Figure 6

Spatial distributions of putative cprA, nifH and bamB genes in segments of 0–2 cm, 2–5 cm, 5–8 cm, 8–11 cm, 11–13 cm and 13–15 cm, respectively.
(A) quantitive distribution of cprA. F4r3g1, f4r3-g2, f5r4-g1 and f5r4-g1 indicated the amplified products with primer sets of f4-m3-g1/ r3-m3-g1, f4-m3-g2/r3-m3-g2, f5-m3-g1/r4-m1 and f5-m3-g2/r4-m1, respectively; (B) quantitive distribution of bamB-like genes; (C) quantitive distribution of nifH-like genes.