Temporal genetic differentiation of Cercospora beticola populations in New York Table beet fields
Article
Article Title | Temporal genetic differentiation of Cercospora beticola populations in New York Table beet fields |
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ERA Journal ID | 2647 |
Article Category | Article |
Authors | Knight, Noel L. (Author), Vaghefi, Niloofar (Author), Hansen, Zachariah R. (Author), Kikkert, Julie R. (Author) and Pethybridge, Sarah J. (Author) |
Journal Title | Plant Disease: an international journal of applied plant pathology |
Journal Citation | 102 (11), pp. 2074-2082 |
Number of Pages | 9 |
Year | 2018 |
Publisher | American Phytopathological Society |
Place of Publication | St Paul, MN, United States |
ISSN | 0191-2917 |
1943-7692 | |
Digital Object Identifier (DOI) | https://doi.org/10.1094/PDIS-01-18-0175-RE |
Abstract | Annual epidemics of Cercospora leaf spot (CLS), caused by the fungus Cercospora beticola, can result in substantial defoliation in table beet fields in New York. High allelic and genotypic diversity have been described within C. beticola populations; however, information on the temporal stability of populations is lacking. C. beticola isolates were obtained from symptomatic leaves in three table beet fields in successive years. Two of the fields were organic mixed-cropping farms and the third was managed conventionally in a broad-acre cropping system. C. beticola isolates (n = 304) were genotyped using 12 microsatellite markers. Genotypic diversity (Simpson's complement index = 0.178 to 0.990), allele frequencies, and indices of differentiation between years varied. Pairwise index of differentiation values ranged from 0.02 to 0.25 for clone-corrected data, and indicated significant genetic differentiation at Farm 2. No multilocus genotype was shared between years. The shift in multilocus genotypes between years questions the role of clonally reproducing primary inoculum. Collectively, these results suggest that a dominant inoculum source for initiating annual CLS epidemics is external to the field of interest. These findings have implications for CLS disease management in conventional and organic table beet production. |
Keywords | sugar beet; Cercospora beticola; C beticola |
ANZSRC Field of Research 2020 | 310805. Plant pathology |
310599. Genetics not elsewhere classified | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Cornell University, United States |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5295/temporal-genetic-differentiation-of-cercospora-beticola-populations-in-new-york-table-beet-fields
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