Primer specificity and sensitivity. Fol is a soil-borne
fungus that causes tomato wilt worldwide. Three physiological races of Fol have been reported worldwide, where race 1 is most common in countries with warm climates. However, moleculardiagnosis of these races is challenging since only the genome sequence of Fol race 2 is publicly available (http://www.broadinstitute.org/). Fol SIX1 gene encodes for a virulence factor towards tomato plants, which is secreted in the xylem of the host during colonization [32]. Significantly, Six1 has been shown to be a key protein required for full virulence of the pathogen [36] and is a suitable target for diagnostics. Figure 5 shows that PCR analyses targeting a small fragment of SIX1, using primer sets P12-F2B and FOL SIX1-R1 resulted in a clear and specific amplicon for Fol
strains. In addition, no false-positive amplicons were observed
when tested with other Fusarium species (Figure 5), as has been
previously reported by Lievens et al. [31]. Using the DNA
extraction method described earlier and primer sets P12-F2B and
FOL-SIX1-R1, we determined that the limit of detection is 10 pg
of gDNA/ real-time PCR.
Primer specificity and sensitivity. Fol is a soil-bornefungus that causes tomato wilt worldwide. Three physiological races of Fol have been reported worldwide, where race 1 is most common in countries with warm climates. However, moleculardiagnosis of these races is challenging since only the genome sequence of Fol race 2 is publicly available (http://www.broadinstitute.org/). Fol SIX1 gene encodes for a virulence factor towards tomato plants, which is secreted in the xylem of the host during colonization [32]. Significantly, Six1 has been shown to be a key protein required for full virulence of the pathogen [36] and is a suitable target for diagnostics. Figure 5 shows that PCR analyses targeting a small fragment of SIX1, using primer sets P12-F2B and FOL SIX1-R1 resulted in a clear and specific amplicon for Folstrains. In addition, no false-positive amplicons were observedwhen tested with other Fusarium species (Figure 5), as has beenpreviously reported by Lievens et al. [31]. Using the DNAextraction method described earlier and primer sets P12-F2B andFOL-SIX1-R1, we determined that the limit of detection is 10 pgof gDNA/ real-time PCR.
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