The phenomenon of plant mutualistic symbiosis with microbes may have a positive effect on the improvement of plant tolerance to environmental stresses as well as on the ability of plants to accumulate heavy metal (HM) ions from soil. The influence of Epichloë fungal endophyte (Ascomycota, Clavicipitaceae) on perennial ryegrass (Lolium perenne L.) plants grown in the presence of elevated concentrations of HM ions (Cd²⁺, Pb²⁺, and Cu²⁺) in soil was studied. The presence of Epichloë in the host grass tissues resulted in different accumulation of HM ions in the aboveground parts of the plants. In some cases, endophyte infection positively affected ryegrass ability to accumulate HM ions from soil. In plants with (E +) and without (E −) endophytes, the hormesis effect was induced by the elevated concentration of Cu²⁺ ions, resulting in better growth and photosynthesis, as examined by measurements of Chl a fluorescence. The obtained results indicate that based on the laboratory evaluation of the efficiency of HM accumulation, we were able to choose the best associations of perennial ryegrass with endophytes for HM phytoremediation.

植物与微生物的共生共生现象可能对提高植物对环境胁迫的耐受性以及植物从土壤中积累重金属（HM）离子的能力产生积极影响。研究了在土壤中高浓度 HM 离子（Cd ²⁺、Pb ²⁺和 Cu ^{2+ ）存在的情况下，} Epichloë真菌内生菌（子囊菌门、克拉维希科）对多年生黑麦草（Lolium perenne L.）植物的影响。Epichloë的存在寄主草组织中 HM 离子在植物地上部分的不同积累。在某些情况下，内生菌感染对黑麦草从土壤中积累 HM 离子的能力产生积极影响。在具有( E  + ) 和没有( E - ) 内生菌的植物中，通过提高叶绿素a荧光的测量值来检测，Cu ²⁺离子 浓度升高会诱导刺激作用，从而导致更好的生长和光合作用。获得的结果表明，基于对 HM 积累效率的实验室评估，我们能够选择多年生黑麦草与内生菌的最佳关联用于 HM 植物修复。