An international perspective on genetic structure and gene flow in Cercospora beticola populations

Knight, N. L. and Vaghefi, N. and Kikkert, J. and Bolton, M. D. and Secor, G. A. and Hanson, L. and Nelson, S. C. and Pethybridge, S. J. (2018) An international perspective on genetic structure and gene flow in Cercospora beticola populations. In: 2018 International Congress of Plant Pathology (ICPP 2018), 29 Jul - 3 Aug 2018, Boston, Massachusetts, United States.

Abstract

Cercospora leaf spot, caused by the fungus Cercospora beticola Sacc., is an important disease of Beta vulgaris L. (table beet, sugar beet, and Swiss chard) worldwide. Disease impacts include reductions in commodity grading, and quantity and quality of extractable sugars from sugar beet roots. Conidia of C. beticola disperse locally by water or wind to initiate and expand disease foci in fields. Mechanisms for long distance pathogen dispersal and epidemic initiation are largely unknown. Studies of populations from Western Europe, Iran, New Zealand, Turkey, and the USA reported high levels of genetic diversity. Moreover, in some populations, equal ratios of two mating types suggests an active, and potentially mobile, teleomorph. In Europe, long distance dispersal of C. beticola is implied by evidence of high levels of gene flow between isolates across the region, resulting in a single panmictic population. Furthermore, recurrent clonal lineages shared between the USA and Europe provided evidence for intercontinental genotype flow. The genetic relationships among C. beticola isolates from nine countries (Canada (n=37), Chile (n=28), Denmark (n=9), England (n=9), Germany (n=10), Italy (n=11), Sweden (n=8), Turkey (n=7), and four states in the USA (n=1073)) were assessed using 12 microsatellite markers. This information
will indicate the potential movement of C. beticola between regions and has implications for global disease management.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Poster)
Refereed: Yes
Item Status: Live Archive
Additional Information: Abstracts only published from Conference.
Faculty/School / Institute/Centre: Current - Institute for Life Sciences and the Environment - Centre for Crop Health
Date Deposited: 23 Apr 2019 07:22
Last Modified: 24 Jun 2019 03:43
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-108-10-S1.1
URI: http://eprints.usq.edu.au/id/eprint/36317

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