Resumo

SOLANO-BAEZ, Alma Rosa et al. The pigmentation of Fusarium verticillioides (Sacc.) as factor of virulence in maize seedlings. Agron. Mesoam [online]. 2011, vol.22, n.2, pp.297-307. ISSN 2215-3608.

The pigmentation of Fusarium verticillioides (Sacc.) as factor of virulence in maize seedlings. This research aimed to determine the relationship between the color of the pigment produced by isolates of F. verticilliodes and virulence in maize seedlings. Symptomatic and asymptomatic corn cobs were collected in Veracruz State, Mexico during the spring-summer cycle of 2008. The experiment was analyzed using an experimental design in split plots with a double division, under greenhouse conditions during two crop cycles, fall-winter of 2008 and spring-summer of 2009, in the Postgraduate College Campus Montecillo, Mexico State. The pigmentation of the isolates obtained from symptomatic seeds with mycelium was more intense with a purple color, and the white mycelium isolates showed a more homogeneous color. Isolates from asymptomatic seeds had a tenuous violet coloration, and from white to cream coloration of mycelium. It was observed that isolates from symptomatic and asymptomatic seeds were pathogenic; the purple isolations from symptomatic seeds were more virulent than the white isolate, opposite to what happened with the isolation from asymptomatic seeds, in which the white mycelium was more virulent.

Palavras-chave : Fungi; purple-mycelium; white-mycelium; symptomatic and asymptomatic seed.

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