Phylogeny of some Fusarium species, as determined by large-subunit rRNA sequence comparison |
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Authors: | Guadet J; Julien J; Lafay JF; Brygoo Y |
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Institution: | Laboratoire de Cryptogamie, Universite Paris Sud, France. |
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Abstract: | Fifty-two strains from eight species of Fusarium were analyzed by rapid
rRNA sequencing. Two highly variable stretches (138 and 214 nucleotides) of
the 5' end of the 28S-like rRNA molecule were sequenced. Such stretches
permit evaluation of the divergence between closely related species and
even between varieties within a species. The phylogenetic tree computed
from the number of nucleotide differences shows seven Fusarium species to
be more closely related to one another than the eighth species, F. nivale,
is to them. On the basis of these data, we discuss both the phylogenetic
value of taxonomical criteria and the impact of our findings on the
demarcation of the genus Fusarium. We conclude that this method is suitable
for establishing a precise phylogeny between closely related species within
a genus.
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