Mutation to wider virulence in Puccinia graminis f. sp. tritici: evidence for the existence of loci which allow the fungus to overcome several host stem rust resistance genes simultaneously
Mutants of Puccinia graminis f. sp. tritici were obtained which were able to overcome simultaneously several host stem rust resistance (Sr) genes effective against the wild-type culture. These results suggest that, in addition to those Psr loci which relate specifically to host Sr genes in a "g...
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Published in | Applied and Environmental Microbiology Vol. 57; no. 8; pp. 2332 - 2336 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
United States
American Society for Microbiology
01.08.1991
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Subjects | |
Online Access | Get full text |
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Summary: | Mutants of Puccinia graminis f. sp. tritici were obtained which were able to overcome simultaneously several host stem rust resistance (Sr) genes effective against the wild-type culture. These results suggest that, in addition to those Psr loci which relate specifically to host Sr genes in a "gene for gene" manner, one or more general loci may be present in this pathogen. The product(s) of these general genes may be necessary for the expression of various host Sr genes. The evolution of a super race capable of overcoming many Sr genes for resistance seems likely, as such a pathogen would not have to give up the many proteins predicted by the gene-for-gene relationship. Moreover, it appears that specificity in the wheat rust system is more complicated than suggested by the gene-for-gene concept |
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Bibliography: | 9160119 H20 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 This work is dedicated to the memory of my mentor, coauthor, and friend, William Q. Loegering, who passed away on 15 December 1987. Corresponding author. |
ISSN: | 0099-2240 1098-5336 |
DOI: | 10.1128/aem.57.8.2332-2336.1991 |