About mycorrhizal fungi and induced systemic resistance to Early Blight:
Mechanism of tomato plants enhanced disease resistance against early blight primed by arbuscular mycorrhizal fungus Glomus versiforme
Interplant Communication of Tomato Plants through
Underground Common Mycorrhizal Networks
Resistance induction in the
pathosystem tomato – Alternaria solani
Quote:
Arbuscular mycorrhizal fungi are an effective bioprotectant against Alternaria in
tomato. It has been demonstrated in this work that mycorrhizal tomatoes have
a significantly lower level of disease severity than non-mycorrhizal plants. The
mechanism seems to be similar to ISR, which is also induced by associated
organisms in the roots and effective against necrotrophic pathogens.
It is well-known that P surplus hinders an optimal colonisation of host roots by
AMF. Therefore, a restricted P supply is advantageous if the mycorrhizal
protection method is exploited against Alternaria infection. Since mycorrhiza
itself ensures a sufficient P availability for the host plant, no P deficiency will
occur.
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