Fig. 1.

Quantification of genomic DNA of Streptomyces turgidiscabies in total DNA extracted from tubers. Eight genotypes of potato plants were grown in a field infested with S. turgidiscabies. DNA was extracted from the tubers of each of the eight genotypes at the flowering stage, and the quantity of genomic DNA of S. turgidiscabies was assessed by a real-time PCR assay using a TaqMan probe. The significance of differences in the amount of the genomic DNA of S. turgidiscabies between resistant and susceptible potato genotypes was tested by the two sample t-test. ** indicates significance at the 1% level (P<0.01).