Features of the relationship between the parasite and the host in the pathosystem “Triticum aestivum – Pyrenophora tritici-repentis”

Tan spot is a widespread disease of wheat, belongs to the group of dangerous, causes yield losses and worsens grain quality. The causative agent of the disease is the ascomycete fungus Pyrenophora tritici-repentis. In the last three decades, genetic mechanisms of relationships in the pathosystem “Triticum aestivum – Pyrenophora tritici-repentis” have been actively studied. The interaction of the parasite and host plant genes occurs according to the inverse type, in contrast to the classical concept, proposed by Flor. The known data on the genetics of soft wheat resistance to the causative agent of tan spot and examples of interactions of wheat susceptibility genes with the main pathogenicity factors of P. tritici-repentis are presented. The complexity of the pathosystem “Triticum aestivum – Pyrenophora tritici-repentis” is noted, which includes not only race-specific interactions determined by fungal NEs and host susceptibility genes, but also many QTLs associated with resistance to several races.