For the quantification of grape samples positive to A. carbonarius
presence, a SYBR-Green I Real Time PCR assay was implemented
using the AcKS10L/R primers (Selma et al., 2008). To generate the
standard curve (Fig. 3), serial dilutions of A. carbonarius 5010
template DNA measured spectrophotometrically, were used in
duplicate. The regression coefficient (R2) was above 0.99 with an
estimated curve slope of 3.23, indicating an assay efficiency of
104.2%. Based on Selma et al. (2008) the genomic DNA weight of
A. carbonarius is assumed similar to that of Aspergillus niger which is
4.13 105 ng per haploid genome. The range of haploid genomes
that could be determined from the standard curve generated was
from 12 to 12 105. The amount of A. carbonarius DNA in the 37
natural grape samples positive for A. carbonarius detection, were
calculated using the equation of the standard curve and the corresponding
Ct values (Fig. 4). Conversion of these values to haploid
genomes showed a representation of A. carbonarius from as low as
13 to 50 103 haploid genomes per g of grape. Melt curve analysis
verified the specificity of the real time PCR reaction and the absence
of by-products
For the quantification of grape samples positive to A. carbonariuspresence, a SYBR-Green I Real Time PCR assay was implementedusing the AcKS10L/R primers (Selma et al., 2008). To generate thestandard curve (Fig. 3), serial dilutions of A. carbonarius 5010template DNA measured spectrophotometrically, were used induplicate. The regression coefficient (R2) was above 0.99 with anestimated curve slope of 3.23, indicating an assay efficiency of104.2%. Based on Selma et al. (2008) the genomic DNA weight ofA. carbonarius is assumed similar to that of Aspergillus niger which is4.13 105 ng per haploid genome. The range of haploid genomesthat could be determined from the standard curve generated wasfrom 12 to 12 105. The amount of A. carbonarius DNA in the 37natural grape samples positive for A. carbonarius detection, werecalculated using the equation of the standard curve and the correspondingCt values (Fig. 4). Conversion of these values to haploidgenomes showed a representation of A. carbonarius from as low as13 to 50 103 haploid genomes per g of grape. Melt curve analysisverified the specificity of the real time PCR reaction and the absenceof by-products
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