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<b>Abstract</b>— <p>This study examines the effects of kojic acid, chitosan, and their combinations with <i>Bacillus subtilis</i> strains on wheat resistance to dark brown spot. A concentration-dependent immunomodulatory effect of the acid on wheat resistance to <i>Bipolaris sorokiniana</i> was identified: <i>B. subtilis</i> VKM B-2604D and <i>B. subtilis</i> VKM B-2605D strains demonstrated high efficacy in protecting wheat from dark brown spot, reducing plant infestation by 50% compared to the control (80% infestation). Inclusion of kojic acid in the culture fluid of the strains at a concentration of 1.0% increased twice their immunomodulatory activity. It was established that the following compositions possessed the highest inducing activity<i>: B. subtilis</i> VKM B-2604D + <i>B. subtilis</i> VKM B-2605D CF + chitosan 0.1% + 0.5% kojic acid and <i>B. subtilis</i> VKM B 2604D + <i>B. subtilis</i> VKM B 2605D CF + chitosan 0.1% + 1.0% kojic acid. The biological activity of these compositions was 3 and 6&#xa0;times higher than the effect of the original strains.</p>

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The Effect of Kojic Acid, Chitosan, and Their Combinations with Bacillus subtilis Strains on the Inducing Activity of Bacillus subtilis Strains

  • 期刊论文

  • 发表日期：

    2026年4月16日

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  • I. L. Krasnobaeva,
  • I. I. Novikova,
  • E. V. Popova,
  • N. M. Kovalenko

摘要

Abstract—

This study examines the effects of kojic acid, chitosan, and their combinations with Bacillus subtilis strains on wheat resistance to dark brown spot. A concentration-dependent immunomodulatory effect of the acid on wheat resistance to Bipolaris sorokiniana was identified: B. subtilis VKM B-2604D and B. subtilis VKM B-2605D strains demonstrated high efficacy in protecting wheat from dark brown spot, reducing plant infestation by 50% compared to the control (80% infestation). Inclusion of kojic acid in the culture fluid of the strains at a concentration of 1.0% increased twice their immunomodulatory activity. It was established that the following compositions possessed the highest inducing activity: B. subtilis VKM B-2604D + B. subtilis VKM B-2605D CF + chitosan 0.1% + 0.5% kojic acid and B. subtilis VKM B 2604D + B. subtilis VKM B 2605D CF + chitosan 0.1% + 1.0% kojic acid. The biological activity of these compositions was 3 and 6 times higher than the effect of the original strains.