Cd Accumulation Characteristics of Cirsium arvense var.Integrifolium and Response of Rhizosphere Bacterial Communities to Cd Stress
[Objective]To investigate the growth and accumulation characteristics of C.arvense under heavy metal Cd stress and the impact on the rhizosphere bacterial community.[Method]Through greenhouse potting experiments,we compared the differences in growth and Cd accumulation characteristics of C.arvense in soils with different Cd contents(0,4 and 16 mg/kg).We utilized high-throughput sequencing of 16S rDNA genes to determine the changing rules of the rhizosphere bacterial community structure of C.arvense under different soil Cd gradi-ents.[Result]The responses of C.arvense to Cd stress in the aerial part and root part were significantly different:plant height,basal diame-ter and the number of leaves all decreased with increasing soil Cd gradients,but root length increased first and then decreased with increasing soil Cd gradients.Cd stress showed a"low-promoting and high-suppressing"effect on the biomass of C.arvense.The biomass of C.arvense grown in 4 mg/kg soil was 52.68%higher than that of the control group(0 mg/kg).C.arvense had excellent Cd accumulation and transport capacity,with a bioaccumulation factor greater than five and a translocation factor greater than four.Cd stress had an effect on the rhizosphere bacterial community composition,and there is a significant difference in the relative abundance of dominant phyla in soil with different Cd gra-dients.[Conclusion]C.arvense can grow in Cd-containing soil(less than 16 mg/kg)and has an excellent accumulation ability,making it a potential Cd contaminated phytoremediation resource,and its rhizosphere bacterial community composition also responds to Cd stress.
C.arvenseCdEnrichment characteristicsPhytoremediationBacterial community structure
国家科技期刊平台
NSTL
万方数据
