Novel insights into the factors influencing rhizosphere reactive oxygen species production and their role in polycyclic aromatic hydrocarbons transformation

IF 9.8 1区 农林科学 Q1 SOIL SCIENCE Soil Biology & Biochemistry Pub Date : 2024-08-20 DOI:10.1016/j.soilbio.2024.109562
Jinbo Liu , Siqi Shen , Kecheng Zhu , Ziyan Li , Na Chen , Eric Lichtfouse , Hanzhong Jia
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Abstract

Reactive oxygen species (ROS) are recognised as pivotal biogeochemical process drivers. However, the factors influencing ROS production in the rhizosphere and their role in pollutant transformation remain elusive. We investigated ROS with a focus on spatiotemporal variations in superoxide radicals (O2•−), hydrogen peroxide (H2O2), and hydroxyl radicals (OH) in the rhizosphere of maize during root development, and elucidated the impact of environmental conditions on ROS production. In-situ visualisation by fluorescence imaging showed that ROS hotspots gradually shifted from seminal to lateral roots during maize growth, indicating that newly developed roots are the major contributors to ROS production. The three types of ROS contents changed with root growth, suggesting that root development regulates ROS production. The ROS contents reached a maximum at 25 °C and 45% maximum field capacity. Both ambient temperature and soil moisture indirectly influenced ROS production by regulating the release of root exudates to induce changes in water-soluble phenols and dissolved organic carbon (DOC). In contrast, ROS content gradually increased with oxygen availability, which directly mediated ROS generation by acting as a precursor. More interestingly, the presence of polycyclic aromatic hydrocarbons (PAHs) significantly enhanced ROS generation, which further promoted PAH removal with a contribution of 31.4–43.3%. These findings provide new insights into the occurrence, distribution, and environmental effects of ROS in the rhizosphere.

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影响根瘤活性氧产生的因素及其在多环芳烃转化中作用的新见解
活性氧(ROS)被认为是生物地球化学过程的关键驱动因素。然而,影响根瘤菌圈中 ROS 生成的因素及其在污染物转化过程中的作用仍然难以捉摸。我们研究了 ROS,重点是玉米根系发育过程中根圈中超氧自由基(O2--)、过氧化氢(H2O2)和羟自由基(-OH)的时空变化,并阐明了环境条件对 ROS 产生的影响。荧光成像原位观察显示,ROS热点在玉米生长过程中逐渐从精根向侧根转移,表明新发根系是ROS产生的主要贡献者。三种类型的 ROS 含量随根的生长而变化,表明根的发育调节着 ROS 的产生。ROS 含量在 25 °C 时达到最大值,最大田间容量为 45%。环境温度和土壤湿度都通过调节根系渗出物的释放来引起水溶性酚类和溶解有机碳(DOC)的变化,从而间接影响 ROS 的产生。相比之下,ROS 含量随着氧气供应量的增加而逐渐增加,氧气作为前体直接促进了 ROS 的产生。更有趣的是,多环芳烃(PAHs)的存在显著促进了 ROS 的生成,而 ROS 的生成又进一步促进了多环芳烃的去除,其贡献率为 31.4-43.3%。这些发现为了解根瘤菌圈中 ROS 的发生、分布和环境效应提供了新的视角。
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来源期刊
Soil Biology & Biochemistry
Soil Biology & Biochemistry 农林科学-土壤科学
CiteScore
16.90
自引率
9.30%
发文量
312
审稿时长
49 days
期刊介绍: Soil Biology & Biochemistry publishes original research articles of international significance focusing on biological processes in soil and their applications to soil and environmental quality. Major topics include the ecology and biochemical processes of soil organisms, their effects on the environment, and interactions with plants. The journal also welcomes state-of-the-art reviews and discussions on contemporary research in soil biology and biochemistry.
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