The effects of uranium stress on physiological indicators, soil microorganisms, and enzyme activity of Sorghum sudanense
摘要
To evaluate the tolerance of soil environment to uranium stress, several experiments were carried out. Sorghum sudanense was taken as the research object, focused on the effects of uranium stress on plant physiological and biochemical indexes, soil enzymes and rhizosphere microorganisms with the experimental points uranium concentrations of 14.68 mg·kg−1, 26.66 mg·kg−1, 55.91 mg·kg−1 and 154 mg·kg−1, respectively. The experimental results showed that the content of malondialdehyde and proline in Sorghum sudanense significantly increased with the increase of uranium concentration at the sampling point. When the uranium concentration was 154 mg·kg−1, soil peroxidase activity, bacterial community species richness, and diversity were all relatively high and the antioxidant system cannot completely eliminate the reactive oxygen species produced by uranium stress, which inhibits the growth of Sorghum sudanense. Uranium stress significantly inhibited soil fungal communities, while uranium concentration of 26.66 mg·kg−1 had the most significant promoting effect on soil actinomycete community richness. The results indicated the comprehensive response mechanism of oxidative stress, root exudates and rhizosphere microorganisms under uranium stress, provided a theoretical basis for the remediation of uranium contaminated soil by Sorghum sudanense.