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<p>Fusarium root and stem rot (FRSR), caused by&#xa0;<i>Fusarium oxysporum</i> f. sp. <i>radicis-cucumerinum</i> (Forc), is an economically important disease affecting cucumber greenhouses. To reduce the use of synthetic fungicides, farmers need more alternatives for disease control. This study investigated the potential of combining potassium silicate (Si) with the native&#xa0;rhizobacterial strain&#xa0;<i>Bacillus</i>&#xa0;<i>velezensis</i> Bv-22 for the biocontrol of FRSR. Strain Bv-22 and Si (3 mM) significantly inhibited the growth of Forc. Si did not inhibit the growth of Bv-22 in vitro; rather, it enhanced the antagonistic efficacy of Bv-22 by upregulating transcript levels of antagonism-related genes. Greenhouse trials showed that applying Bv-22 and Si together provide excellent control efficacy against FRSR compared to separate treatments. Also, the decrease in cucumber plants’ growth due to the Forc-induced stress was reduced. Quantitative PCR indicated that Si, when incorporated into soils, increased the rhizospheric colonization of Bv-22. Furthermore, there is a negative correlation between Bv-22 and Forc abundances in the rhizosphere soil. The results presented here suggest that Bv-22 + Si-control of FRSR is achieved by reducing pathogen colonization in plant tissues and the rhizosphere, along with increased tissue&#xa0;Si&#xa0;content, decreased Forc-induced oxidative stress, and enhanced enzymatic and non-enzymatic defense responses in cucumber plants. A strategy depending on increasing the antagonistic capability of biocontrol microbes by Si can be proposed for the integrated management of FWS.</p>

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Potassium silicate promotes the biocontrol potential of the rhizobacterial strain Bacillus velezensis Bv-22 against fusarium root and stem rot of cucumber

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Ali A. Almasrahi,
  • Ali Aqdas,
  • Younes Y. Molan,
  • Abdullah F. Alhashel,
  • Arya Widyawan,
  • Mahmoud H. El-Komy

摘要

Fusarium root and stem rot (FRSR), caused by Fusarium oxysporum f. sp. radicis-cucumerinum (Forc), is an economically important disease affecting cucumber greenhouses. To reduce the use of synthetic fungicides, farmers need more alternatives for disease control. This study investigated the potential of combining potassium silicate (Si) with the native rhizobacterial strain Bacillus velezensis Bv-22 for the biocontrol of FRSR. Strain Bv-22 and Si (3 mM) significantly inhibited the growth of Forc. Si did not inhibit the growth of Bv-22 in vitro; rather, it enhanced the antagonistic efficacy of Bv-22 by upregulating transcript levels of antagonism-related genes. Greenhouse trials showed that applying Bv-22 and Si together provide excellent control efficacy against FRSR compared to separate treatments. Also, the decrease in cucumber plants’ growth due to the Forc-induced stress was reduced. Quantitative PCR indicated that Si, when incorporated into soils, increased the rhizospheric colonization of Bv-22. Furthermore, there is a negative correlation between Bv-22 and Forc abundances in the rhizosphere soil. The results presented here suggest that Bv-22 + Si-control of FRSR is achieved by reducing pathogen colonization in plant tissues and the rhizosphere, along with increased tissue Si content, decreased Forc-induced oxidative stress, and enhanced enzymatic and non-enzymatic defense responses in cucumber plants. A strategy depending on increasing the antagonistic capability of biocontrol microbes by Si can be proposed for the integrated management of FWS.