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Mechanistic insights into light-driven self-regulation of microbial interactions and metabolic shifts in autotrophic algal-bacterial systems
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DOI：10.1016/j.biortech.2026.134628.png)
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Abstract
En 中文
Light intensity regulates energy input and ecological balance in algal-bacterial symbiotic systems; however, underlying light-driven mechanisms remain unclear. This study explored microbial community succession, functional shifts, and metabolic regulation under light gradients in an algal-bacterial symbiotic system comprising microalgae, partial-nitrification, and anaerobic ammonium oxidation. Light intensity exhibited a dual effect. Optimal total nitrogen removal efficiency (TNRE) reached 91% at a light intensity of 280 +/- 10 & micro;mol/ (m2 center dot s), reflecting balanced algal-bacterial interactions. Higher light (380 +/- 10 & micro;mol/(m2 center dot s)) induced excessive oxygen production and nitrite accumulation, thereby reducing TNRE to 76%. Ultra-high light (480 +/- 10 & micro;mol/ (m2 center dot s)) triggered algal photoinhibition, decreasing oxygen production and restoring TNRE to 88%. Microbial network stability declined with increasing light intensity but recovered under ultra-high light. Meanwhile, metabolism shifted significantly from purine and nucleotide metabolism to tryptophan metabolism (p < 0.05), reflecting a metabolic transition from proliferative growth to stress resistance. These findings demonstrate the intrinsic light-driven self-regulatory mechanism in autotrophic algal-bacterial systems.
Keywords:
Anammox
Partial nitrification
Algae
Nitrogen removal
Light intensity
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9
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3.2W
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17.3W
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