3 RESULTS
3.1 Effects of soil microorganisms onN. tabacumfitness
Variation and development of soil microbiomes exert distinct effects onN. tabacumfitness. As shown in Figure 1a, soil sterilization treatment prior to sowing significantly decreased biomass accumulation when plants grew in FS (p < 0.05), but not if grown in CCS (p = 0.94). In addition, no significant difference was found in biomass allocation patterns in N. tabacum , with one exception: soil sterilization treatment prior to sowing markedly decreased leaf mass when plants were grown in FS (Figure 1b). Specifically, the LMA of N. tabacum plants grown in F_S were significantly higher than those grown in F_NS (Figure 1c).