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<p>Soybean charcoal rot, caused by <i>Macrophomina phaseolina</i> is one of the most destructive soil-borne diseases that restrict soybean production under high temperature and drought stress. In this study, we explored the biocontrol potential of <i>Streptomyces corchorusii</i> and <i>S. olivaceoviridis</i> against <i>M. phaseolina</i> under in vitro, greenhouse, and field conditions. Both isolates showed high inhibitory effects in dual culture tests against <i>M. phaseolina</i>. Both isolates secreted cellulases, amylase and proteases extracellular indicating active participation of the different mechanisms. In the greenhouse, <i>S. corchorusii</i> and <i>S. olivaceoviridis</i> reduced soybean mortality by 39.9 and 31.5%, respectively, compared to the infected control. Under natural field conditions disease incidence and index were reduced by 74.1 and 62.2%, respectively with <i>S. corchorusii</i>, and 67.9 and 31.1% with <i>S. olivaceoviridis</i>. Both isolates also exerted a stimulatory effect on the growth and yield parameters of plants with a higher number of pods per plant and grain yield over the untreated control. The findings reveal that <i>Streptomyces</i> spp. exhibit promising biocontrol and plant growth-promoting activities, suitable for replacing chemical fungicides to manage charcoal rot in soybean.</p>

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Biological control of charcoal rot disease of soybean, Macrophomina phaseolina, using Streptomyces spp. isolates

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Kamal A. M. Abo-Elyousr,
  • Najeeb M. Almasoudi,
  • Md Mosaddekur Rahman,
  • Mansour M. El-Fawy,
  • Hadeel M. K. Bagy,
  • Nashwa M. A. Sallam

摘要

Soybean charcoal rot, caused by Macrophomina phaseolina is one of the most destructive soil-borne diseases that restrict soybean production under high temperature and drought stress. In this study, we explored the biocontrol potential of Streptomyces corchorusii and S. olivaceoviridis against M. phaseolina under in vitro, greenhouse, and field conditions. Both isolates showed high inhibitory effects in dual culture tests against M. phaseolina. Both isolates secreted cellulases, amylase and proteases extracellular indicating active participation of the different mechanisms. In the greenhouse, S. corchorusii and S. olivaceoviridis reduced soybean mortality by 39.9 and 31.5%, respectively, compared to the infected control. Under natural field conditions disease incidence and index were reduced by 74.1 and 62.2%, respectively with S. corchorusii, and 67.9 and 31.1% with S. olivaceoviridis. Both isolates also exerted a stimulatory effect on the growth and yield parameters of plants with a higher number of pods per plant and grain yield over the untreated control. The findings reveal that Streptomyces spp. exhibit promising biocontrol and plant growth-promoting activities, suitable for replacing chemical fungicides to manage charcoal rot in soybean.