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| DOI: | 10.1094/PDIS-93-10-1044 |
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| Web URL(s): | http://apsjournals.apsnet.org/doi/pdf/10.1094/PDIS-93-10-1044
Last checked: 09/11/2009
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Ma, B.;
Uddin, W. |
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| Author Affiliation: | Department of Plant Pathology, Pennsylvania State University, University Park, Penssylvania |
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| Title: | Fitness and competitive ability of an azoxystrobin-resistant G143A mutant of Magnaporthe oryzae from perennial ryegrass |
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| Section: | Research
Other records with the "Research" Section
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| Source: | Plant Disease. Vol. 93, No. 10, October 2009, p. 1044-1049. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 6 |
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| Keywords: | TIC Keywords: Azoxystrobin; Competitive ability; Herbicide resistance; Lolium perenne; Pyricularia grisea
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| Abstract/Contents: | "Development of azoxystrobin resistance in Magnaporthe oryzae from perennial ryegrass has been reported in certain locations in the United States, and possible development of resistance in additional areas is a major concern in the golf course industry. The study was undertaken to evaluate the relative fitness and competitive ability of a field-collected azoxystrobin-resistant G143A mutant by comparing it with a wild-type strain using detached perennial ryegrass blades. A fitness comparison experiment indicated that the disease severity of the wild-type strain was significantly higher than that of the mutant; however, the mutant produced greater secondary inoculum. When inoculated with three mixed populations of resistant and wild-type strains at different ratios, the production of conidia by the wild-type strain increased and that of the mutant decreased after infection occurred in all three populations tested. In an experiment on the effect of various fungicides on the population initially containing 5% of the mutant, preventive application of azoxystrobin allowed 5% of the mutant to dominate the population after the infection. However, other non-quinone outside inhibitor fungicides and mixtures of azoxystrobin with contact fungicides eliminated the entire mutant. This study demonstrates that the wild-type strain of M. oryzae has a competitive advantage over the mutant within the environment tested. Mixtures and alternations of fungicides with different modes of actions may prevent rapid build-up of resistance in the gray leaf spot pathosystem." |
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| Language: | English |
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| References: | 33 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ma, B., and W. Uddin. 2009. Fitness and competitive ability of an azoxystrobin-resistant G143A mutant of Magnaporthe oryzae from perennial ryegrass. Plant Dis. 93(10):p. 1044-1049. |
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| DOI: 10.1094/PDIS-93-10-1044 |
| Web URL(s):
http://apsjournals.apsnet.org/doi/pdf/10.1094/PDIS-93-10-1044
Last checked: 09/11/2009
Requires: PDF Reader |
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MSU catalog number: b2194824a |
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