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Principal component analysis (PCA) of DGGE banding patterns of cyst-associated bacteria obtained from cysts in fields subjected to soybean monoculture for different numbers of years (▴ 2 yr, ♦ 4 yr, • 5 yr, ▵ 8 yr, ◊ 12 yr, and ○ 40 yr sampled in 2010; ▪ 3 yr, ▾ 5 yr, ★ 6 yr, ▽ 9 yr, □ 13 yr, and ☆ 41 yr sampled in 2011).
