Novel ecological implications of non-toxic Microcystis towards toxic ecotype in population—promoting toxic ecotype dominance at various N levels and cooperative defense against luteolin-stress.
In: FEMS Microbiology Ecology, Jg. 99 (2023-12-01), Heft 12, S. 1-17
academicJournal
Zugriff:
Microcystin (MC)-producing (MC + ) and MC-free (MC − ) Microcystis always co-exist and interact during Microcystis -dominated cyanobacterial blooms (MCBs), where MC + Microcystis abundance and extracellular MC-content (EMC) determine the hazard extent of MCBs. The current study elucidated intraspecific interaction between MC + and MC − Microcystis at various nitrogen (N) levels (0.5–50 mg/L) and how such N-mediated interaction impacted algicidal and EMC-inhibiting effect of luteolin, a natural bioalgicide. Conclusively, MC + and MC − Microcystis were inhibited mutually at N-limitation (0.5 mg/L), which enhanced the algicidal and EMC-inhibiting effects of luteolin. However, at N-sufficiency (5–50 mg/L), MC − Microcystis promoted MC + ecotype growth and dominance, and such intraspecific interaction induced the cooperative defense of two ecotypes, weakening luteolin's algicidal and EMC-inhibiting effects. Mechanism analyses further revealed that MC + Microcystis in luteolin-stress co-culture secreted exopolymeric substances (EPSs) for self-protection against luteolin-stress and also released more EMC to induce EPS-production by MC − Microcystis as protectants, thus enhancing their luteolin-resistance and promoting their growth. This study provided novel ecological implications of MC − Microcystis toward MC + ecotype in terms of assisting the dominant establishment of MC + Microcystis and cooperative defense with MC + ecotype against luteolin, which guided the application of bioalgicide (i.e. luteolin) for MCBs and MCs pollution mitigation in different eutrophication-degree waters. [ABSTRACT FROM AUTHOR]
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Titel: |
Novel ecological implications of non-toxic Microcystis towards toxic ecotype in population—promoting toxic ecotype dominance at various N levels and cooperative defense against luteolin-stress.
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Autor/in / Beteiligte Person: | Guo, Zhonghui ; Li, Jieming ; Luo, Di ; Zhang, Mingxia |
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Zeitschrift: | FEMS Microbiology Ecology, Jg. 99 (2023-12-01), Heft 12, S. 1-17 |
Veröffentlichung: | 2023 |
Medientyp: | academicJournal |
ISSN: | 0168-6496 (print) |
DOI: | 10.1093/femsec/fiad138 |
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