Chapter 5.2.1.6 - Phosphorus control of plant interactions with mutualistic and pathogenic microorganisms: a mini‐review and a case study of the Medicago truncatulaB9 mutant

International audiencePhosphorus (P) is an important macroelement necessary for plant growth and development but is often limiting in the environment. Plants adapt to P limitation by initiating a P starvation response (PSR) to better adjust their development and metabolism to this limiting resource. Not surprisingly, P plays a key role in mutualistic and pathogenic interactions. After a brief review on the regulation of plant–microbe interactions by P, we will discuss whether the Medicago truncatula B9 mutant which displays an altered P status and which is hypermycorrhizal, partially nodulation‐defective and hypersusceptible to the pathogen Aphanomyces euteiches could represent a case of P control of plant immunity in the light of recent findings in this field