不同紫花苜蓿品种对PFOS富集特征差异及修复潜力研究OA

Perfluorooctane sulfonate(PFOS),as a typical persistent organic pollutant,has been recognized as posing a serious threat to ecosystems and human health.Phytoremedi-ation has attracted considerable attention due to its green and economical nature and among the relevant species,alfalfa(Medicago sativa L.)has been considered to exhibit promising application potential in pollution remediation owing to its large biomass and strong stress tol-erance.However,the differences in the responses of different alfalfa varieties to PFOS had not been clearly identified.A hydroponic experiment was conducted to compare the growth and accumulation characteristics of eight alfalfa varieties under different PFOS concentra-tions(0.2～2.0 mg/L).The results showed that a concentration-dependent effect of PFOS on alfalfa growth was observed and significant differences were detected among varieties.Specifically,the'Tianma'(high-yielding,disease-resistant)variety exhibited the highest biomass and the strongest tolerance.PFOS accumulated primarily in the root system,with the'Queen'(cold-and drought-tolerant)alfalfa variety demonstrating the best accumu-lation capacity,whilst the'Bara 218TR'(disease-resistant,stable-yielding)variety ex-hibited a strong ability to transport PFOS from the roots to the leaves.In terms of overall remediation efficiency,the'Bara 416WET'(wet-tolerant,fibrous-rooted)variety exhibi-ted the highest PFOS uptake capacity.Future research could focus on breeding superior vari-eties tailored to specific remediation objectives.