Effects of light on microbial degradation of dissolved organic matter: source-dependent regulation by lignin-like molecules.

Front Microbiol · 2026 · PMC13442646 · PMID 42564341

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Key pathway differences included: LogBA → DOC Rem was highly significant under dark conditions but not under light-coupled conditions; E2/E3 → DOC Rem shifted from a positive effect in the microbe-only treatment to no effect under coupling; meanwhile, the SUVA254 → LogBA path was significant in the microbe-only treatment, indicating bacterial preference for small aromatic fractions.

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