The most predominant fungal genera (Aspergillus,
Alternaria and Penicillium) were selected for molecular
identification to the species level by using ITS1 and ITS4
primers as described by White et al. (1990), based on
amplification of the ITS1 and ITS2 regions of ribosomal
RNA. The results from gel electrophoresis showed
evident differences among genera depending on the
sizes of amplified fragments, and these differences
provide a good tool to discriminate between genera
(Figure 1). For the genus Aspergillus, three different
fragments were seen as follow: 531, 575 and 580 bp,
while two different fragments of sizes 305 and 150 bp
were seen with genus Alternaria, finally, two fragments of
sizes 580 and 600 bp were seen within the genus
Penicillium. The ITS sequences for the contaminated
fungi were analyzed in the GenBank of NCBI, the results
of BLAST search revealed the identity of each
predominant fungi. For the genus Aspergillus, three
different species were identified as A. clavatus
(EF670001.1), A. niger (KC119204.1) and A. terreus
( EF592171.1), with identity 99 to 100%, while, two
different species were identified belonging to the species
Alternaria which were A. alternata (KC134318.1) and A.
citri (AF397051.1) (99% of identity), and two species of
the genus Penicillium were identified as P. expansum
(JX869559.1) and P. glabrum (JX421729.1) (99% of
identity).
The most predominant fungal genera (Aspergillus,Alternaria and Penicillium) were selected for molecularidentification to the species level by using ITS1 and ITS4primers as described by White et al. (1990), based onamplification of the ITS1 and ITS2 regions of ribosomalRNA. The results from gel electrophoresis showedevident differences among genera depending on thesizes of amplified fragments, and these differencesprovide a good tool to discriminate between genera(Figure 1). For the genus Aspergillus, three differentfragments were seen as follow: 531, 575 and 580 bp,while two different fragments of sizes 305 and 150 bpwere seen with genus Alternaria, finally, two fragments ofsizes 580 and 600 bp were seen within the genusPenicillium. The ITS sequences for the contaminatedfungi were analyzed in the GenBank of NCBI, the resultsof BLAST search revealed the identity of eachpredominant fungi. For the genus Aspergillus, threedifferent species were identified as A. clavatus(EF670001.1), A. niger (KC119204.1) and A. terreus( EF592171.1), with identity 99 to 100%, while, twodifferent species were identified belonging to the speciesAlternaria which were A. alternata (KC134318.1) and A.citri (AF397051.1) (99% of identity), and two species ofthe genus Penicillium were identified as P. expansum(JX869559.1) and P. glabrum (JX421729.1) (99% ofidentity).
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