Abstract
Pseudomonas spp. are aerobic, Gram-negative bacteria that are ubiquitously found in soils. They are particularly well suited for plant root colonization and many strains display plant growth-promoting and/or biocontrol activity against various plant pathogens. Their ability to metabolize a wide array of nutrients, their rapidity and ease of growth and their natural abundance in variety of plant-soil environments make them promising organisms for the development of commercial biocontrol and biofertilizer products. In this chapter, we will discuss their diversity, genetics and ecology, while putting special emphasis on the mechanisms involved in biocontrol and/or plant growth promotion. Recent progress in genomics and transcriptomics, as well as future research on these organisms will also be discussed.
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