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The role of glomalin, a protein produced by arbuscular mycorrhizal fungi, in sequestering potentially toxic elements
2004
Gonzalez-Chavez, M.C. | Carrillo-Gonzalez, R. | Wright, S.F. | Nichols, K.A.
Naturally occurring soil organic compounds stabilize potentially toxic elements (PTEs) such as Cu, Cd, Pb, and Mn. The hypothesis of this work was that an insoluble glycoprotein, glomalin, produced in copious amounts on hyphae of arbuscular mycorrhizal fungi (AMF) sequesters PTEs. Glomalin can be extracted from laboratory cultures of AMF and from soils. Three different experiments were conducted. Experiment 1 showed that glomalin extracted from two polluted soils contained 1.6-4.3 mg Cu, 0.02-0.08 mg Cd, and 0.62-1.12 mg Pb/g glomalin. Experiment 2 showed that glomalin from hyphae of an isolate of Gigaspora rosea sequestered up to 28 mg Cu/g in vitro. Experiment 3 tested in vivo differences in Cu sequestration by Cu-tolerant and non-tolerant isolates of Glomus mosseae colonizing sorghum. Plants were fed with nutrient solution containing 0.5, 10 or 20 μM of Cu. Although no differences between isolates were detected, mean values for the 20 μM Cu level were 1.6, 0.4, and 0.3 mg Cu/g for glomalin extracted from hyphae, from sand after removal of hyphae and from hyphae attached to roots, respectively. Glomalin should be considered for biostabilization leading to remediation of polluted soils.
Show more [+] Less [-]Toxic effect of air pollution on plants : characterization of ozone fluxes and analysis and modelling of ozone impact on photosynthesis
2004
Le Thiec, Didier, | Dizengremel, Pierre, | Bethenod, Olivier, | Castell, Jean-François, | Biolley, J.P. | Leitão, Luís | Cellier, Pierre
Washington's water quality management plan to control nonpoint sources of pollution | Water quality summaries for watersheds in Washington State | Water quality programs in Washington State | Management strategies to control nonpoint source pollution in Washington State
2004-9999
Hashim, William A. | Stalmaster, Lauren
