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Specialization of crown rust puccinia coronata on clones of italian rye grass lolium multiflorum



Specialization of crown rust puccinia coronata on clones of italian rye grass lolium multiflorum



Euphytica 27(3): 837-842



Cultures of P. coronata from a mixed uredospore population obtained from plants in 16 localities in England and Wales [UK] were multiplied on 4 of 10 initially resistant clones of L. multiflorum. Only 2 of the 4 cultures were most pathogenic on the clones on which they had been multiplied. One clone became very susceptible to its own culture but the other became only moderately susceptible. Clone/culture interactions occurred which were not obviously related to the clone of origin of the culture. Thus, there was considerable genetic diversity in the crop which would tend to limit the multiplication of new races. There was a strong correlation between visual score for susceptibility and uredospore production, showing the value of visual scores for resistance breeding.

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