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ARS Home » Northeast Area » Frederick, Maryland » Foreign Disease-Weed Science Research » Research » Publications at this Location » Publication #162935
Title: NEW ASSOCIATION OF A TOXIGENIC RATHAYIBACTER SP. AND ANGUINA WOODI IN EHRHARTA VILLOSA VAR. VILLOSA IN SOUTH AFRICA

Author
item RILEY, I - UNIVERSITY OF ADLAIDE, AU
item SWART, A - PLANT PROTECTION RES INST
item POSTNIKOVA, E - UNIVERSITY OF NEBRASKS
item AGARKOVA, I - UNIVERSITY OF NEBRASKA
item VIDAVER, A - UNIVERSITY OF NEBRASKA
item Schaad, Norman

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 6/12/2004
Publication Date: 6/29/2004
Citation: Phytopathology 94:S88

Interpretive Summary:

Technical Abstract: A dry translucent yellow bacterial gummosis associated with A. woodi, a leaf gall nematode of E. villosa var. villosa in South Africa, was examined. Some affected galls contained bacteria only and some contained both bacteria and dormant nematodes. The bacterium was readily cultured and identified phenotypically as a Rathayibacter sp. The bacterium was Gram-positive, non-acid fast, catalase positive, hydrolyzed esculin, failed to produce acid from sorbitol, and oxidase negative. Colonies were round, non-mucoid, yellow, and 1-2 mm in diameter after 7-8 days at 25C on NBY agar. Bacteria from galls and cultures adhered to A. woodi juveniles but not those of A. funesta or A. tritici. As with R. toxicus, the agent of ryegrass toxicity, bioassays indicated in planta production of toxin. DNA from the bacterium had only 70% homology with other Rathayibacter species and gave a distinct AFLP pattern. These data are indicative of a new Rathayibacter species.