Mountain Tai Forest Ecosystem Research Station of State Forestry Administration/Key Laboratory of State Forestry Administration for Silviculture of the Lower Yellow River, Tai'an, 271018, Shandong, China.
College of Seed and Facility Agricultural Engineering, Weifang University, No. 5147, Dongfeng East Street, Weifang, 261061, Shandong, China.
Environ Sci Pollut Res Int. 2024 Jul;31(33):45734-45746. doi: 10.1007/s11356-024-34221-w. Epub 2024 Jul 8.
2,4-Dinitrophenol (2,4-DNP) is recognized as an emerging contaminant due to its high toxicity and poor biodegradability, posing a threat to animals, plants, and human health. The efficient removal of 2,4-DNP remains a challenging issue in phytoremediation research, particularly because of its toxic effects on plants. To address this, a hydroponic simulation experiment was conducted to investigate the impact of adding exogenous methyl jasmonate (MeJA) on the tolerance and purification capabilities of Salix matsudana Koidz (S. matsudana) seedlings exposed to 2,4-DNP. The results indicated that the addition of exogenous MeJA mitigated the damage caused by 2,4-DNP to S. matsudana seedlings by enhancing the activity of antioxidant enzymes, reducing excess reactive oxygen species (ROS), lowering membrane lipid peroxidation, and minimizing membrane damage. Notably, the most effective alleviation was observed with the addition of 50 mg·L MeJA. Furthermore, exogenous MeJA helped maintain the biomass indices of S. matsudana seedlings under 2,4-DNP stress and increased the removal efficiency of 2,4-DNP by these seedlings. Specifically, the addition of 50 mg·L MeJA resulted in a removal percentage of 79.57%, which was 11.88% higher than that achieved with 2,4-DNP treatment. In conclusion, exogenous MeJA can improve the plant resistance and enhance 2,4-DNP phytoremediation.
2,4-二硝基苯酚（2,4-DNP）因其高毒性和较差的生物降解性而被认为是一种新兴的污染物，对动物、植物和人类健康构成威胁。高效去除 2,4-DNP 仍然是植物修复研究中的一个挑战问题，特别是因为它对植物的毒性作用。为了解决这个问题，进行了水培模拟实验，以研究添加外源茉莉酸甲酯（MeJA）对暴露于 2,4-DNP 的柳树（Salix matsudana Koidz）幼苗的耐受性和净化能力的影响。结果表明，添加外源 MeJA 通过增强抗氧化酶的活性、减少过量的活性氧（ROS）、降低膜脂质过氧化和最小化膜损伤，减轻了 2,4-DNP 对柳树幼苗的损伤。值得注意的是，添加 50mg·L 的 MeJA 效果最显著。此外，外源 MeJA 有助于维持柳树幼苗在 2,4-DNP 胁迫下的生物量指标，并提高这些幼苗对 2,4-DNP 的去除效率。具体而言，添加 50mg·L 的 MeJA 可使去除率达到 79.57%，比单独使用 2,4-DNP 处理时提高了 11.88%。总之，外源 MeJA 可以提高植物的抗性并增强 2,4-DNP 的植物修复。
