Conlon Robert, Dowling David N, Germaine Kieran J
EnviroCORE Research Centre, South East Technological University (SETU), Kilkenny Road, R93 V960 Carlow, Ireland.
Microorganisms. 2025 Apr 8;13(4):848. doi: 10.3390/microorganisms13040848.
Rhizodegradation enhances pollutant degradation through plant-microbe interactions in the rhizosphere. Plant roots provide a colonisation surface and root exudates that promote microbial abundance and activity, facilitating organic pollutant breakdown via direct microbial degradation and co-metabolism. This study assessed the rhizodegradation of weathered petroleum hydrocarbons (PHCs) in heavy metal co-contaminated soil in a microcosm-scale pot trial. Treatments included , , a + mix, and , alongside a non-planted control. After 14 weeks, PHC concentrations were analysed via gas chromatography, and rhizosphere microbial communities were characterised through sequencing. achieved the highest PHC degradation (68%), significantly exceeding the non-planted control ( < 0.05, Kruskal-Wallis test). Hydrocarbon-degrading bacteria, including , , , unclassified sp., and , were enriched in the rhizosphere, with the uncultured clade mle1-27 potentially contributing indirectly. Metals analysis of plant tissues showed that mustard could accumulate copper more than lead and zinc, despite higher concentrations of zinc and lead in the soil. These results highlight the potential of for rhizoremediation in PHC-heavy metal co-contaminated soils.
根际降解通过根际中的植物 - 微生物相互作用增强污染物降解。植物根系提供了一个定殖表面和根系分泌物，促进微生物的丰度和活性，通过直接微生物降解和共代谢促进有机污染物的分解。本研究在微观尺度的盆栽试验中评估了重金属共污染土壤中风化石油烃（PHCs）的根际降解。处理包括 ， ， + 混合物，以及 ，同时设置了未种植的对照。14周后，通过气相色谱分析PHC浓度，并通过测序对根际微生物群落进行表征。 实现了最高的PHC降解率（68%），显著超过未种植的对照（ < 0.05，Kruskal - Wallis检验）。包括 、 、 、未分类的 菌属和 在内的烃降解细菌在根际中富集，未培养的分支mle1 - 27可能间接发挥作用。对植物组织的金属分析表明，尽管土壤中锌和铅的浓度较高，但芥菜积累铜的能力超过铅和锌。这些结果突出了 在PHC - 重金属共污染土壤中进行根际修复的潜力。
