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Effects of host resistance on theisozymatic patterns of Bipolaris sorokiniana (Dematiaceae, Moniliales)
Marta E. Valim-Labres; Miguel D.M. Porto; Aida T.S. Matsumura
Departamento de Fitossanidade, Faculdade de Agronomia, Universidade Federal do Rio Grande do Sul (UFRGS), Caixa Postal 776, 91501-970 Porto Alegre, RS, Brasil. Send correspondence to M.E.V.-L.
ABSTRACT
Nine isolates of Bipolaris sorokiniana were inoculated on three cultivars of wheat plants (susceptible, moderately resistant, resistant). Eight days after the inoculation, the isolates were recovered (27 isolates) and the following isozymatic patterns were analyzed: esterase, alkaline phosphatase, acid phosphatase, malate dehydrogenase, and superoxide dismutase. The esterase system was the most polymorphic, and the isolates recovered from the susceptible cultivar showed the highest variability. This is evidence that this cultivar exerts low selection pressure on the pathogen.
Keywords: resistance; Dematiaceae.
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