College of Life Science and Technology, Central South University of Forestry and Technology, Changsha, 410004, Hunan Province, PR China.
College of Life Science and Technology, Central South University of Forestry and Technology, Changsha, 410004, Hunan Province, PR China; National Engineering Laboratory for Applied Technology of Forestry and Ecology in South China, Changsha, 410004, Hunan Province, PR China.
Environ Res. 2021 May;196:110370. doi: 10.1016/j.envres.2020.110370. Epub 2020 Oct 22.
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 (CK), 200 mg kg (PHE), 2000 mg kg (PHE)). The root exudates were collected and analyzed by GC-MS method. In total, 673 compounds were identified either with high or low abundance among all species and treatments. Compounds identified in CK, PHE, and PHE 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 PHE showed obvious alteration in compounds of root exudation, whereas little difference was noticed between PHE 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.
不同的根系分泌物可以改变持久性有机污染物（POPs）的生物可利用性。在这些分泌物中，低分子量有机酸在这一过程中起着重要作用。本研究旨在分析菲（PHE）胁迫对 10 种城市绿化树种根系分泌物变化及其化学成分组成的影响，这 10 种树种分别为：杜英、栀子、石楠、女贞、杜鹃、桂花、茉莉、黄杨、茶梅和冬青。实验在 3 种 PHE 浓度处理（0 mg kg（CK）、200 mg kg（PHE）、2000 mg kg（PHE））下进行。采用 GC-MS 法收集和分析根分泌物。在所有物种和处理中，共鉴定出 673 种高丰度或低丰度的化合物。在 CK、PHE 和 PHE 中分别鉴定出 240、180 和 256 种化合物。结果表明，碳水化合物、酚类和酯类是主要化合物，占 92%以上。主成分分析表明，在 PHE 中生长的树种，其根系分泌物的化合物明显发生变化，而 PHE 与 CK 之间几乎没有差异。酚类（80%）含量最丰富，而腈类化合物含量较少。此外，在所有树种中，杜鹃释放的化合物数量最多，女贞释放的化合物数量最少，分别为 89 和 46。本研究结果表明，植物类型和 PHE 胁迫可以显著改变根系分泌物的浓度和种类。这为了解根分泌物对菲的响应变化以及多环芳烃（PAHs）的植物修复提供了科学参考，同时也为城市绿化树种的筛选提供了参考。
Zotero 插件