翻译：Polycyclicaromatichydrocarbons(P

翻译 ： Polycyclic aromatic hydrocarbons (PAHs) are a group of extremely carcinogenic organic pollutants. Our previous findings have demonstrated that plant roots actively take up PAHs through co-transport with H+ ions. Auxin serves as a pivotal regulator of plant growth and development. However, it remains unclear whether the hormone can enhance the uptake of PAHs by plant roots. Hence, the wheat root exposed to PAHs with/without auxins was set to investigate how the auxin promotes the PAHs uptake by roots. In our study, auxin could significantly enhance the uptake of PAHs after 4 h of exposure. After the addition of auxin, the root tissue cytoplasmic pH value was decreased and the H+influx was observed, indicating that the extracellular space was alkalinized in a short time. The increased H+influx rate enhanced the uptake of PAHs. In addition, the H+ ATPase activity was also increased, suggesting that auxin activated two distinct and antagonistic H+ pathways, and the H+flux influx pathway was dominant. Our findings offer important information for exploring the mechanism underlying auxin regulation of PAHs uptake and the phytoremediation of PAH-contaminated soil and water. 多环芳烃（PAHs）是一类强致癌性有机污染物。我们前期研究发现，植物根系通过H+共转运的方式主动吸收PAHs。生长素（Auxin）作为植物生长发育的关键调控因子，然而该激素是否能增强植物根系对PAHs的吸收仍不明确。为此，本研究设置小麦根系在添加/未添加生长素的PAHs暴露体系，以探究生长素促进根系吸收PAHs的机制。结果显示，暴露4小时后生长素能显著促进PAHs的吸收。添加生长素后，根系细胞质pH值降低并伴随H+内流现象，表明胞外环境在短时间内发生碱化。H+内流速率的增加增强了PAHs的吸收效率。此外，H+-ATP酶活性同步提升，说明生长素激活了两条独立且拮抗的H+转运途径，其中H+内流途径占据主导地位。该研究为揭示生长素调控PAHs吸收的分子机制及PAHs污染水土的植物修复提供了重要理论依据。 supported by the National Key Research and Development Program of China (2021YFC1809103) and the National Natural Science Foundation of China (31770546, 31370521). Journal of Hazardous Materials Volume 465, 5 March 2024, 133077