THE ROLE OF FUNGI ON ALLEVIATING THE STRESS INDUCED BY HEAVY METALS UPTAKE IN RYE PLANTS (SECALE CEREALE L.) CULTIVATED IN SOIL FROM A ROUMANIAN INDUSTRIAL AREA

摘要

In this paper there are presented results from a laboratory experiment performed on a polluted agricultural soil. Three types of soil were used: unpolluted soil (as a reference), polluted soil and amended with expanded clay and polluted soil amended with expanded clay and inoculated with mycorrhizal fungi, in which there were inseminated two species of plants: sunflower and rye. In this article only results obtained on rye are presented. It was performed the characterization of the soil determining, pH, electrical conductivity, humidity, forms of mineral N, assimilable P, and the content of metals. Using the vegetable material (roots and leaves), the content of metals and the following parameters: lipid peroxides (LP), a and b chlorophyll, carotenoids and the content of proteins were determined. It was analysed the influence of inoculated fungi (Glomus intraradices) on the absorption of heavy metals by plants. The results confirmed an increase in the transfer coefficients from soil to plant under the influence of the mycorrhiza formed in the case of the following metals: Cd, Ni, V, Zn and a decrease in the case of As, Co.Cr, Cu, Mn, U. The conclusion of this study is that mycorrhizal fungi produce an increase in the biomass production as well as in the concentration of some of the elements (As, Co, Cd, Cr, Mn, Ni, Pb and U) at root level, a phenomenon known as phytostabilization.