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Systematic position of septobasidium graphiola and other basidiomycetes as deduced on the basis of their 5s ribosomal rna nucleotide sequences

Systematic & Applied Microbiology 8(1-2): 121-127

Systematic position of septobasidium graphiola and other basidiomycetes as deduced on the basis of their 5s ribosomal rna nucleotide sequences

The 5S rRNA sequences from the Basidiomycetes Atractiella solani, Ceratobasidium cornigerum, Graphiola phoenicis, Phleogena faginea, Platygloea peniophorae, Septobasidium carestianum, Tulasnella violea and Uthatobasidium fusisporum were determined. Comparison of these sequences with all the other basidiomycetous sequences analyzed so far revealed the existence of two different types of 5S rRNA secondary structures in the Basidiomycetes, type A and type B. While the type A molecules are characterized by an extra 'U' in position 107 and, with one exception, a 'U-G' or 'G-U' pair in position 2/118, in the type B secondary structures this extra 'U' is missing and a 'U-U' mispairing is found in position 2/118. In addition to these differences a high number of nucleotide exchanges occurs, accounting for at least one fourth of all 5S rRNA nucleotides. Within the two groups, the organisms are subdivided into sequence clusters. Both Platygloea peniophorae, which shares the same cluster with the smuts parasitizing dicots, and Septobasidium carestianum, which shows high sequence homology with Pachnocybe ferruginea and Rhizoctonia crocorum, have the type A molecule. The other organisms analyzed possess the type B molecule. Graphiola phoenicis is in the same cluster as Tilletia controversa, Exobasidium vaccinii and the graminicolous smuts, Ceratobasidium cornigerum and Uthatobasidium fusisporum fit into the sequence cluster containing the Homobasidiomycetes and members from several heterobasidiomycetous orders. The sequences of Atractiella solani and Phleogena faginea have similar signature nucleotides. They do not fit into any of the existing sequence clusters, neither does Tulasnella violea.

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Accession: 006574084

DOI: 10.1016/S0723-2020(86)80159-X

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