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Secondary hosts as potential inoculum source for rice blast pathogen in Argentina

Abstract
Rice Blast is the main disease of this crop in Argentina. It occurs sporadically at different rice growing areas, mainly in Santa Fe and Chaco provinces. However, when environmental conditions are favorable to disease development, Rice Blast can cause damages in other rice growing areas, such as Entre Ríos or Corrientes provinces. Inoculum survival and pathogen population specificity are important issues to understand Rice Blast epidemiology. [ver mas...]
Rice Blast is the main disease of this crop in Argentina. It occurs sporadically at different rice growing areas, mainly in Santa Fe and Chaco provinces. However, when environmental conditions are favorable to disease development, Rice Blast can cause damages in other rice growing areas, such as Entre Ríos or Corrientes provinces. Inoculum survival and pathogen population specificity are important issues to understand Rice Blast epidemiology. Pyricularia grisea isolates from Phalaris canariensis, Stenotaphrum secundatum, Lolium perenneand Digitaria sanguinalis were collected in Entre Ríos fields in 2007. Greenhouse assays were performed. The isolates were artificially inoculated to rice genotypes, including differential lines with resistant genes Pi1, Pi2, Pita or Pi33; and commercial varieties as Cambá INTA-Proarroz, Puitá INTA-CL, or Supremo-13. Re-isolations of the pathogen from foliar symptoms were done. Any contamination was prevented. All isolates caused typical Rice Blast foliar symptoms in different rice genotypes. Differential line with Pi2showed symptoms with all the isolates evaluated. The other genotypes showed susceptible or no reactions, according to the isolate. Molecular characterization of original and re-isolated strains will be done. This work enhances the study of secondary hosts´ potential role in Rice Blast epidemiology in Argentina. [Cerrar]
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Author
Pedraza, Maria Virginia;   Liberman, Claudia Alejandra;   Nuñez Bordoy, Evangelina;   Asselborn, Miriam;  
Descripción
Póster
Fuente
6th International Rice Blast Conference (IRBC), Jeju, South Korea, August 20-24, 2013
Date
2013-08
URI
http://hdl.handle.net/20.500.12123/9378
Formato
pdf
Tipo de documento
documento de conferencia
Palabras Claves
Arroz; Rice; Oryza Sativa; Enfermedades de las Plantas; Plant Diseases; Hosts; Huéspedes; Inoculation; Inoculación; Blasts (of plants); Pyricularia Oryzae; Resistance Varieties; Argentina; Virulence; Virulencia; Rice Blast Disease;
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Excepto donde se diga explicitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
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