Plant growth-promoting rhizobacteria-volatile organic compounds (PGPR-VOCs) have a vast number of applications in numerous industries due to their activity against microorganisms, virus and pro-oxidant substances. They could be applied to improve the postharvest quality of numerous crops or as a source of rhizobacteria. Low molecular weight compounds have multiple sources promoting the plant’s growth by increasing the amount of nutrients, making synergism and symbiotic processes with plants and enhancing the production of phytohormones and bioactive compounds. In this chapter, the main focus is to show how metabolomics tools are used to unravel secondary metabolites and volatile organic compounds produced by PGPR. It has been discovered that there is a huge chemical diversity and number of PGPR. Among the elucidated bioactive compounds are hydroxycinnamic acids, terpenic compounds, hydrocarbons, carbonyl compounds, alcohols and nitrogen and sulphur compounds. Also, thanks to the metabolomic approach, it has been possible to correlate PGPR with the biological source and correlate the bioactivity with the chemical structure of the metabolites, and this has led to the discovery and use of Azospirillum brasilense and Streptomyces albidoflavus as plant growth promoters for pharmaceutical and agro-industrial applications, useful for crops like Zea mays and Solanum lycopersicum which have been the most studied commercial plants in the metabolomic plant-bacteria interaction. Finally, it has been concluded that numerous PGPR of the same genus provide similar metabolites in different plant-bacteria interactions. Still there are numerous challenges related to the PGPR study due to their unstable chemical structure and the complexity of their biosynthesis. If those challenges can be solved in a near future, it will be possible to have a PGPR VOC metabolome with a vast amount of information, and the applications of rhizobacteria for the industry will face a substantial increase.
|Title of host publication||Secondary Metabolites and Volatiles of PGPR in Plant-Growth Promotion|
|Publisher||Springer International Publishing|
|Number of pages||24|
|State||Published - 1 Jan 2022|
- Metabolomic tools
- PGPR-secondary metabolites
- PGPR-volatile organic compounds