
大约有 20 种元素是生物的基础,因此限制了生物量的产生。最近的系统水平观察表明,一种元素供应的改变会影响到包含生物体在内的大多数元素的处理(即元素组)。对于生物体如何适应不同的生物地球化学环境,人们对元素组的进化趋势知之甚少。我们在五种条件下(即低碳、氮、磷、铁或锰)进化了细菌,这些条件限制了与充足培养基相比的祖先的产量,并测量了这五种和另外五种元素的浓度和利用效率。祖先的生理反应,以及后代对实验环境的进化反应都涉及到限制元素以及其他几个元素的含量和利用效率的变化。基于生物功能的元素含量变化系数差异明显,生化构建(C、N、P、S)所涉及的元素变化最小,其次是生化平衡(Ca、K、Mg、Na),最后是生化催化(Fe、Mn)。最后,后代进化以减轻祖先在限制条件下表现出的元素失衡。了解这种元素组响应的趋势将有助于更好地预测生物对地球化学变化的响应。