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Effects of jasmonic acid signalling on the wheat microbiome differ between body sites.

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PubMed ID: 28134326

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Liu H, Carvalhais LC, Schenk PM, Dennis PG

Sci Rep. 

COMMENT: There is a lot of interest in knowing more about plant microbiome. In particular, to know the microbiome of different parts of the plant and learn how to manipulate it is very important in crops.

In humans, Immune system shapes the microbiome and the microbiome shapes the immune systems. In Plants, Jasmonic acid (JA) signalling is an important mechanism of defense against necrotrophic pathogens and herbivorous insects and has been shown to influence the root microbiome of Arabidopsis thaliana. In this study, the authors determined whether JA signalling influences the wheat microbiome and whether these effects are specific to particular parts of the plant.

It has been reported that activation of the JA signalling pathway increased the relative abundances of bacterial populations able to suppress phytopathogens and insects. Thus, it seems that plants may have evolved mechanisms to recruit symbionts that enhance their tolerance to this kind of threats. In addition, JA signalling has been shown to restrict endophytic colonisation of rice by incompatible strains of nitrogen-fixing Azoarcus bacteria.  The authors demonstrates that

Activation of JA signalling in wheat reduces the diversity and changes the composition of bacterial communities in endophytic roots but not in shoots or in the rhizosphere. Most of the root endophytic populations that became more abundant in response to JA signalling were closely related to taxa previously reported to suppress bacterial, fungal or viral phytopathogens, promote plant growth or mobilise nutrients

Finally, they hipothesized that

The change in root endophyte communities in response to JA signalling may reflect a coevolved mechanism by which plants recruit microbial symbionts that enhance host biotic stress tolerance when under attack.

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Eduardo Pareja