How autochthonous microorganisms influence physiological status of Zea mays L. cultivated on heavy metal contaminated soils

摘要: The aim of this study was to investigate the effect autochthonous microorganisms present in soil collected from heavy metal (HM) uncontaminated (Pb ≈ 59 mg kg−1, Cd ≈ 0.4 mg kg−1, Zn ≈ 191 mg kg−1), moderately (Pb ≈ 343 mg kg−1, Cd ≈ 12 mg kg−1, Zn ≈ 1876 mg kg−1), and highly (Pb ≈ 1586 mg kg−1, Cd ≈ 57 mg kg−1, Zn ≈ 3280 mg kg−1) contaminated sites on Zea mays elemental composition, physiological status, growth parameters. For purpose, half sterilized characterization performed. After 45 days cultivation, presence HM negatively affected photosynthesis transpiration rates, relative chlorophyll content, anthocyanins index, fluorescence parameters, content oxidative stress products (H2O2 Malondialdehyde) mays, while sterilization had a positive those Average percentage colonization root segments by arbuscular mycorrhiza fungi decreased with an increase contamination soil. shoot concentration HMs, particularly Cd Zn, result soils sterilization. Aboveground biomass maize cultivated 3-fold, 1.5-fold, 1.5-fold higher for uncontaminated, respectively when compared nonsterilized soils. Contrary our expectation, microflora did not improve plant photosynthetic performance; fact, they negative processes although reduce HMs shoots grown