Abstract
The genera Serratia and Enterobacter belong to the Enterobacteriaceae family and several members have been described as plant growth-promoting rhizobacteria (PGPR). However, how these bacteria influence growth and development is unclear. We performed in vitro interaction assays between either Serratia sp. H6 or Enterobacter sp. L7 with Arabidopsis thaliana seedlings to analyze their effects on plant growth. In experiments of co-cultivation distant from the root tip, Enterobacter sp. decreased root length, markedly increased lateral root number, and slightly increased plant biomass by 33%, 230%, and 69%, respectively, and relative to the control. The volatile organic compounds (VOCs) emitted from Serratia sp. H6 but not those from Enterobacter sp. L7 promoted Arabidopsis growth. A blend of volatile compounds from the two bacteria had effects on plant growth that were similar to those observed for volatile compounds from H6 only. At several densities, the direct contact of roots with Serratia sp. H6 had phytostimulant properties but Enterobacter sp. L7 had clear deleterious effects. Together, these results suggest that direct contact and VOCs of Serratia sp. H6 were the main mechanisms to promote plant growth of A. thaliana, while diffusible compounds of Enterobacter sp. L7 were predominant in their PGPR activity.
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This study was supported by the Coordinación de la Investigación Científica, Universidad Michoacana de San Nicolás de Hidalgo, México.
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NSGI performed the experiments; ECM contributed to technical assistance; EGP designed the study and the methodological strategy; HRC, JCG, JLB, and EGP wrote and revised the manuscript.
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Supplementary Fig. 1
Phylogenetic trees of H6 (a) and L7 (b) strains and type strains (superscript T) of the closely related species derived from the maximum likelihood method based on the partial sequence of the 16S rRNA gene. GenBank accession numbers are indicated in parentheses. Bootstrap values (based on 1000 replication) > 50% are shown at branch points. (EPS 1161 kb)
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González-Ista, N.S., Castro-Mercado, E., la Cruz, H.Rd. et al. Comparison of the Rhizobacteria Serratia sp. H6 and Enterobacter sp. L7 on Arabidopsis thaliana Growth Promotion. Curr Microbiol 80, 117 (2023). https://doi.org/10.1007/s00284-023-03227-x
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DOI: https://doi.org/10.1007/s00284-023-03227-x