Abstract
THERE is no known pycnial stage in P. striiformis, and so it is impossible for new physiologic races to arise as a result of sexual recombination, the best known method in P. graminis1. Nevertheless, there are at least thirty known races on wheat alone in Europe and Asia2 and two new races, 2B and 8B, have appeared in Britain within the past 15 years3, and the epidemic in 1966 on the wheat variety Rothwell Perdix may well be caused by a further new race. Mutation and cytoplasmic change are possible causes of the production of new races, but it seemed to us that heterokaryosis4 or parasexual phenomena5 in the uredospore stage (both known in P. graminis) could be involved.
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LITTLE, R., MANNERS, J. Production of New Physiologic Races in Puccinia striiformis (Yellow Rust) by Heterokaryosis. Nature 213, 422 (1967). https://doi.org/10.1038/213422a0
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DOI: https://doi.org/10.1038/213422a0
