Several systems for Fusarium taxonomy can be adopted to species identification, and to define different numbers of taxa (Wollenweber and Reinking, 1935; Snyder and Hansen, 1945; Booth, 1971; Gerlach and Nirenberg, 1982; Nelson et al., 1983). However, these taxonomic systems not always agree on species limits, and character variability in species as well as the loss of characters which sometimes occurs during laboratory cultivation of strains, also make identification difficult. Correct identification is important because many species are plant pathogens and certain isolates produce potent mycotoxins (Booth, 1971; Nelson et al., 1981). Moreover, culture conditions and frequent subculturing of the strains can lead to degeneration of morphological features or loss of toxigenic capability. In fact, Marasas et al. (1984) examined several reported toxigenic isolates of Fusarium species todetermine the relationship among species identity and mycotoxin production, and found a number of strains with atypical morphological features which prevented the identification of those strains. To this regard, molecular genetic and chemotaxonomic methods of systematic analysis can provide useful data concerning the relatedness of fungal strains (Kurtzman, 1985; Frisvad and Filtenborg, 1983).
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- Molecular Genetic Criteria for the Identification of Atypical Toxigenic Fusarium Strains
Stephen W. Peterson
- Springer US
Systemische Notwendigkeit zur Weiterentwicklung von Hybridnetzen