Non-targeted metabolomics reveal the impact of phenanthrene stress on root exudates of ten urban greening tree species

文献类型： 外文期刊

第一作者： Chen, Xiaoyong

作者： Chen, Xiaoyong;Yan, Wende;Shakoor, Awais;Yan, Wende;Wang, Jiaolong;Aslam, Ali;Farooq, Taimoor Hassan;Shakoor, Awais;Aslam, Ali;Chen, Xiaoyong

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关键词： Pollutants; Root exudation; Polycyclic aromatic hydrocarbons; Phytoremediation; Rhizosphere

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：5.715； 五年影响因子：5.735 ）

ISSN： 0013-9351

年卷期： 2021 年 196 卷

页码：

收录情况： SCI

摘要： Different root exudations can modify the bioavailability of persistent organic pollutants (POPs). Among these exudations, the low molecular weight organic acids play an imperative role in this process. The study was conducted to analyze the effect of phenanthrene (PHE) stress on root exudation variations and changes in its chemical composition in ten urban greening tree species, namely Loropetalum chinense, Gardenia ellis, Photinia fraseri, Ligustrum japonicum, Rhododendron simsii, Osmanthus fragrans, Gardenia jasminoides, Buxus sinica, Camellia sasanqua, and Euonymus japonicas. The experiment was carried out in three PHE concentration treatments (0 mg kg-1 (CK), 200 mg kg-1 (PHEL), 2000 mg kg-1 (PHEH)). The root exudates were collected and analyzed by GCMS method. In total, 673 compounds were identified either with high or low abundance among all species and treatments. Compounds identified in CK, PHEL, and PHEH were 240, 180, and 256, respectively. The results illustrated that carbohydrates, phenols, and esters were the dominant compounds, accounted for more than 92%. Principal component analysis depicted that tree species grown in PHEH showed obvious alteration in compounds of root exudation, whereas little difference was noticed between PHEL and CK. Phenols (80%) were the most abundant, while nitriles contributed a small portion. Moreover, among all species, R. simsii released the maximum number of compounds, and L. japonicum released the least number of compounds accounting for 89 and 46, respectively. The results achieved here to illustrate that plant type, and PHE stress can significantly change the concentrations and species of root exudates. This study provides the scientific reference for understanding the phenanthrene responsive changes in root exudates and phytoremediation of polycyclic aromatic hydrocarbons (PAHs), as well as a screening of urban greening tree species.

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