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<p>This study investigated the biological control of <i>Xanthomonas phaseoli</i> pv. <i>phaseoli </i>(Xpp) and <i>Xanthomonas citri </i>subsp. <i>fuscans</i> (Xcf), which cause common bacterial blight in bean, using antagonistic bacterial strains. A&#xa0;total of 78&#xa0;bacterial strains obtained from different sources were identified by fatty acid methyl ester analysis, and strains exhibiting <i>in vivo</i> antibacterial activity were characterized by 16S rRNA sequencing. <i>In vitro</i> tests revealed that the bacteria inhibited the growth of Xpp and Xcf strains with inhibition zones ranging from 0.95 to 37 mm. Based on these results, five effective strains were selected and tested in pot experiments using a&#xa0;randomized plot design with eight treatments (single and mixed). The treatments were found to reduce disease development by 45–100% compared to the control group. Specifically, <i>Bacillus subtilis</i> IT159, IT162, <i>and B.&#xa0;mycoides</i> ÖBF71 completely suppressed the disease caused by Xpp. However, IT159 was the only strain that achieved complete (100%) control against Xcf. Furthermore, the selected strains were shown to exhibit plant growth-supporting properties such as nitrogen fixation, nutrient solubilization, and tolerance to different pH and salt conditions. The findings indicate that <i>Bacillus</i> species, in particular, stand out as promising biocontrol agents against bacterial blight in bean. These strains have the potential to be considered alternatives to chemical pesticides in sustainable agricultural production and can contribute to disease management as an important component of integrated management strategies.</p>

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Application of Antagonistic Bacteria for Biological Control of Common Bacterial Blight in Beans

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Ayten Atay,
  • Mesude Figen Dönmez,
  • Büşran Sunyar

摘要

This study investigated the biological control of Xanthomonas phaseoli pv. phaseoli (Xpp) and Xanthomonas citri subsp. fuscans (Xcf), which cause common bacterial blight in bean, using antagonistic bacterial strains. A total of 78 bacterial strains obtained from different sources were identified by fatty acid methyl ester analysis, and strains exhibiting in vivo antibacterial activity were characterized by 16S rRNA sequencing. In vitro tests revealed that the bacteria inhibited the growth of Xpp and Xcf strains with inhibition zones ranging from 0.95 to 37 mm. Based on these results, five effective strains were selected and tested in pot experiments using a randomized plot design with eight treatments (single and mixed). The treatments were found to reduce disease development by 45–100% compared to the control group. Specifically, Bacillus subtilis IT159, IT162, and B. mycoides ÖBF71 completely suppressed the disease caused by Xpp. However, IT159 was the only strain that achieved complete (100%) control against Xcf. Furthermore, the selected strains were shown to exhibit plant growth-supporting properties such as nitrogen fixation, nutrient solubilization, and tolerance to different pH and salt conditions. The findings indicate that Bacillus species, in particular, stand out as promising biocontrol agents against bacterial blight in bean. These strains have the potential to be considered alternatives to chemical pesticides in sustainable agricultural production and can contribute to disease management as an important component of integrated management strategies.