The microbial community in the soil that carries the gcd and pqqC genes

The four ecological niches containing microbial communities with the gcd and pqqC genes include those that have been inoculated with AM fungi (denoted as AM), those that have not been inoculated with AM fungi (denoted as NM), and those located in the rhizosphere (denoted as R) and those not located in the rhizosphere (denoted as H).