Effects of arbuscular mycorrhizal fungi colonization on toxicity of soil contaminated by heavy metals to Vicia faba
重金属污染土壤接种丛枝菌根真菌对蚕豆毒性的影响

Vicia faba was selected as a host plant in a greenhouse-pot-culture experiment to investigate the effects of arbuscular mycorrhizal fungi (AMF) colonization on the toxicity to Vicia faba induced by heavy metal contaminated soil. The results suggested that AMF colonization decreased the toxicity of heavy metals to Vicia faba. Compared with control, the P uptake was increased by AMF colonization but the biomass of mycorrhizal plants was not increased by AMF colonization. It showed large differences in uptakes of four heavy metals by mycorrhizal and nonmycorrhizal Vicia faba: AMF colonization enhanced the uptakes of Cu, Zn, Pb and Cd by Vicia faba. There existed large differences in DNA damage in the leaves of nonmycorrhizal and mycorrhizal plants detected by single cell gel electrophoresis,SCGE. The DNA damage in the leaves was increased by AMF colonization which was consistent with the increased metals uptake induced by AMF colonization.