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Genetic characteristics of Fusarium verticillioides isolates from maize in Costa Rica by Danielsen; Meyer; Funck Jensen is a Agricultural and Biological Sciences article available to read on EtoBox.

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Thirty‐nine isolates of __Fusarium verticillioides__ from maize seeds from three regions of Costa Rica were classified on fertility, fumonisin production, vegetative compatibility and pathogenicity. The identity of the isolates was verified by sexual crosses with standard tester strains and by isozyme analysis. Twenty‐three isolates (59%) were mating type A^−^ and 16 (41%) were A^+^; 29 (74%) were female fertile. The isolates produced high amounts of fumonisin B~1~ when grown on sterilized maize grits, 32 isolates producing more than 1000 μg g^−1^, as determined by TLC, and 7 less than 1000 μg g^−1^. Vegetative compatibility tests by pairing __nit__ mutants identified 34 vegetative compatibility groups (VCGs), of which 29 had one member and 5 had two members. Isolates belonging to the same VCG were obtained from the same seed sample. Two pathogenicity tests with different inoculation methods were performed: on toothpick inoculation of 7‐week‐old maize stalks, 71% of the isolates were pathogenic according to the length of the necrosis formed in the stalk, and on sand inoculation of maize seedlings all the isolates were pathogenic, according to shoot length and dry weight production.

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Author

Danielsen; Meyer; Funck Jensen

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 0032-0862)

Published

1998

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)