Phylogenetic analysis of a population of Fusarium solani associated with peanut brown root rot in Argentina.

REYNOSO M.M.; CASASNOVAS, F.; CHULZE, S,N,; LESLIE, J.F.; TORRES, A.M

Alghero, Italia

Workshop; 10th International Fusarium Workshop and Fusarium Genomics Workshop 2008; 2008

Peanut (Arachis hypogaea L.) is a major cultivated crop in Argentina, with production reaching almost 300,000 tons during 2005/2006 harvest season. Virtually all (98%) of these peanuts were produced in Cordoba Province. Peanut brown root rot was first described in Argentina in 1992. The disease kills adult plants and is accompanied by significant economic losses. The disease is most important in seasons with long drought-stress periods with 95% disease incidence observed in some fields. The etiological agent was first reported as Fusarium solani (Mart.) Appel. and Wollenw. Snyd. et Hans., but the pathogen has not yet been well described. Strains in the Fusarium solani species complex isolated from peanut plants with brown root rot symptoms were evaluated by sequencing the nuclear ribosomal internal transcribed spacer (ITS) region, a portion of the translation elongation factor 1-- gene (EF-L), and a portion of the ~-tubulin gene. Two clades were identified based on DNA sequence similarity amongst the peanut-