Wu Song-Lin, Chen Bao-Dong, Sun Yu-Qing, Ren Bai-Hui, Zhang Xin, Wang You-Shan
State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China.
Environ Toxicol Chem. 2014 Sep;33(9):2105-13. doi: 10.1002/etc.2661. Epub 2014 Aug 5.
In a greenhouse pot experiment, dandelion (Taraxacum platypecidum Diels.) and bermudagrass (Cynodon dactylon[Linn.] Pers.), inoculated with and without arbuscular mycorrhizal fungus (AMF) Rhizophagus irregularis, were grown in chromium (Cr)-amended soils (0 mg/kg, 5 mg/kg, 10 mg/kg, and 20 mg/kg Cr[VI]) to test whether arbuscular mycorrhizal (AM) symbiosis can improve Cr tolerance in different plant species. The experimental results indicated that the dry weights of both plant species were dramatically increased by AM symbiosis. Mycorrhizal colonization increased plant P concentrations and decreased Cr concentrations and Cr translocation from roots to shoots for dandelion; in contrast, mycorrhizal colonization decreased plant Cr concentrations without improvement of P nutrition in bermudagrass. Chromium speciation analysis revealed that AM symbiosis potentially altered Cr species and bioavailability in the rhizosphere. The study confirmed the protective effects of AMF on host plants under Cr contaminations.
在温室盆栽试验中，将接种和未接种丛枝菌根真菌（AMF）不规则球囊霉的蒲公英（Taraxacum platypecidum Diels.）和狗牙根（Cynodon dactylon[Linn.] Pers.）种植在添加铬（Cr）的土壤（0 mg/kg、5 mg/kg、10 mg/kg和20 mg/kg Cr[VI]）中，以测试丛枝菌根（AM）共生是否能提高不同植物物种对Cr的耐受性。实验结果表明，AM共生显著增加了两种植物的干重。菌根定殖增加了蒲公英的植物磷浓度，降低了铬浓度以及铬从根部向地上部的转运；相比之下，菌根定殖降低了狗牙根的植物铬浓度，但没有改善其磷营养状况。铬形态分析表明，AM共生可能改变了根际中铬的形态和生物有效性。该研究证实了AMF在Cr污染下对宿主植物的保护作用。
