these root-fungus associations also stimulate plant defensive
mechanisms. Strains of Trichoderma added to the rhizosphere
protect plants against numerous classes of pathogens,
e.g. those that produce aerial infections, including viral, bacterial
and fungal pathogens, which points to the induction of
resistance mechanisms similar to the hypersensitive response
(HR), systemic acquired resistance (SAR), and induced systemic
resistance (ISR) in plants