Abstract

FLOREZ ZAPATA, Nathalia María Vanesa  and  VELEZ, Daniel. Determination of the Infeccion of Burkholderia glumae in Comercial Colombian Rice Varieties. Rev. Fac. Nac. Agron. Medellín [online]. 2011, vol.64, n.2, pp.6093-6104. ISSN 0304-2847.

The bacterial panicle blight of rice caused by Burkholderia glumae, is a disease that has gained increasing distribution in Colombia. Therefore it is important to implement an assessment system of infection of this phytopathogen in seeds, since this is one of the possible disease sources on the field. Thus, previously disinfected seeds were dipped in the bacterial suspension and placed in a moist chamber for 7 days, after which they were assessed. This assessment system, was validated by analyzing the infection severity level on seven rice varieties and three concentrations of the pathogen. The analysis revealed that varieties F60, Panorama and F174, had the lowest severity infection level, although statistically similar to each other, whereas the varieties F369 and F733 had similar and significantly higher severity levels. All varieties, except for F60, showed differences among the tested pathogen concentrations, found a positive relationship between inoculum concentration and severity, which varied depending on the rice variety in which it was evaluated. Taking these results into account, it was concluded that the assessment model of infection was successful, because it allowed to find differences in the severity of infection in rice varieties and concentrations of inoculum.

Keywords : Rice panicle blight disease; cereal; inoculum concentration; rice varieties.

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