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Virulence of Pyrenophora tritici-repentis: a minireview
Author(s) -
Jānis Kaņeps,
AUTHOR_ID,
B. Bankina,
Inga MoročkoBičevska,
AUTHOR_ID
Publication year - 2021
Publication title -
research for rural development/research for rural development (online)
Language(s) - English
Resource type - Conference proceedings
eISSN - 2255-923X
pISSN - 1691-4031
DOI - 10.22616/rrd.27.2021.003
Subject(s) - pyrenophora , chlorosis , biology , virulence , gene , genetics , genotype , pathogen , population , microbiology and biotechnology , botany , medicine , environmental health
Pyrenophora tritici-repentis is a major wheat pathogen in all wheat (Triticum spp.) growing areas worldwide. Up to date, eight P. tritici-repentis races have been described based on chlorosis, necrosis, or both symptoms caused on race differential wheat genotypes: ‘Glenlea’, 6B662, 6B365, and ‘Salamouni’. Symptom development on differential genotypes depends on the interaction of the pathogen’s necrotrophic effectors named Ptr ToxA, Ptr ToxB, and Ptr ToxC with host susceptibility genes. Ptr ToxA is encoded by the single copy gene ToxA and induces necrosis on sensitive wheat cultivars. Ptr ToxB causes chlorosis and is encoded by the multicopy gene ToxB. The Ptr ToxC is the non-proteinaceous, polar, low molecular mass molecule that also induces chlorosis, but up to date, the gene encoding this toxin is unknown. Races producing Ptr ToxA are predominant in the global Ptr population. There are several reports about new putative races of P. tritici-repentis that do not conform with the current race system, so further research is required. This study aims to collect and systematise available information about the virulence and races of P. tritici-repentis.

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