Screening for resistance to septoria tritici blotch, the major wheat disease in western Europe

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Abstract

Septoria tritici leaf blotch (STB) caused by Mycospharella graminicola is one of the most devastating wheat diseases in Europe and it is estimated that approximately 600 M€ is annually spent on the chemical control of this disease. France is one of the main wheat producers (6% of the total global production) and STB is the primary constraint. One of the most efficient and environmentally friendly ways to control STB is to breed resistant cultivars and in recent years 15 major resistance genes (Stb1-Stb15) were identified. We evaluated 104 cultivars, including a 13 cultivar as differential set representing 15 mapped Stb genes and cv.Taichung 29 as susceptible check, with 54 M. graminicola isolates in three independent replicated trials using first leaf pycnidia coverage at 21 days after inoculation as the prime disease parameter. None of the Stb genes is effective to all M. graminicola isolates. However CS Synthetic (6x), carrying Stb5, is the most effective gene against French isolates. Moreover, TE9111, carrying Stb11 and Stb7, and Arina, which has Stb15 and Stb6 are the most resistance lines and cultivar of the differential set, after examination with 18 M. graminicola bread wheat isolates that represent a global range of pathogenicity. Interestingly, only one newly developed synthetic hexaploid show specific resistant to all highly virulent French isolates as well as the aformenetioned ‘global’ suite of M. graminicola isolates that compromise the majority of the available Stb genes. Exploitation of this M. graminicola collection representing a broad range of virulence factors on wheat germplasm and Stb differential cultivars helped us to identify and characterize potentially new sources of resistance to STB. These will be used in mapping and QTL studies in several DH and RIL populations for marker development to support rapid and efficient deployment in practical breeding programs. http://www.path.ethz.ch/news/conferences/Mycosphaerella_Ascona_2007/program2
Original languageEnglish
Publication statusPublished - 2008
Event7th International Mycosphaerella and Stagonospora Symposium - Ascona, Switzerland
Duration: 18 Aug 200822 Aug 2008

Conference

Conference7th International Mycosphaerella and Stagonospora Symposium
CountrySwitzerland
CityAscona
Period18/08/0822/08/08

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