Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Migration and Selection Enforced Multiple Phenotypic and Genotypic Changes in the Population of Phytophthora infestans in Israel during the Last 36-Year Period

Version 1 : Received: 25 January 2020 / Approved: 27 January 2020 / Online: 27 January 2020 (07:28:44 CET)

How to cite: Cohen, Y.; Rubin, A.E.; Galperin, M.; Shamaba, E.; Zig, U.; Cooke, D.E.L. Migration and Selection Enforced Multiple Phenotypic and Genotypic Changes in the Population of Phytophthora infestans in Israel during the Last 36-Year Period. Preprints 2020, 2020010321 (doi: 10.20944/preprints202001.0321.v1). Cohen, Y.; Rubin, A.E.; Galperin, M.; Shamaba, E.; Zig, U.; Cooke, D.E.L. Migration and Selection Enforced Multiple Phenotypic and Genotypic Changes in the Population of Phytophthora infestans in Israel during the Last 36-Year Period. Preprints 2020, 2020010321 (doi: 10.20944/preprints202001.0321.v1).

Abstract

Late blight caused by the oomycete pathogen Phytophthora infestans is a devastating disease of potato and tomato worldwide, including Israel. The population structure of this pathogen was monitored in potato and tomato fields in Israel during a 36-year period of 1983-2019. Isolates of the pathogen were tested for sensitivity to phenylamide fungicides, mating type, race structure, and genotype. The phenotypic and genotypic structure of the population from potato have changed greatly from one year to another, from one season to the next, within a season and within a single field. Major changes also occurred in the population collected from tomato crops. The mechanisms driving these multiple changes and the heterogeneous nature of the population in Israel are shown to derive from multiple migration events of the pathogen via seed tubers from Europe and from fitness-driven selection processes.

Subject Areas

late blight; mating type; mefenoxam; metalaxyl; potato; SSR genotyping; race structure; tomato

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