Diversity of Endophytic Bacteria in Cardamine hupingshanensis and Potential of Culturable Selenium-Resistant Endophytes to Enhance Seed Germination Under Selenate Stress

Authors:
Publisher website
Google Scholar
Abstract
The endophytic bacterial communities of Se hyperaccumulator Cardamine hupingshanensis collected from greenhouse and selenium mining area in Enshi City were investigated by Illumina sequencing technology. In addition, 14 culturable endophytic selenium-resistant strains were isolated and their selenium tolerance and plant growth promotion abilities were studied. The results showed that phylum Proteobacteria predominated in all the plants (> 70%) regardless of their habitats, with most of the OTUs related to Betaproteobacteria, Alphaproteobacteria, and Gammaproteobacteria. Roots harbored many more OTUs and showed higher alpha diversities than the leaves. Both growing environment and specific microflora selection of plants were found to have noticeable effects on endophytic bacterial community structure. The 14 culturable endophytes belonging to 11 bacterial genera were able to resist different levels of selenite and selenate, with their MIC ranges of 10–120 mM and 100–600 mM. Among them, Oceanobacillus and Terribacillus genera were firstly reported for the selenium-tolerant properties of their members. Inoculation experiment revealed that three endophytic strains (CHP07, CHP08, and CHP14) with excellent plant growth-promoting traits were beneficial for growth of Brassica chinensis seeds at germination stage under 0.19 mM selenate stress.
Funding Information
  • Natural Science Foundation of Anhui Province (1808085QE176)
  • University Natural Science Research Project of Anhui Province (KJ2018A0444)
  • Excellent Young Talents Fund Program of Higher Education Institutions of Anhui Province (Gxgnfx2018054)

This publication has 40 references indexed in Scilit: