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<p><i>Chlorella</i>, a green alga renowned for its bioactive compounds, has significant applications in various industries such as biofuels, pharmaceuticals, and agriculture. Despite its potential, large-scale production is constrained by several challenges, including high cultivation costs and growth instability. These challenges can be addressed by co-cultivating <i>Chlorella vulgaris</i> C1 with symbiotic bacteria to enhance its growth and stability, presenting a promising approach for microalgal applications. In this study, growth-promoting traits of two dominant bacterial symbionts from <i>C. vulgaris</i> C1 namely, <i>Marinobacter alkaliphilus</i> C1 and <i>Stutzerimonas stutzeri</i> C3 were evaluated on <i>C. vulgaris</i> C1 in a co-culture setup. Co-cultivation of axenic&#xa0;<i>C. vulgaris</i> C1 with these growth-enhancing bacteria revealed a symbiotic relationship with each bacterium. There was an increased growth rate in the presence of added bacterial symbionts which specify their growth-promoting role in the microalgal culture. This study also demonstrated the growth of these heterotrophic bacterial strains on extracellular carbon released by <i>C. vulgaris</i> C1. This work highlights the potential of microalgae-bacterial interactions as an effective approach to enhance biomass yield while reducing cultivation costs. Additionally, incorporating these symbiotic relationships into microalgal cultivation systems could pave the way for innovative applications in pharmaceuticals, agriculture, and biotechnology, making them an integral part of future microalgal exploitation.</p>

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Symbiotic interactions between Chlorella vulgaris C1 and growth-promoting bacteria: a pathway to enhanced microalgal cultivation

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Sumayya Nellikakath Sainudheen,
  • Aikkarakunnath Varghese Saramma,
  • Mohamed Hatha Ammanamveetil Abdulla

摘要

Chlorella, a green alga renowned for its bioactive compounds, has significant applications in various industries such as biofuels, pharmaceuticals, and agriculture. Despite its potential, large-scale production is constrained by several challenges, including high cultivation costs and growth instability. These challenges can be addressed by co-cultivating Chlorella vulgaris C1 with symbiotic bacteria to enhance its growth and stability, presenting a promising approach for microalgal applications. In this study, growth-promoting traits of two dominant bacterial symbionts from C. vulgaris C1 namely, Marinobacter alkaliphilus C1 and Stutzerimonas stutzeri C3 were evaluated on C. vulgaris C1 in a co-culture setup. Co-cultivation of axenic C. vulgaris C1 with these growth-enhancing bacteria revealed a symbiotic relationship with each bacterium. There was an increased growth rate in the presence of added bacterial symbionts which specify their growth-promoting role in the microalgal culture. This study also demonstrated the growth of these heterotrophic bacterial strains on extracellular carbon released by C. vulgaris C1. This work highlights the potential of microalgae-bacterial interactions as an effective approach to enhance biomass yield while reducing cultivation costs. Additionally, incorporating these symbiotic relationships into microalgal cultivation systems could pave the way for innovative applications in pharmaceuticals, agriculture, and biotechnology, making them an integral part of future microalgal exploitation.