Characterization of Pseudomonas fuscovaginae and Differentiation from Other Fluorescent Pseudomonads Occurring on Rice in Burundi

Authors

  • E. Duveiller,

    1. Laboratoire de Phytopathologie, Université Catholique de Louvain, Kitami Agricultural Experiment Station, Institut des Sciences Agronomiques du Burundi
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    • Laboratoire de Phytopathologie, Université Catholique de Louvain, Place Croix du Sud 3, B-1348 Louvain-la-Neuve (Belgium).

  • K. Miyajima,

    1. Laboratoire de Phytopathologie, Université Catholique de Louvain, Kitami Agricultural Experiment Station, Institut des Sciences Agronomiques du Burundi
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    • Kitami Agricultural Experiment Station, Kunneppu, Hokkaido 099-14 (Japan).

  • F. Snacken,

    1. Laboratoire de Phytopathologie, Université Catholique de Louvain, Kitami Agricultural Experiment Station, Institut des Sciences Agronomiques du Burundi
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    • Laboratoire de Phytopathologie, Université Catholique de Louvain, Place Croix du Sud 3, B-1348 Louvain-la-Neuve (Belgium).

  • A. Autrique,

    1. Laboratoire de Phytopathologie, Université Catholique de Louvain, Kitami Agricultural Experiment Station, Institut des Sciences Agronomiques du Burundi
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    • Institut des Sciences Agronomiques du Burundi, B.P. 795, Bujumbura (Burundi).

  • H. Maraite

    1. Laboratoire de Phytopathologie, Université Catholique de Louvain, Kitami Agricultural Experiment Station, Institut des Sciences Agronomiques du Burundi
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    • Laboratoire de Phytopathologie, Université Catholique de Louvain, Place Croix du Sud 3, B-1348 Louvain-la-Neuve (Belgium).


Abstract

In various pathogenicity, serological, physiological and biochemical tests, performed in Belgium and Japan, the Pseudomonas fuscovaginae strains associated above 1,350 m elevation in Burundi with sheath brown rot of rice, rusty seed and black, stripes on seedlings, were found to be similar to reference strains of this pathogen from Japan. The same bacteria was detected on rice seeds imported from Asia to Burundi. Beside the serological characteristics, P. fuscovaginae can be differentiated from other oxidase and arginine dihydrolase positive non-pathogenic fluorescent pseudomonads, also isolated from lesions on rice seedlings, by the simultaneous occurrence of no production of 2-ketogluconate, acid production from trehalose, but not from inositol. Occasionally, other symptoms inducing, oxidase positive, fluorescent pseudomonads, different from any described species, were isolated from rice seedlings and sheath rot in Burundi.

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