Figure 6.

Nitrogen cycle in Tarim saline soils. (A) Heat map showing the metatranscriptomic reads of genes involved in the nitrogen cycle based on deep sequencing data obtained from the soil samples. nasA and B, assimilatory nitrate reductase subunits; narB, ferredoxin-nitrate reductase; nR, nitrate reductase; nirA, B and D, nitrite reductase subunits; nrfA and H, cytochrome c nitrite reductase subunits; narG, H, I, and J, nitrate reductase subunits; napA and B, periplasmic nitrate reductase subunits; nirK and S, nitrite reductase subunits; norB and C, nitric oxide reductase subunits; nosZ, nitrous-oxide reductase; nifD, K and H, nitrogenase molybdenum-iron protein subunits; amoA, B and C, ammonia monooxygenase subunits; hao, hydroxylamine dehydrogenase; nxrA and B, nitrite oxidoreductase subunits. (B) Schematic representation of the nitrogen cycling. Phyla importantly contributed to the pathways are indicated. Dash arrow indicates the Anammox pathway is not detected in Tarim soil samples.