EXPANSION AND VARIABILITY OF THE PTR TOX A GENE IN POPULATIONS OF PYRENOPHORA TRITICI-REPENTIS AND PYRENOPHORA TERES

L. Leisova-Svobodova, A. Hanzalova, L. Kucera

Abstract


Ptr ToxA was the first proteinaceous, necrosis-inducing toxin identified and cloned from the wheat pathogen Pyrenophora tritici-repentis. It acts as a pathogenic factor and was transferred from another wheat pathogen, Stagonospora nodorum. No sequence variability of the Ptr ToxA gene was found within a P. tritici-repentis population, indicating its probable recent transfer into the genome. The Ptr ToxA gene was detected in isolates of Pyrenophora teres, predominantly a barley pathogen. A study on the presence of Ptr ToxA gene within a central European P. teres population is reported and its consequences are discussed.

Keywords


Pyrenophora teres; Pyrenophora tritici-repentis; Hordeum vulgare; Triticum aestivum; host-selective toxin; Ptr ToxA gene; horizontal gene transfer

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DOI: http://dx.doi.org/10.4454/jpp.v92i3.319

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EDIZIONI ETS, Pisa, Italy