GRRC annual report 2019 data
This report presents molecular genotyping and race typing results from the GRRC based on samples of rust infected wheat and triticale collected in 2018 and 2019 across four continents, i.e., Europe, Asia, Africa and South America.
The 2019 GRRC annual report covers genotyping and race phenotyping of yellow rust and stem rust samples from many regions of the world. The generation of this comprehensive data set was only possible with the impressive contribution of so many collaborators and supporters world-wide, who have assisted in collecting and submitting samples to GRRC in 2019. Find the list of contributers in the pdf version of the report.
Key highlights yellow rust
- Genetic group PstS11 was detected in Turkey and Uganda, so it is now prevalent in at least six countries in East Africa and the Middle East.
- A new genotype (and a unique race), first detected in Egypt (2018) and provisionally termed ME2018,was observed on both bread wheat and durum wheat in Turkey.
- At least two new races were detected in PstS10, the most prevalent genetic group in Europe. The new races were adapted to local, widely grown wheat varieties, and only detectable by including these varieties in the race testing.
- A new race with Yr10-virulence was detected in PstS13. Isolates of this genetic group has severely affected triticale (northern Europe), durum wheat (southern Europe) and bread wheat (South America).
- Genetic group PstS7 with the original Warrior race was less prevalent, but spreading to new areas,whereas PstS8 (with the Kranich race) was observed in few cases only.
- Additional groups were detected in several countries, e.g. PstS15 consisting of a single genotype and race, which was first observed in France and this year also in Denmark
Key highlights stem rust
- Clade III-B (TTRTF, the “Sicily race”), widespread in Italy since 2016, was detected in Spain, Tunisia and Iran.
- Clade IV-F, containing race TKKTF, was widespread in Europe, Africa and the Middle East, in total nine countries in this study.
- Clade I (Ug99) and associated races were not detected outside Africa except in Iran.
- Clade IV-B, containing the races TKTTF and TTTTF, was detected in Africa and southern Europe.
- Multiple races with unusual virulence combinations were observed on cereals in local areas in Sweden and Spain, where the alternate host, Berberis vulgaris, is present. High genetic diversity was confirmed by genotyping.
- Genotyping provided high-resolution results for genetic grouping of isolates, which to a large extent corresponded with race groups based on virulence phenotyping.
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