Doubková Pavla, Sudová Radka
Institute of Botany, Academy of Sciences of the Czech Republic, 252 43, Průhonice, Czech Republic,
Mycorrhiza. 2014 Apr;24(3):209-17. doi: 10.1007/s00572-013-0532-9. Epub 2013 Oct 18.
Serpentine soils have naturally elevated concentrations of certain heavy metals, including nickel. This study addressed the role of plant origin (serpentine vs. non-serpentine) and symbiosis with arbuscular mycorrhizal fungi (AMF) in plant Ni tolerance. A semi-hydroponic experiment involving three levels of Ni and serpentine and non-serpentine AMF isolates and populations of a model plant species (Knautia arvensis) revealed considerable negative effects of elevated Ni availability on both plant and fungal performance. Plant growth response to Ni was independent of edaphic origin; however, higher Ni tolerance of serpentine plants was indicated by a smaller decline in the concentrations of photosynthetic pigments and restricted root-to-shoot Ni translocation. Serpentine plants also retained relatively more Mg in their roots, resulting in a higher shoot Ca/Mg ratio. AMF inoculation, especially with the non-serpentine isolate, further aggravated Ni toxicity to host plants. Therefore, AMF do not appear to be involved in Ni tolerance of serpentine K. arvensis plants.
蛇纹岩土中某些重金属（包括镍）的天然含量较高。本研究探讨了植物来源（蛇纹岩土与非蛇纹岩土）以及与丛枝菌根真菌（AMF）共生在植物耐镍性中的作用。一项半水培实验涉及三种镍水平以及蛇纹岩土和非蛇纹岩土的AMF分离株和一种模式植物物种（田野山萝卜）的种群，结果表明镍有效性升高对植物和真菌的表现均有相当大的负面影响。植物对镍的生长反应与土壤来源无关；然而，蛇纹岩土植物较高的耐镍性表现为光合色素浓度下降较小以及根对地上部的镍转运受到限制。蛇纹岩土植物的根部也保留了相对较多的镁，导致地上部钙/镁比值较高。接种AMF，尤其是接种非蛇纹岩土分离株，会进一步加剧镍对宿主植物的毒性。因此，AMF似乎未参与蛇纹岩土田野山萝卜植物的耐镍过程。
