Effects of Cr Stress on Bacterial Community Structure and Composition in Rhizosphere Soil of Iris tectorum under Different Cultivation Modes

With the rapid development of industry, Cr has become one major heavy metal pollutants in soil, severely impacting soil microecology, among which rhizosphere microorganisms can improve microenvironment to promote plant growth. However, how bacterial communities respond stress under different cultivation modes remains be further studied. Therefore, this study, a greenhouse pot experiment combined with 16S rRNA high-throughput sequencing technology was used study effects at 200 mg kg−1 on community structure and diversity Iris tectorum modes. The results showed that index (Shannon Simpson) abundance (Ace Chao) increased significantly wetland stress. Moreover, changed by 20.1% due addition Cr, leading 15.9% decrease common species community, Proteobacteria, Actinobacteria, Chloroflexi, Acidobacteriota accounted for more than 74.8% total sequence. increase diversity, rhizosphere-dominant bacteria growth-promoting significantly. Meanwhile, symbiotic network analysis found two modes, synergistic effect between dominant enhanced, improved. In addition, through redundancy analysis, it C, N, P nutrients uncontaminated were main driving factors succession I. tectorum, content contaminated factor rhizosphere. summary, will provide basis response interaction plants restoration