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| Web URL(s): | http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2001.91.6.S101#page=10
Last checked: 10/16/2015
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Farman, M. L. |
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| Author Affiliation: | Department of Plant Pathology, University of Kentucky, Lexington, KY |
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| Title: | The molecular basis of field resistance to QoI fungicides in Pyricularia grisea |
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| Meeting Info.: | 2001 APS/MSA/SON Joint Meeting, Salt Lake City, Utah: August 25-29, 2001 |
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| Source: | Phytopathology. Vol. 91, No. 6, June Supplement 2001, p. S110. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Fungicide resistance; Strobilurin fungicides; Pyricularia grisea; Gray leaf spot; Lolium perenne; Disease control; Mutations
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| Abstract/Contents: | "Gray leaf spot (gls) of perennial ryegrass caused by Pyricularia grisea has rapidly become one of the most destructive turfgrass diseases. Control of gls is dependent on the use of preventative fungicide treatments. Strobilurin-based (QoI) fungicides, which inhibit the mitochondrial enzyme cytochrome b, have proven very effective against gls. However, in 2000, QoI fungicide resistance was found in P. grisea on 2 golf courses in the USA - one in Lexington, KY and the other in Bloomington, IL. Nucleotide sequence analysis of the cytochrome b gene (CYTB) in a number of isolates from affected turf, revealed two mutant cytB alleles, each carrying a single point mutation. The first mutation causes an G143A alteration in the peptide sequence, while the other results in a F129L change. These substitutions have previously been associated with QoI fungicide resistance in Venturia inaequalis and Saccharomyces cerevisiae. In P. grisea, mutants possessing the G143 A substitution had ~10 fold higher levels of resistance than those with F129L. DNA fingerprint analysis of several resistant P. grisea isolates found on a single QoI fungicide-treated golf course revealed that they were genetically distinct. Therefore, the widespread occurrence of disease on this course was not caused by dispersal of a single resistant clone." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Farman, M. L. 2001. The molecular basis of field resistance to QoI fungicides in Pyricularia grisea. Phytopathology. 91(6):p. S110. |
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| Web URL(s):
http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2001.91.6.S101#page=10
Last checked: 10/16/2015
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 599 .P48 |
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