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Phytopathology

Title:		Investigating the genetic structure of Phytophthora capsici populations
Author(s):		Quesada-Ocampo LM; Granke LL; Mercier MR; Olsen J; Hausbeck MK;
Address:		"Department of Plant Pathology, Michigan State University, East Lansing, MI, USA"
Journal Title:		Phytopathology
Year:		2011
Volume:		101
Issue:		9
Page Number:		1061 - 1073
DOI:		10.1094/PHYTO-11-10-0325
ISSN/ISBN:		0031-949X (Print) 0031-949X (Linking)
Abstract:		"Phytophthora capsici Leonian is a destructive soilborne pathogen that infects economically important solanaceous, cucurbitaceous, fabaceous, and other crops in the United States and worldwide. The objective of this study was to investigate the genetic structure of 255 P. capsici isolates assigned to predefined host, geographical, mefenoxam-sensitivity, and mating-type categories. Isolates from six continents, 21 countries, 19 U.S. states, and 26 host species were genotyped for four mitochondrial and six nuclear loci. Bayesian clustering revealed some population structure by host, geographic origin, and mefenoxam sensitivity, with some clusters occurring more or less frequently in particular categories. Bayesian clustering, split networks, and statistical parsimony genealogies also detected the presence of non-P. capsici individuals in our sample corresponding to P. tropicalis (n = 9) and isolates of a distinct cluster closely related to P. capsici and P. tropicalis (n = 10). Our findings of genetic structuring in P. capsici populations highlight the importance of including isolates from all detected clusters that represent the genetic variation in P. capsici for development of diagnostic tools, fungicides, and host resistance. The population structure detected will also impact the design and interpretation of association studies in P. capsici. This study provides an initial map of global population structure of P. capsici but continued genotyping of isolates will be necessary to expand our knowledge of genetic variation in this important plant pathogen"
Keywords:		"Alanine/analogs & derivatives/pharmacology Base Sequence Bayes Theorem Cell Nucleus/genetics Cluster Analysis DNA, Mitochondrial/chemistry/genetics Genetic Markers Genetic Structures/*genetics Genetic Variation Genotype Haplotypes Host Specificity Mating;"
Notes:		"MedlineQuesada-Ocampo, L M Granke, L L Mercier, M R Olsen, J Hausbeck, M K eng 2011/04/14 Phytopathology. 2011 Sep; 101(9):1061-73. doi: 10.1094/PHYTO-11-10-0325"