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<p>The use of microorganisms and their metabolites in the bioprotection of plants is critical, especially given the negative effects of synthetic pesticides. Therefore, we aimed in this study to test the efficiency of culture filtrate of a cyanobacterial strain (<i>Nostoc</i> sp. OP730945) and the living cells of an endophytic bacterium (<i>Priestia endophytica</i> PV928014) against <i>Rhizoctonia solani</i> and <i>Fusarium solani</i>, the main cause of root rot disease in faba bean. <i>Nostoc</i> sp. filtrate and <i>P</i>. <i>endophytica</i> demonstrated strong antagonistic activity against the pathogens <i>R</i>. <i>solani</i> and <i>F</i>. <i>solani</i>. In a pot experiment, we tested the impact of <i>Nostoc</i> sp. filtrate and <i>P</i>. <i>endophytica</i> on stimulating faba bean growth under biotic stress. The results showed that the growth parameters were increased due to <i>Nostoc</i> sp. filtrate and <i>P</i>. <i>endophytica</i> applications in the presence of the fungal pathogens. Moreover, the applications of the pathogens <i>R</i>. <i>solani</i> and <i>F</i>. <i>solani</i> activated the plant defense system, including levels of proline, total phenols, ascorbic acid, and peroxidase (POD). However, the concentration of the defense related molecules were reduced due to the bioprotection applications of <i>Nostoc</i> sp. filtrate and <i>P</i>. <i>endophytica</i> likely because of of reduced stress. On the other hand, we observed higher polyphenol oxidase (PPO) activity in <i>Nostoc</i> sp. filtrate and <i>P</i>. <i>endophytica</i> applications in the presence of the pathogens. In addition, soil enzyme activities (dehydrogenase, chitinase, and protease) were enhanced significantly at <i>P</i> ≤ 0.05 due to <i>Nostoc</i> sp. filtrate and <i>P</i>. <i>endophytica</i> applications in the presence of the fungal pathogens. We found that the <i>P</i>. <i>endophytica</i> application was more pronounced in enhancing faba bean growth and suppressing <i>R</i>. <i>solani</i> and <i>F</i>. <i>solani</i> fungal pathogens. Hence, our results recommended that <i>Nostoc</i> sp. filtrate and/or <i>P</i>. <i>endophytica</i> could be employed as effective bioprotectants and biostimulants to manage root rot disease in faba bean plants.</p>

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Evaluation of Nostoc sp. culture filtrate and Priestia endophytica for the bioprotection and growth promotion of faba bean plants (Vicia faba L.) against root rot disease

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Mona F. Ghazal,
  • Gehan M. Salem,
  • Naeem M. E. Doha,
  • Aya Ahmed Nader,
  • Ghada G. Abdel-Fattah,
  • Ahmed M. El-Sawah

摘要

The use of microorganisms and their metabolites in the bioprotection of plants is critical, especially given the negative effects of synthetic pesticides. Therefore, we aimed in this study to test the efficiency of culture filtrate of a cyanobacterial strain (Nostoc sp. OP730945) and the living cells of an endophytic bacterium (Priestia endophytica PV928014) against Rhizoctonia solani and Fusarium solani, the main cause of root rot disease in faba bean. Nostoc sp. filtrate and P. endophytica demonstrated strong antagonistic activity against the pathogens R. solani and F. solani. In a pot experiment, we tested the impact of Nostoc sp. filtrate and P. endophytica on stimulating faba bean growth under biotic stress. The results showed that the growth parameters were increased due to Nostoc sp. filtrate and P. endophytica applications in the presence of the fungal pathogens. Moreover, the applications of the pathogens R. solani and F. solani activated the plant defense system, including levels of proline, total phenols, ascorbic acid, and peroxidase (POD). However, the concentration of the defense related molecules were reduced due to the bioprotection applications of Nostoc sp. filtrate and P. endophytica likely because of of reduced stress. On the other hand, we observed higher polyphenol oxidase (PPO) activity in Nostoc sp. filtrate and P. endophytica applications in the presence of the pathogens. In addition, soil enzyme activities (dehydrogenase, chitinase, and protease) were enhanced significantly at P ≤ 0.05 due to Nostoc sp. filtrate and P. endophytica applications in the presence of the fungal pathogens. We found that the P. endophytica application was more pronounced in enhancing faba bean growth and suppressing R. solani and F. solani fungal pathogens. Hence, our results recommended that Nostoc sp. filtrate and/or P. endophytica could be employed as effective bioprotectants and biostimulants to manage root rot disease in faba bean plants.