Abstract
Tobacco bacterial wilt (TBW) is seriously damages the growth of tobacco. There is an urgent need to find a safer and more effective measure to control TBW. In this study, B. amyloliquefaciens ZM9 and marigold powder were applied to the tobacco roots alone or in combination, and the potential inhibition of TBW was assessed. On the other hand, the effects of these treatments on soil physicochemical properties, rhizosphere microbial community and soil metabolites were also evaluated. The results showed that the application of B. amyloliquefaciens ZM9 or marigold powder alone significantly reduced the abundance of R. solanacearum in rhizosphere soil, while the integrated treatment showed the strongest inhibitory effect. Moreover, the integrated treatment can inhibit the secretion of chemoattractants, and affect the change of rhizosphere soil microbial composition. In conclusion, the combination of antagonistic bacteria agent B. amyloliquefaciens ZM9 with marigold powder can enhance the suppression of TBW. Furthermore, B. amyloliquefaciens ZM9 and marigold have synergistic effects on suppressing TBW by regulation soil physicochemical properties, soil metabolites and microbial structure. This study provide a promising strategy for TBW control by integrated applying of B. amyloliquefaciens ZM9 and marigold powder.
Highlights
Tobacco bacterial wilt (TBW) is seriously damages the growth of tobacco
This study provide a promising strategy for TBW control by integrated applying of B. amyloliquefaciens ZM9 and marigold powder
Bacterial wilt is a typical soil-borne disease caused by R. solanacearum, which seriously damages the growth of tobacco[1]
Summary
Tobacco bacterial wilt (TBW) is seriously damages the growth of tobacco. There is an urgent need to find a safer and more effective measure to control TBW. B. amyloliquefaciens ZM9 and marigold have synergistic effects on suppressing TBW by regulation soil physicochemical properties, soil metabolites and microbial structure. Our previous study showed that B. amyloliquefaciens ZM9 as an efficient biocontrol agent can suppress tobacco bacterial wilt (TBW)[13,14]. We found that marigold and tobacco intercropping can effectively reduce the incidence of TBW, affect the soil microbial community and soil physicochemical p roperties[20]. The main objectives of this study were to (1) evaluate the potential of antagonistic bacteria B. amyloliquefaciens ZM9 and antibacterial plant marigold, alone or in combination, to suppress TBW; and (2) investigate the effects of these treatments on soil physicochemical properties, rhizosphere microbial community and soil metabolites. This study proposed a new approach to control TBW by combining of B. amyloliquefaciens ZM9 and marigold
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