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Race structure and distribution of Pyrenophora tritici-repentis in Tunisia

Author: Laribi, M.
Author: Gamba, F. M.
Author: Hassine, M.
Author: Singh, P.K.
Author: Yahyaoui, A.H.
Author: Sassi, K.
Year: 2019
ISSN: 0031-9465 (Print)
URI: https://hdl.handle.net/10883/20655
Format: PDF
Language: English
Publisher: Universitá Degli Studi Firenze
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Article
Place of Publication: Italy
Pages: 473-483
Issue: 3
Volume: 58
DOI: 10.14601/Phyto-10892
Description: Tan spot, caused by Pyrenophora tritici-repentis (Ptr), is a widespread foliar disease of wheat, which is becoming important in North Africa particularly in Tunisia. To assess the pathogenic variation of Ptr in Tunisia, characterized 84 single conidium isolates of Ptr were characterized from durum wheat cultivars, sampled during the 2017-2018 cropping season. The virulence of isolates were assessed, under controlled conditions, on a standard differential set of six wheat genotypes. Ptr races 2, 4, 5, 6, 7 and 8 were identified, the first such information available for Tunisia. Race 2, commonly found in North America, South America and Asia, was identified for the first time in North Africa, at a low frequency of 5%. Races 5 and 7 were the most frequent, representing, respectively, 39% and 43% of the isolates tested. Only 8% of the isolates were classified as race 8, while 4% were identified race 6. Race 6 was only detected at the experimental station in the North Western region of Tunisia and in a nearby farm field. Only one Ptr isolate was avirulent on all six differential genotypes, and was therefore designated race 4. The identification of six races of Ptr on durum wheat demonstrates the high diversity of the pathogen population in Tunisia.
Country of Focus: TUNISIA
Agrovoc: PHYSIOLOGICAL RACES
Agrovoc: PYRENOPHORA TRITICI REPENTIS
Agrovoc: HARD WHEAT
Agrovoc: PLANT DISEASES
Journal: Phytopathologia Mediterranea


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  • Wheat
    Wheat - breeding, phytopathology, physiology, quality, biotech

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