Author
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Deahl, Kenneth |
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Submitted to: International Congress of Plant Pathologists
Publication Type: Abstract Only Publication Acceptance Date: 1/30/2003 Publication Date: N/A Citation: N/A Interpretive Summary: Technical Abstract: The diversity of mitochondrial DNA (mDNA) was assessed within putative clonal and sexual populations of the late blight pathogen, Phytophthora infestans. Studying the mitochondrial genome provides new information about the evolution of this species, taking advantage of the fact that some regions of the genome are under more stringent selective pressure than others. Monosporangial P. infestans isolates (n=152) collected in 1990-2002 (characterized previously for mating type, metalaxyl sensitivity, alleles at the glucose-6-phosphate isomerase locus and RFLP bands detected by probe RG57) were analyzed for mtDNA haplotype. Strains were obtained from naturally-infected hosts including black, woody and hairy nightshade, potato (cultivated and wild Solanum species), tomato, tree tomato and pepino. Three mtDNA haplotypes were found in the United States Ia, IIa, IIb) on three different hosts. The results of the characterization of these isolates will be the focus of this study. Additional sampling may help to unravel historical and recent migrations as well as providing new insights into the forces shaping diversity in populations. |
