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Background and Aims <p>Drought stress is one of the critical environmental factors limiting plant growth and development. The utilization of beneficial PGPR to enhance plant drought tolerance has become a current research focus. This study elucidates the synergistic mechanisms by which mixed <i>Bacillus</i> strains enhance growth and drought tolerance in seedlings through multiple physiological pathways.</p> Methods <p>This study employed <i>Paeonia ostii</i> ‘Feng Dan’ as the experimental material and investigated the effects of different combinations of <i>Bacillus megaterium</i>, <i>Bacillus subtilis</i>, and <i>Bacillus amyloliquefaciens</i> on seedling growth and drought tolerance under different application frequencies and moisture conditions.</p> Results <p>Inoculation with the three <i>Bacillus</i> strains synergistically improved seedling growth, photosynthetic efficiency, root activity, and osmoregulatory substance accumulation. Additionally, it mitigated oxidative stress by reducing reactive oxygen species (ROS) and malondialdehyde (MDA) levels, while optimizing stomatal aperture, root lignification, architecture, and the rhizosphere soil microenvironment. Under drought stress, two inoculation elevated root activity by 124.40%, transpiration rate by 97.56%, soluble sugar by 84.32%, and proline by 72.05%, while reducing MDA by 55.00% and increasing soil ammonium nitrogen by 47.05%.</p> Conclusion and meaning <p>Two inoculation with the three mixed <i>Bacillus</i> consortium optimally enhances <i>P. ostii</i> ‘Feng Dan’ growth and drought resilience. These findings advance theoretical frameworks for ornamental cultivation in field and substantiate the role of PGPR in sustainable agriculture.</p>

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Effects of Bacillus on the growth and drought tolerance of Paeonia ostii ‘Feng Dan’

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Ayimukezi Maimaitizunong,
  • Shixin Guan,
  • Aowei Xu,
  • Dairu Jiang,
  • Wenhui Song,
  • Zhong Chen,
  • Xiaomei Sun

摘要

Background and Aims

Drought stress is one of the critical environmental factors limiting plant growth and development. The utilization of beneficial PGPR to enhance plant drought tolerance has become a current research focus. This study elucidates the synergistic mechanisms by which mixed Bacillus strains enhance growth and drought tolerance in seedlings through multiple physiological pathways.

Methods

This study employed Paeonia ostii ‘Feng Dan’ as the experimental material and investigated the effects of different combinations of Bacillus megaterium, Bacillus subtilis, and Bacillus amyloliquefaciens on seedling growth and drought tolerance under different application frequencies and moisture conditions.

Results

Inoculation with the three Bacillus strains synergistically improved seedling growth, photosynthetic efficiency, root activity, and osmoregulatory substance accumulation. Additionally, it mitigated oxidative stress by reducing reactive oxygen species (ROS) and malondialdehyde (MDA) levels, while optimizing stomatal aperture, root lignification, architecture, and the rhizosphere soil microenvironment. Under drought stress, two inoculation elevated root activity by 124.40%, transpiration rate by 97.56%, soluble sugar by 84.32%, and proline by 72.05%, while reducing MDA by 55.00% and increasing soil ammonium nitrogen by 47.05%.

Conclusion and meaning

Two inoculation with the three mixed Bacillus consortium optimally enhances P. ostii ‘Feng Dan’ growth and drought resilience. These findings advance theoretical frameworks for ornamental cultivation in field and substantiate the role of PGPR in sustainable agriculture.