This Research Topic aims to collect selected contributions from the 12th PGPR Workshop, held in Toulouse, France, on May 29th - June 2nd, 2023.

The International PGPR Workshop series is the most comprehensive conference on the field of PGPR/PGPB (Plant Growth Promoting Rhizobacteria/Bacteria), with a long tradition that Professor Joseph W. Kloepper started in Canada in 1987. Subsequently, the Workshop has been held in Switzerland (1990), Australia (1994), Japan (1997), Argentina (2000), India (2003), The Netherlands (2006), Oregon (2009), Colombia (2012), Belgium (2015) and Canada (2018).

The 12th PGPR Workshop covers topics including growth promotion/induced resistance mechanisms, synthetic community composition with PGPR, the use of PGPR and its effect on microbiomes and soil microbial populations, the industrial applications of PGPR, including methods of fermentation and formulation, and the novel utilization of PGPR, in interaction with organisms other than higher plants.

This Research Topic aims to bring together new findings and applications of PGPR. In addition, given planet-wide adverse environmental phenomena, climate change, and disasters, we face an increasing challenge to preserve, rehabilitate, and restore damaged soils, where the use of PGPR/PGPB is a leading research field addressing these challenges and is expected to boom in the coming years. The Research Topic will also include bacterial symbiotic interactions for the biostimulant development.

Expected manuscripts should cover the subjects of the conference sessions:

- Historical and future perspectives of PGPR/PGPB research
- Old mechanisms and new ideas
- PGPR/PGPB Ecology
- PGPR/PGPB industry: Fermentation, formulation, delivery systems, and use
- Novel applications of PGPR/PGPB
- Microbiome and PGPR/PGPB

Contributors are welcome to submit Original Research, Methods, Mini-reviews, and Review articles.

Important Note: All contributions to this Research Topic must be within the scope of the section and journal to which they are submitted, as defined in their mission statements. Frontiers reserves the right to guide an out-of-scope manuscript to a more suitable section or journal at any stage of peer review.

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Frontiers in Plant Science

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