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Arbuscular mycorrhizal fungi induce lower concentration but higher acquisition of Cd in cucumber(Cucumis sativus L.) plant cultivated on a Cd-contaminated soil

Arbuscular mycorrhizal fungi induce lower concentration but ...

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第八次全国土壤生物与生物化学学术研讨会暨第三次全国土壤健康学术研讨会

作者： Junli Hu Wing Tsang Fuyong Wu Shengchun Wu Junhua Wang Xiangui Lin Ming Hung Wong State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of Sciences Croucher Institute for Environmental Sciences Department of BiologyHong Kong Baptist University Joint Open Laboratory of Soil and the Environment Hong Kong Baptist University & Institute of Soil ScienceChinese Academy of Sciences College of Natural Resources and Environment Northwest A&F University School of Environmental and Resource Sciences Zhejiang A&F University Consortium on Health EnvironmentEducation and ResearchDepartment of Science and Environmental StudiesThe Hong Kong Institute of Education

The trasfer risk of cadmium(Cd) accumulated in stems and leafs of fruiting vegetables,which are generally considered to be more suitable to plant on Cd-contaminated farms,is a major issue encountered with the usage of such non-edible *** 8-week pot experiment was conducted to investigate the acquisition and translocation of Cd by cucumber(Cucumis sativus L.) plant on an unsterilized Cd-contaminated(1.6 mg kg) soil in response to inoculating arbuscular mycorrhizal(AM)fungus,Funneliformis caledonium(Fc) or glomus versiforme(Gv).Compared with the non-inoculated control,both Fc and Gv inoculations significantly increased(P<0.05) root mycorrhizal colonization rates and phosphorus(P) acquisition efficiencies,and total P acquisitions and biomasses of cucumber plants,while only Fc inoculation significantly increased(P<0.05) soil acid phosphatase activity and available P *** Fc and Gv inoculations significantly increased(P<0.05) P translocation factors from root to shoot,inducing significantly higher(P<0.05) shoot P concentrations and shoot/root biomass ratios relative to the *** contrast,both Fc and Gv inoculations significantly decreased(P<0.05) root and shoot Cd concentrations,causing significantly increased(P<0.05) P/Cd concentration ratios in both root and shoot,while only Gv inoculation significantly decreased(P<0.05) root Cd acquisition efficiency and increased(P<0.05) Cd translocation factor from root to *** addition,AM fungal inoculations also tended to decrease soil total and phytoavailable Cd concentrations via elevating plant total Cd acquisitions and soil pH,*** results demonstrated the potential application of AM fungi in the production of low-Cd vegetables,including the non-edible parts,in Cd-contaminated soils.

关键词： Funneliformis caledonium glomus versiforme Root acquisition efficieny Soil acid phosphatase Soil DTPA-extractable Cd Soil pH

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