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<p>Bacterial symbionts associated with Himalayan endangered medicinal plants are less explored for their biotechnological potential. This study reports beneficial characteristics of microalgal growth-promoting bacterial symbiont <i>Bacillus</i> sp. AHE12 isolated from Himalayan endangered medicinal plant. Symbiont <i>Bacillus</i> sp. AHE12 had possessed potential plant growth promoting (PGP) characteristics including secretion of growth-promoting hormone IAA through tryptophan metabolism. Symbiont <i>Bacillus</i> sp. AHE12 significantly enhanced microalgal growth and photosynthesis in synthetic co-culturing system through IAA secretion. The interaction between AHE12 and the microalga <i>Micractinium</i> sp. GA001 has been comprehensively analyzed using various synthetic co-cultivation system setups. Symbiont AHE12 was found to be metabolically stable, improved microalgal growth (up to 47%), and enhanced photosynthesis efficiency (up to 23.68% chlorophyll b) for a prolonged duration (up to 28&#xa0;days) in the synthetic co-culturing systems. A complete genome characterization of the symbiont AHE12 further complemented the phenotypic characterizations. The hybrid genome assembly of AHE12 yielded a complete finding of elite genes involved in growth-promoting activities, especially IAA production and transportation. The study provides clear insights into the importance of Himalayan medicinal plant-associated bacterial symbionts.</p>

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Characterization of Himalayan bacterial symbiont Bacillus sp. for enhancing microalgal growth in synthetic co-culture system

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Refad Ahmed,
  • Nobin Landi,
  • Channakeshavaiah Chikkaputtaiah,
  • Egam Basar,
  • Natarajan Velmurugan

摘要

Bacterial symbionts associated with Himalayan endangered medicinal plants are less explored for their biotechnological potential. This study reports beneficial characteristics of microalgal growth-promoting bacterial symbiont Bacillus sp. AHE12 isolated from Himalayan endangered medicinal plant. Symbiont Bacillus sp. AHE12 had possessed potential plant growth promoting (PGP) characteristics including secretion of growth-promoting hormone IAA through tryptophan metabolism. Symbiont Bacillus sp. AHE12 significantly enhanced microalgal growth and photosynthesis in synthetic co-culturing system through IAA secretion. The interaction between AHE12 and the microalga Micractinium sp. GA001 has been comprehensively analyzed using various synthetic co-cultivation system setups. Symbiont AHE12 was found to be metabolically stable, improved microalgal growth (up to 47%), and enhanced photosynthesis efficiency (up to 23.68% chlorophyll b) for a prolonged duration (up to 28 days) in the synthetic co-culturing systems. A complete genome characterization of the symbiont AHE12 further complemented the phenotypic characterizations. The hybrid genome assembly of AHE12 yielded a complete finding of elite genes involved in growth-promoting activities, especially IAA production and transportation. The study provides clear insights into the importance of Himalayan medicinal plant-associated bacterial symbionts.