Molecular Characterization of Australian Isolates of Puccinia graminis f. sp. tritici Supports Long-Term Clonality but also Reveals Cryptic Genetic Variation

Phytopathology
Jianping ZhangR F Park

Abstract

Long-term surveys of pathogenicity in Puccinia graminis f. sp. tritici in Australia have implicated mutation as a major source of virulence, at times leading to the demise of stem-rust-resistant wheat cultivars and substantial yield losses. Since 1925, these surveys have identified at least four occasions on which exotic isolates of P. graminis f. sp. tritici appeared in Australia, with each acting as a founding isolate that gave rise sequentially to derivative pathotypes via presumed single-step mutation. The current study examined the relationship between virulence and molecular patterns using simple-sequence repeat (SSR) markers on selected isolates of P. graminis f. sp. tritici collected in Australia during a 52-year period in order to propose an evolutionary pathway involving these isolates. Studies of SSR variability among this collection of isolates within a putative clonal lineage based on pathotype 21-0, first detected in 1954 (the "21/34 lineage"), provided compelling evidence of clonality over the 52-year period, coupled with single-step acquisition of virulence for resistance genes. It also supported the postulation that two triticale-attacking pathotypes (34-2,12 and 34-2,12,13) detected in the early 1980s were der...Continue Reading

References

Jul 30, 2003·Mycological Research·Felicity J KeiperColin R Wellings
Oct 19, 2004·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Daryl J SomersKeith Edwards
Jan 19, 2005·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Q J SongP B Cregan
Feb 25, 2009·Molecular Plant Pathology·Botma VisserZacharias A Pretorius
Aug 28, 2012·Annual Review of Phytopathology·Robert F Park, Colin R Wellings

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