期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 111, 期 24, 页码 9009-9014出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1402130111
关键词
chemical ecology; systems biology; mass spectrometry
资金
- UK Natural Environmental Research Council's (NERC) Biomolecular Analysis Facility at the University of Birmingham [R8-H10-61]
- National Science Foundation [OCE-1060300]
- University of Washington Proteomics Resource Bioinformatics Team [UWPR95794]
- Directorate For Geosciences
- Division Of Ocean Sciences [1060300] Funding Source: National Science Foundation
- Natural Environment Research Council [NBAF010004] Funding Source: researchfish
- NERC [NBAF010004] Funding Source: UKRI
Competition is a major force structuring marine planktonic communities. The release of compounds that inhibit competitors, a process known as allelopathy, may play a role in the maintenance of large blooms of the red-tide dinoflagellate Karenia brevis, which produces potent neurotoxins that negatively impact coastal marine ecosystems. K. brevis is variably allelopathic to multiple competitors, typically causing sublethal suppression of growth. We used metabolomic and proteomic analyses to investigate the role of chemically mediated ecological interactions between K. brevis and two diatom competitors, Asterionellopsis glacialis and Thalassiosira pseudonana. The impact of K. brevis allelopathy on competitor physiology was reflected in the metabolomes and expressed proteomes of both diatoms, although the diatom that co-occurs with K. brevis blooms (A. glacialis) exhibited more robust metabolism in response to K. brevis. The observed partial resistance of A. glacialis to allelopathy may be a result of its frequent exposure to K. brevis blooms in the Gulf of Mexico. For the more sensitive diatom, T. pseudonana, which may not have had opportunity to evolve resistance to K. brevis, allelopathy disrupted energy metabolism and impeded cellular protection mechanisms including altered cell membrane components, inhibited osmoregulation, and increased oxidative stress. Allelopathic compounds appear to target multiple physiological pathways in sensitive competitors, demonstrating that chemical cues in the plankton have the potential to alter large-scale ecosystem processes including primary production and nutrient cycling.
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