3.2. Molecular analysis
The ITS-1 and -2 regions of the rDNA of strain SS10 was successfully
amplified by PCR, with the expected fragment sizes of
500 bp. After sequencing the PCR product, the newly identi-
fied sequence was deposited into the GenBank database under
the following Accession No. HQ401273. A BLAST search
against the GenBank or proprietary fungal DNA databases
showed that the rDNA sequence of strain SS10 showed 99%
similarity with a 603-bp ITS region of A. niger. A phylogenetic
relationship was established through the alignment and cladistic
analysis of homologous nucleotide sequences among these
fungal species (Fig. 1). Strain SS10 was shown to be the closest
to the genus Aspergillus. According to this phylogenetic analysis,
strain SS10 was classified under the genus Aspergillus as
a variant of Aspergillus niger