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Principal-coordinates analysis of 16S rRNA gene sequences of clone libraries for bacteria derived from roots (○) and tubers (●) of eight potato genotypes (R1 [Yukirasha], R2 [02005-10], R3 [Snow March], M1 [Star Ruby], M2 [Snowden], S1 [Irish Cobbler], S2 [Toyoshiro], and S3 [Piruka]) grown in a field infested with common scab. The ordinations were constructed using UniFrac distances weighted by the relative abundance.
