Short communication: Emergence of a new race of leaf rust with combined virulence to Lr14a and Lr72 genes on durum wheat
Visualitza/Obre
Autor/a
Soleiman, Nour H.
Solis, Ignacio
Soliman, Mahmoud H.
Sillero, Josefa C.
Alvaro, Fanny
Serra, Joan
Ammar, Karim
Martinez-Moreno, Fernando
Data de publicació
2016-08-31ISSN
2171-9292
Resum
Leaf rust is a foliar disease caused by the fungus Puccinia triticina that may severely reduce durum wheat yield. Resistance to this pathogen is common in modern durum germplasm but is frequently based on Lr72 and Lr14a. After accounts of races with virulence to Lr14a gene in France in 2000, the present study reports the detection in 2013 for the first time of a new race with virulence to Lr14a and Lr72. The aim of this work was to characterize the virulence pattern of four Spanish isolates with virulence to Lr14a, and to discuss the consequences of this presence. Rusted leaves from cultivars ‘Don Jaime’ (Lr14a) and ‘Gallareta’ (Lr72) were collected in 2013 in the field at two Spanish sites, one in the south (near Cadiz) and another in the north (near Girona). Spores from single pustule for each cultivar and site were multiplied on susceptible cultivar ‘Don Rafael’. Then, the four isolates were inoculated on a set of 19 isogenic lines Thatcher to characterize their virulence spectrum. All isolates presented the same virulence
pattern. They were virulent on both Lr14a and Lr72 and the race was named DBB/BS. This race was very similar to those reported in 2009-11, but with added virulence to Lr14a. The resistance based on Lr14a has therefore been overcome in Spain, by a new race that has likely emerged via stepwise mutation from the local predominating races. This information is important to guide breeders in their breeding programmes and gene deployment strategies.
Tipus de document
Article
Versió del document
Versió publicada
Llengua
Anglès
Matèries (CDU)
633 - Cultius i produccions
Pàgines
4
Publicat per
Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA)
Publicat a
Spanish Journal of Agricultural Research
Citació
Soleiman, Nour H., Ignacio Solis, Mahmoud H. Soliman, Josefa C. Sillero, Dolors Villegas, Fanny Alvaro, Conxita Royo, Joan Serra, Karim Ammar, and Fernando Martínez-Moreno. 2016. "Short Communication: Emergence Of A New Race Of Leaf Rust With Combined Virulence To Lr14a And Lr72 Genes On Durum Wheat". Spanish Journal Of Agricultural Research 14 (3): e10SC02. doi:10.5424/sjar/2016143-9184.
Programa
Cultius Extensius Sostenibles
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