AMF对美人蕉修复水体除草剂污染的影响

摘要

Atrazine residue in water poses a serious threat to the environment and human health. Phytoremediation stood out as a potential technology for in⁃situ remediation of atrazine in the environment. A pot culture experiment was conducted to investigate the effects of arbuscular mycorrhizal fungi ( AMF ) on the phytoremediation of atrazine by Canna indica L. var. flava Roxb. The results demonstrated that arbuscular mycorrhizal fungi formed a stable symbiosis with canna a month after its inoculation, and the root colonization rate was (22.1±4.6)%. Arbuscular mycorrhizal fungi relieved the inhibition effect of atrazine on canna growth, and improved the plant height, root length and biomass of canna under the stress of atrazine; mycorrhizal dependency on the growth of canna was significant, and achieved the maximum value at 5 mg · L-1 concentration of atrazine. Inoculation of arbuscular mycorrhizal fungi significantly increased the canna phytoremediation degradation rate of atrazine, and reduced the half⁃life of atrazine;furthermore, inoculation of arbuscular mycorrhizal fungi improved the atrazine concentration range of canna phytoremediation. This study shows that canna inoculated with arbuscular mycorrhizal fungi is an ideal choice of atrazine pollution remediation, and may ultimately serve as a viable phytoremediation solution for in situ remediation of atrazine in water.%阿特拉津在水体中的残留对水生环境和人类健康具有重大的威胁，植物修复是针对环境中阿特拉津的有效原位修复方法．采用水培盆栽试验研究丛枝菌根真菌对美人蕉植物修复阿特拉津的影响，结果表明：在接种丛枝菌根真菌30 d后，美人蕉与丛枝菌根真菌形成稳定的共生关系，美人蕉根系的菌根侵染率达（22．1±4．6）％；丛枝菌根真菌缓解了阿特拉津对美人蕉生长的抑制作用，提高了在阿特拉津胁迫下美人蕉的株高、根长和生物量，菌根效应在美人蕉的生长上作用显著，并且在阿特拉津质量浓度为5 mg·L－1时，菌根效应达到最大值；接种丛枝菌根真菌可以显著提高美人蕉对阿特拉津的降解速率，减小阿特拉津的半衰期，并且提高美人蕉植物修复阿特拉津的适用质量浓度范围．接种丛枝菌根真菌的美人蕉是阿特拉津污染修复的理想选择，本研究为阿特拉津水体污染原位修复提供一种可行的解决方案．