Arbuscular mycorrhiza increased the activity of a biotrophic leaf pathogen – is a compensation possible?

By H. Gernns, H. Alten, H. Poehling. Mycorrhiza, 2001

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Impact of Arbuscular Mycorrhizal Symbiosis on Plant Response to Biotic Stress: The Role of Plant Defence Mechanisms (2010, background): “Biotrophic pathogens, such as powdery mildew and rust fungi (Blumeria, Oidium, Uromyces) seem to perform better in mycorrhizal plants, although increased tolerance was often observed in terms of plant mass and yield (Gernns et al. 2001; Whipps 2004).”
Root colonization by Piriformospora indica enhances grain yield in barley under diverse nutrient regimes by accelerating plant development (2010, background): “Increased grain yield could therefore –at least in part- result from an increased biotic stress resistance, as observed for some, but not all, pathogens in AM colonized plants (Dehne 1982; Cordier et al. 1998; Gernns et al. 2001; Pozo et al. 2002).”
Interactions Between Plant Growth Promoting Fungi and Arbuscular Mycorrhizal Fungus Glomus Mosseae and Induction of Systemic Resistance to Anthracnose Disease in Cucumber (2006, background): “However, weak and transient activation of plant defense responses that occurred locally in most cases have also been observed when the AM symbiotic interaction began to establish (Gadkar et al. 2001; Garcia-Garrido and Ocampo 2002 ).”