Arable
Yellow rust diversity leads to new race-naming system
E
xtreme diversity in the wheat yellow rust popu- lation has led to the intro- duction of a new naming system for races of the disease discovered in the UK.
A new race has been named WYR Blue 7 under the new sys- tem – replacing its provisional name Invicta. Its discovery in the UK last year is just one of several yellow rust population changes at a time which has also seen rad- ical revisions to the AHDB Rec- ommended List.
Project manager Sarah Hold-
gate described the new naming system at the annual UK Cere- al Pathogen Virulence Survey (UKCPVS) stakeholder event, held earlier this spring at the NIAB Innovation Farm in Cam- bridgeshire.
“Last year was far from straightforward from a yellow
rust perspective,” she said. “By mid-March 2016, we had received a record number of infected sam- ples from wheat crops. It was a sign that something big was hap- pening and the season ended with major revisions to RL ratings.
“
Last year was far from straightforward, from a yellow rust perspective
Dr Holdgate added: “Although we are still looking to pin down the race or races responsible for the breakdown, our monitoring has detected new races in the UK population and we are keeping an eye on them.” The new race, which was pro- visionally named Invicta, ap- peared similar to old UK isolates,
such as the Solstice race, based on its ability to cause disease. Subsequent genotyping, how- ever, showed that the race had more in common with the War- rior population.
Complex Dr Holdgate continued: “Until now, naming a race based on the variety on which it was fi rst de- tected has served us well. But the system no longer copes with the complex genotypic and pathology data we are seeing and we feel it is important to avoid using a va- riety’s name.” For wheat yellow rust, the
Monitoring has detected new yellow rust races in the UK, says Sarah Holdgate
Warrior race continues to dom- inate samples, with the Warri- or 4 group found in at least half of samples tested by UKCPVS. After a period of decline, Warri- or 1 increased in 2016. Virulence frequencies for most genes remained relatively stable in 2016. However, the YR7 gene was more prevalent, as was the YR8 gene – which is an indicator of the Kranich race – although it remains relatively rare.
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