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<p><i>Haematococcus lacustris</i> is a valuable natural astaxanthin resource, but insufficient biomass is one of the challenges to its efficient development. Co-culture with bacteria can potentially enhance microalgal biomass; however, bacterial inoculation methods and their role in regulating the phycosphere bacterial community in the phycosphere have not been fully investigated. Here, three phycospheric bacteria, <i>Acinetobacter beijerinckii</i>, <i>Rhizobium rosettiformans</i>, and <i>Sphingobium limneticum,</i> were co-cultured with xenic <i>H. lacustris.</i> The effects of bacteria under different inoculum ratios on <i>H. lacustris</i> cell density, cell diameter, chlorophyll content, and photosynthetic parameters were investigated. Results showed that the growth-promoting effect of the bacteria was closely associated with the inoculum ratio, emphasizing the importance of maintaining a balanced bacteria inoculum ratio in optimizing microalgae production. Furthermore, bacterial inoculation induced dramatic changes in the richness, diversity, structure, and composition and the functional predictions of the <i>H. lacustris</i> phycospheric bacterial community. This study provides a rich resource of candidate strains of natural growth-promoting bacteria and provides important insights into shaping the phycospheric bacterial community and potential biotechnological strategies to improve the biomass of <i>H. lacustris</i>.</p>

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Growth enhancement and phycospheric bacterial community shift of Haematococcus lacustris by co-culture with three phycospheric bacterial strains

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • Yun Li,
  • Wenjie Yan,
  • Yang Sun,
  • Jiaji Zhang,
  • Zenghu Zhang,
  • Xu Gao

摘要

Haematococcus lacustris is a valuable natural astaxanthin resource, but insufficient biomass is one of the challenges to its efficient development. Co-culture with bacteria can potentially enhance microalgal biomass; however, bacterial inoculation methods and their role in regulating the phycosphere bacterial community in the phycosphere have not been fully investigated. Here, three phycospheric bacteria, Acinetobacter beijerinckii, Rhizobium rosettiformans, and Sphingobium limneticum, were co-cultured with xenic H. lacustris. The effects of bacteria under different inoculum ratios on H. lacustris cell density, cell diameter, chlorophyll content, and photosynthetic parameters were investigated. Results showed that the growth-promoting effect of the bacteria was closely associated with the inoculum ratio, emphasizing the importance of maintaining a balanced bacteria inoculum ratio in optimizing microalgae production. Furthermore, bacterial inoculation induced dramatic changes in the richness, diversity, structure, and composition and the functional predictions of the H. lacustris phycospheric bacterial community. This study provides a rich resource of candidate strains of natural growth-promoting bacteria and provides important insights into shaping the phycospheric bacterial community and potential biotechnological strategies to improve the biomass of H. lacustris.