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A microbial consortium-based product promotes potato yield by recruiting rhizosphere bacteria involved in nitrogen and carbon metabolisms.

  • Zhenshuo Wang‎ et al.
  • Microbial biotechnology‎
  • 2021‎

The effect of a microbial consortium-based (MCB) biocontrol product, composed of Bacillus subtilis, Trichoderma harzianum strain and diatomaceous earth as a carrier, on potato yield, and potential modes of action for its effect were investigated. The MCB product (300 kg ha-1 ) was added to furrows in which the potato seed tubers each year for 3 years (2016, 2017 and 2018), while potato planting without the MCB product treatment served as the control. A metagenomic analysis indicated that bacterial phylotypes dominated the microbial community, with a relatively small contribution of archaea and fungal taxa. The relative abundance of beneficial bacterial taxa increased significantly in response to the MCB product treatment. Notably, a higher relative abundance of bacterial taxa with carbon fixation, carbon-degrading and nitrogen metabolism properties were observed in the MCB product-treated potato rhizosphere. This was also reflected in the identification of a greater abundance of genes encoding enzymes involved in nitrogen metabolism, carbon fixation and carbon degradation pathways in the conducted metagenomic analysis. The greater relative abundance of these beneficial bacterial taxa in the rhizosphere of MCB product-treated plots, as well as the higher abundance of genes associated with the indicated cellular processes, were associated with an increase in tuber yield. The observed changes in microbial community structure at an early stage of tuber development appears to have a beneficial impact on tuber yield.


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