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摘要
The underlying toxicities of hexabromocyclododecane (HBCD) and lead (Pb) and their toxic effects pose a serious threat to the ecosystem and human beings. As a serious pollutant released from electronic waste, Pb-HBCD has a strong toxic effect on the soil-plant ecosystem. Under Pb-HBCD stress, plant cells produce large amounts of reactive oxygen species (ROS), which cause severe oxidative damage. However, most plants can eliminate active oxygen via active oxygen scavengers (enzymatic and nonenzymatic synthesis). Flavonols are major nonenzymatic active oxygen scavengers that can alleviate ROS accumulation, thereby protecting plants from the damage ROS can cause. The results presented here show that Pb-HBCD stress seriously inhibits plant growth parameters, including germination rate and plant height. However, the exogenous application of flavonols can improve the tolerance of Arabidopsis toward Pb-HBCD by increasing the ROS scavenging ability. 16S rRNA gene sequencing was performed on soil samples to study rhizosphere microbial changes. In the order level, the Pb-HBCD group exhibited variations of richness and diversity compared with the control group. The group with added flavonols showed no obvious changes, indicating that the alleviating effect of exogenous flavonols may mainly depend on the plant system. Our research provides an efficient and clean method to address Pb-HBCD stress in soil.
- 出版日期2017-11
- 单位山东大学
