Beneficial rhizobacteria dwell in plant roots and promote plant growth, development, and resistance to various stress types. In recent years there have been large-scale efforts to culture root-associated bacteria and sequence their genomes to uncover novel beneficial microbes. However, only a few strains of rhizobacteria from the large pool of soil microbes have been studied at the molecular level. This review focuses on the molecular basis underlying the phenotypes of three beneficial microbe groups; (1) plant-growth promoting rhizobacteria (PGPR), (2) root nodulating bacteria (RNB), and (3) biocontrol agents (BCAs). We focus on bacterial proteins and secondary metabolites that mediate known phenotypes within and around plants, and the mechanisms used to secrete these. We highlight the necessity for a better understanding of bacterial genes responsible for beneficial plant traits, which can be used for targeted gene-centered and molecule-centered discovery and deployment of novel beneficial rhizobacteria.
Bibliographical noteFunding Information:
ML is supported by the Landtagsstipendium from the Ministry of Science, Research and Arts from Baden-Württemberg in Germany. MC is supported by a scholarship from IFARHU. AL is supported by Alon Fellowship of the Israeli council of higher education. This research was supported by the Israel Science Foundation (Grant No. 1535/20).
© Copyright © 2020 Lucke, Correa and Levy.
- beneficial bacteria
- biocontrol agents
- plant growth promoting bacteria
- root nodulating bacteria
- secretion systems