An Allele-specific PCR Assay for Detecting Azoxystrobin-resistant Alternaria Isolates from Pistachio in California |
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Authors: | Z Ma T J Michailides |
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Institution: | Authors' address: Department of Plant Pathology, University of California, Davis, Kearney Agricultural Center, 9240 South Riverbend Ave., Parlier, CA 93648, USA (correspondence to T. J. Michailides. E-mail: ) |
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Abstract: | Alternaria late blight caused by Alternaria spp. in the alternata, tenuissima and arborescens species‐groups is one of the most common fungal diseases of pistachio in California. A single point mutation resulting in the replacement of a glycine by an alanine at codon 143 (G143A) in the mitochondrial cytochrome b (cyt b) has been found in all azoxystrobin‐resistant isolates of these three species from California pistachio. In this study, a pair of allele‐specific polymerase chain reaction (PCR) primers was developed to detect this point mutation. The allele‐specific PCR assay coupled with a rapid DNA extraction method could detect azoxystrobin‐resistant Alternaria isolates in a few hours. The allele‐specific PCR method was also reliable for detecting azoxystrobin‐resistant Alternaria directly in both laboratory‐inoculated and naturally infected pistachio leaves. |
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Keywords: | allele-specific polymerase chain reaction Alternaria late blight of pistachio azoxystrobin QoI fungicides |
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