Genetic diversity and structure in regional Cercospora beticola populations from Beta vulgaris ssp. vulgaris suggest two clusters of separate origin

Knight, Noel L. and Vaghefi, Niloofar and Kikkert, Julie R. and Bolton, Melvin D. and Secor, Gary A. and Rivera, Viviana V. and Hanson, Linda E. and Nelson, Scot C. and Pethybridge, Sarah J. (2019) Genetic diversity and structure in regional Cercospora beticola populations from Beta vulgaris ssp. vulgaris suggest two clusters of separate origin. Phytopathology, 109 (7). pp. 1280-1292. ISSN 0031-949X


Cercospora leaf spot, caused by Cercospora beticola, is a highly destructive disease of Beta vulgaris ssp. vulgaris worldwide. Cercospora beticola populations are usually characterized by high genetic diversity, but little is known of the relationships among populations from different production regions around the world. This information would be informative of population origin and potential pathways for pathogen movement. For the current study, the genetic diversity, differentiation, and relationships among 948 C. beticola isolates in 28 populations across eight geographic regions were investigated using 12 microsatellite markers. Genotypic diversity, as measured by Simpson’s complement index, ranged from 0.18 to 1.00, while pairwise index of differentiation values ranged from 0.02 to 0.42, with the greatest differentiation detected between two New York populations. In these populations, evidence for recent expansion was detected. Assessment of population structure identified two major clusters, the first associated with New York, and the second with Canada, Chile, Eurasia, Hawaii, Michigan, North Dakota, and one population from New York. Inferences of gene flow among these regions suggested the source for one cluster likely is Eurasia, whereas the source for the other cluster is not known. These results suggest a shared origin of C. beticola populations across regions, except for part of New York, where population divergence has occurred. These findings support the hypothesis that dispersal of C. beticola occurs over long distances.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to paper, in accordance with the copyright policy oft he publisher.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health
Date Deposited: 09 Jul 2019 04:20
Last Modified: 09 Jul 2019 04:36
Fields of Research : 07 Agricultural and Veterinary Sciences > 0706 Horticultural Production > 070603 Horticultural Crop Protection (Pests, Diseases and Weeds)
06 Biological Sciences > 0607 Plant Biology > 060704 Plant Pathology
06 Biological Sciences > 0604 Genetics > 060411 Population, Ecological and Evolutionary Genetics
Identification Number or DOI: 10.1094/PHYTO-07-18-0264-R

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