Sandaracinobacter alcalinohabitum T42 is a novel species isoalted from swine wastewater that can promote plant growth through secreting IAA and organic matter degradation.
The discharge of nutrient-rich swine wastewater poses significant environmental hazards, including eutrophication, greenhouse gas emissions, and the dissemination of antimicrobial resistance. Microalgae–bacteria consortia have emerged as sustainable biotreatment systems capable of nutrient removal and biomass production, yet their potential as reservoirs of plant growth-promoting microorganisms remains underexplored. Here, we demonstrate that cultivation of microalgae in swine wastewater reshapes the bacterial community, enriching taxa associated with metabolite secretion. From this system, we isolated a previously undescribed bacterium of the genus Sandaracinobacter that secretes high levels of indole-3-acetic acid (IAA). Functional assays reveal that this strain significantly enhances the growth and root development of Oryza sativa under controlled conditions. These findings reveal a direct link between wastewater bioremediation and sustainable agriculture, highlighting microalgae–bacteria consortia as a source of beneficial microbes with dual roles in environmental purification and crop productivity. Our work provides a new strategy for integrating waste valorization with plant growth promotion.
The discharge of nutrient-rich swine wastewater poses significant environmental hazards, including eutrophication, greenhouse gas emissions, and the dissemination of antimicrobial resistance. Microalgae–bacteria consortia have emerged as sustainable biotreatment systems capable of nutrient removal and biomass production, yet their potential as reservoirs of plant growth-promoting microorganisms remains underexplored. Here, we demonstrate that cultivation of microalgae in swine wastewater reshapes the bacterial community, enriching taxa associated with metabolite secretion. From this system, we isolated a previously undescribed bacterium of the genus Sandaracinobacter that secretes high levels of indole-3-acetic acid (IAA). Functional assays reveal that this strain significantly enhances the growth and root development of Oryza sativa under controlled conditions. These findings reveal a direct link between wastewater bioremediation and sustainable agriculture, highlighting microalgae–bacteria consortia as a source of beneficial microbes with dual roles in environmental purification and crop productivity. Our work provides a new strategy for integrating waste valorization with plant growth promotion.
Hunan Normal University