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Research Project: Genetics, Populations Dynamics, and Mycotoxin Prevention in Peanut

Location: National Peanut Research Laboratory

Title: Genetic polymorphism of Puccinia arachidis

item Arias De Ares, Renee

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 5/10/2013
Publication Date: 8/10/2013
Citation: Power, I.L., Arias De Ares, R.S., Culbreath, A.K. 2013. Genetic polymorphism of Puccinia arachidis. Phytopathology. 103(Suppl. 2):S2.115. APS-MSA Joint Meeting. Austin, Texas. August 10–14, 2013

Interpretive Summary: None required.

Technical Abstract: Puccinia arachidis Speg is the causal agent of peanut rust, an important foliar disease of peanut (Arachis hypogaea) in mainly low input peanut producing countries with warm, tropical climates. Management of this disease in these countries is best realized through host resistance. Knowledge on the variability of the P. arachidis populations is useful to effectively breed for stable resistance and thus effective management of the peanut rust disease on the long run, however, little is known about the population structure of P. arachidis. Our objective was to determine the genetic diversity of P. arachidis. We evaluated sequences of the 5.8S-ITS2-28S region of P. arachidis isolates, collected from different regions in North America, South America, Central America and Asia, from 2010 to 2012. Preliminary results from the sequenced ITS region of the P. arachidis isolates indicate high genetic homogeneity among the populations studied as there was no clustering of isolates by geographic origin. Analysis of more isolates from different geographic areas and of more loci is needed to determine the population structure of P. arachidis. These results will be presented and discussed.