Ms. S.B. Ware: "Genetics of host-specific avirulence of Mycosphaerella graminicola on wheat"

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30 Oct 2006 13:30
Unit: Wageningen UR
Location: Aula, building 362, Gen. Foulkesweg 1, Wageningen
Organisation: Wageningen University
Promotor: prof.dr.ir. P.J.G.M. Wit de (Phytopathology)
Co Promotor: Dr.ir. G.H.J. Kema, Dr.ir. M. de Waard

 Mycosphaerella species are fungi that cause major economic losses in crops that include cereals, citrus fruits, and bananas, among others. Two organisms in this genus are the wheat pathogen Mycosphaerella graminicola (Fuckel) J. Schröt (anamorph Septoria tritici) and the barley pathogen Septoria passerinii.  M. graminicola has a very active sexual cycle, while no sexual cycle has been previously reported for S. passerinii.  This thesis includes studies on mating and genetics of both M. graminicola and S. passerinii.  We found that avirulent isolates of M. graminicola are able to survive and can complete sexual cycles on resistant cultivars to yield viable sexual progeny as long as the other parent is virulent.  The proven ability of avirulent isolates of M. graminicola to generate sexual progeny on resistant cultivars represents a new dynamic in population genetics that has not previously been considered in epidemiology. In addition, we report the discovery of an active sexual cycle for S. passerinii.
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