John Wiley & Sons, Ltd.

CHROMIUM RESISTANCE OF DANDELION (TARAXACUM PLATYPECIDUM DIELS.) AND BERMUDAGRASS (CYNODON DACTYLON (LINN.) PERS.) IS ENHANCED BY ARBUSCULAR MYCORRHIZA IN CR(VI) CONTAMINATED SOILS

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In a greenhouse pot experiment, dandelion (Taraxacum platypecidum Diels.) and bermudagrass (Cynodon dactylon (Linn.) Pers.), inoculated with/without arbuscular mycorrhizal fungus (AMF) Rhizophagus irregularis, were grown in chromium (Cr) amended soils (0, 5, 10, 20 mg/kg Cr(VI)) to test whether AM symbiosis can improve Cr tolerance of 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 while decreased Cr concentrations and Cr translocation from roots to shoots for dandelion; by contrast, mycorrhizal colonization decreased plant Cr concentrations without improvement of P nutrition for 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. Environ Toxicol Chem © 2014 SETAC

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