Effects of Low Lead Content on the Microbial Community in the Rhizosphere of Winter Wheat Seedlings under the Stress of Cadmium

Abstract:

The Biolog Eco method was used to investigate the effect of low lead content (< 350 mg/kg dry weight soil, soil pH > 7.5) on the rhizosphere microbial community of potted winter wheat seedlings under the stress of cadmium. The low lead content significantly results in the shift of rhizosphere carbon source utilization of microorganisms, microbial metabolic diversity indexes, and microbial community structure in the stress of cadmium. And it mainly strengthens the inhibition of cadmium on the ability of the rhizosphere microbes to utilize different carbon resources, meanwile enhances the effect of cadmium on the microbial metabolic diversity. Furthermore, the correlation between rhizosphere microbial metabolic diversity indexes and the content of simple sugars and phenolic acid exudates under Pb/Cd is obviously different from that under Cd, and the correlation direction and the significant level all change evidently.