Molecular characterization of a Latin American Pyricularia grisea population
2002
Livore, A.B. | Dezar, C. | Plata, M.I. | Avila, S. | Levy, M.
Irrigated rice in the Southern Cone of Latin America is grown in southern Brazil, Argentina, and Uruguay. Although rice blast has been present in that region for a long time, it became a major constraint to rice production starting in 1996. The MGR586 probe was used to generate DNA fingerprints (EcoRI-RFLPs, restricted fragment length polymorphism) from monoconidial isolates of Pyricularia grisea collected in southern Brazil, Argentina and Uruguay from cultivars and breeding lines during the rice seasons of 1994, 1997, and 1998. A total of five different MGR-fingerprint lineages have been found in this region, but only one has been isolated on the tropical cultivars that are the most extensively grown. Even in breeding nurseries where other different isolates have been identified, the DNA fingerprints of isolates on tropical cultivars consistently belong to the same lineage. This suggests a specific susceptibility of those cultivars to that particular fungal lineage but, at the same time, also suggests resistance to the other lineages found in the region.
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