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<p>Sclerotinia stem rot, caused by the necrotrophic fungus <i>Sclerotinia sclerotiorum</i> poses a significant threat to Egyptian clover production, especially in Northern India's growing regions. To explore sustainable management strategies, thirty <i>Bacillus</i> spp. isolates were screened in vitro for their antagonistic activity against <i>S. sclerotiorum</i>. <i>Bacillus siamensis</i> B9 (Bacillales: Bacillaceae) exhibited the greatest mycelial growth inhibition (87.9%) in vitro and produced biocontrol-relevant traits, including cell wall degrading enzymes and siderophores. Field trials have demonstrated its efficacy in controlling Sclerotinia stem rot and promoting plant growth. Seed + soil treatment with <i>B. siamensis</i> B9 resulted in 83.3% disease control and increased green fodder, dry biomass, and seed yield. These findings highlight the potential of <i>B. siamensis</i> B9 as a valuable biological control agent for the sustainable management of Sclerotinia stem rot in Egyptian clover.</p>

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Bacillus siamensis strain B9 suppresses Sclerotinia stem rot in Egyptian clover

  • 期刊论文

  • 发表日期：

    2025年3月5日

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  • Sukhman Kaur Aulakh,
  • Daljeet Singh Buttar,
  • Ajay Kumar Choudhary,
  • Ashlesha Atri,
  • Gurveer Singh Brar

摘要

Sclerotinia stem rot, caused by the necrotrophic fungus Sclerotinia sclerotiorum poses a significant threat to Egyptian clover production, especially in Northern India's growing regions. To explore sustainable management strategies, thirty Bacillus spp. isolates were screened in vitro for their antagonistic activity against S. sclerotiorum. Bacillus siamensis B9 (Bacillales: Bacillaceae) exhibited the greatest mycelial growth inhibition (87.9%) in vitro and produced biocontrol-relevant traits, including cell wall degrading enzymes and siderophores. Field trials have demonstrated its efficacy in controlling Sclerotinia stem rot and promoting plant growth. Seed + soil treatment with B. siamensis B9 resulted in 83.3% disease control and increased green fodder, dry biomass, and seed yield. These findings highlight the potential of B. siamensis B9 as a valuable biological control agent for the sustainable management of Sclerotinia stem rot in Egyptian clover.