Race structure of Pyrenophora tritici-repentis in Morocco

Published Date
May 10, 2017
Journal Article
Race structure of Pyrenophora tritici-repentis in Morocco
Fernanda M. Gamba
Filippo Maria Bassi, Maria R. Finckh

The virulence of 135 single-spore isolates of Pyrenophora tritici-repentis, collected from durum wheat fields representing most of the major agro-ecological zones of Morocco from 2013 to 2015, was assessed on six international differential wheat genotypes under controlled conditions. Races 1, 5, 6 and 7 were identified with races 5 and 6 being most frequent, representing 47% and 44% of isolates tested, respectively. Only eight isolates (6%) collected at two research stations and a farm field near a station in 2014 and 2015 were race 1, while three isolates collected in 2014 in a farm field in north-eastern Morocco were race 7. The uniform race structure in farm fields may be due to overreliance on a limited and narrow genetic base for durum wheat crops in Morocco. However, the identification of four races is significant since P. tritici-repentis can generate new combinations of virulence, thereby increasing race diversity. Combined with the low wheat diversity this may lead to future severe disease epidemics.

Fernanda M. Gamba, Filippo Bassi, Maria R. Finckh. (10/5/2017). Race structure of Pyrenophora tritici-repentis in Morocco. Phytopathologia Mediterranea, 56 (1), pp. 119-126.
durum (triticum durum)