GRRC annual report 2020 data
This report presents molecular genotyping and race typing results from the GRRC based on samples of rust infected wheat and triticale collected in 2020 and across four continents, i.e., Europe, Asia, Africa and South America.
The 2020 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 2020. Find the list of contributers in the pdf version of the report.
Key highlights yellow rust
- Genetic group PstS11 dominating in East Africa and confirmed in eight countries in East Africa and the Middle East.
- First detection in Africa of a unique genotype previously observed in Pakistan and Afghanistan (2017-2018).
- A new group provisionally termed ME2018, detected in Egypt in 2018 and Turkey in 2019, was observed in Latvia in 2020.
- PstS10 is the most prevalent genetic group in Europe. Four races were detected in PstS10, each adapted to local, widely grown wheat varieties.
- Genetic group PstS13 variant carrying Yr10-virulence detected in Germany, first detected in Poland (2018). PstS13 has severely affected triticale and durum wheat (Europe) and bread wheat (South America and Australia).
- Genetic group PstS7 (Warrior race) and PstS8 (Kranich race) were less prevalent than in previous years. Up to now, PstS7 detected in Europe, northern Africa and South America, and PstS8 in Europe.
- Additional genetic groups were detected in low frequencies, including PstS15 (single genotype and race), present in France since 2017 and Scandinavia since 2019.
- Alignment experiments confirmed the presence of PstS10 and PstS13 in Australia
Key highlights stem rust
- Additional spread of stem rust in Europe, including France, Austria, Ireland and Norway.
- Clade III-B (race TTRTF), widespread in Sicily since 2016, has now been detected in seven countries in Europe and four countries in Africa/Asia. In 2020, first detection in Austria, Czech Republic, Slovakia, and Slovenia.
- Clade IV-F (race TKKTF) has been detected in 10 European countries (2019-2020), and previously in Egypt, Iran and Tunisia.
- Clade IV-B, (race TKTTF and TTTTF) has been detected in five countries in Europe and six countries in Africa. In 2020, TKTTF was detected in France, Ireland and Spain.
- Unusual races were observed in Czech Republic (RFCNC) and Denmark (QCHNC), the latter first detected in Sweden (2019).
- Clade I (Ug99) was detected in southern Iran (2019), but otherwise we did not observe this group outside East Africa.
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