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Os espaçadores internos transcritos do DNA nuclear ribossomal (ITS1 e ITS2) de folhas de Drosera (Droseraceae) foram amplificados com o emprego de iniciadores universais. A análise demonstrou que a maior parte das amostras continha uma mistura resultante de amplificações não-específicas. Dentre as sequências de DNA obtidas, duas delas foram de fungos basidiomicetos. Sequências homólogas foram obtidas do GenBank e analisadas junto às sequências obtidas de folhas de Drosera. Através das análises filogenéticas de máxima parcimônia foi possível identificar uma seqüência como sendo de um Ustilaginomycetes e outra de Heterobasidiomycetes (Basidiomycota). Possivelmente esses organismos estavam associados às folhas de Drosera e assim não sejam resultantes de contaminação. Com o objetivo de otimizar e buscar uma melhor especificidade das reações de PCR, um protocolo bem sucedido foi demonstrado com o uso de dimetilsulfóxido (DMSO) e soroalbumina bovina (BSA).The nuclear ribosomal DNA internal transcribed spacers (ITS1 and ITS2) from leaves of Drosera (Droseraceae) were amplified using universal primers. The analysis of the products demonstrated most samples were a molecular mixture as a result of unsuccessful and non-specific amplifications. Among the obtained sequences, two were from Basidiomycota fungi. Homologous sequences of Basidiomycota were obtained from GenBank database and added to a data set with sequences from Drosera leaves. Parsimony analysis demonstrated that one sequence was amplified from an Ustilaginomycetes fungus, and another from a Heterobasidiomycetes. Possibly these fungi were associated to leaves of Drosera, and not because of samples contamination. In order to provide optimization and a better specificity of PCR (polymerase chain reaction), a very successful method was demonstrated using dimethyl sulfoxide (DMSO) and bovine serum albumin (BSA) in reactions

Plant or fungal sequences? An alternative optimized PCR protocol to avoid ITS (nrDNA) misamplification