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Insights into the production and role of nitric oxide in the Antarctic sea-ice diatom Fragilariopsis cylindrus


Kennedy, F and Martin, A and McMinn, A, Insights into the production and role of nitric oxide in the Antarctic sea-ice diatom Fragilariopsis cylindrus, Journal of Phycology, 56, (5) pp. 1196-1207. ISSN 0022-3646 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 Phycological Society of America

DOI: doi:10.1111/jpy.13027


Nitric oxide (NO) is widely recognized as an important transmitter molecule in biological systems, from animals to plants and microbes. However, the role of NO in marine photosynthetic microbes remains unclear and even less is known about the role of this metabolite in Antarctic sea‐ice diatoms. Using a combination of microsensors, microfluidic chambers, and artificial sea‐ice tanks, a basic mechanistic insight into NO's dynamics within the Antarctic sea‐ice diatom Fragilariopsis cylindrus was obtained. Results suggest that NO production in F. cylindrus is nitrite‐dependent via nitrate reductase. NO production was abolished upon exposure to light but could be induced in the light when normal photosynthetic electron flow was disrupted. The addition of exogenous NO to cellular suspensions of F. cylindrus negatively influenced growth, disrupted photosynthesis, and altered non‐photochemical dissipation mechanisms. NO production was also observed when cells were exposed to stressful salinity and temperature regimes. These results suggest that during periods of environmental stress, NO could be produced in F. cylindrus as a "stress signa" molecule.

Item Details

Item Type:Refereed Article
Keywords:Antarctic, Fragilariopsis cylindrus, microelectrodes, microfluidics, nitric oxide, sea-ice
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Phycology (incl. marine grasses)
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Kennedy, F (Dr Fraser Kennedy)
UTAS Author:Martin, A (Dr Andrew Martin)
UTAS Author:McMinn, A (Professor Andrew McMinn)
ID Code:139728
Year Published:2020
Web of Science® Times Cited:6
Deposited By:Ecology and Biodiversity
Deposited On:2020-06-30
Last Modified:2022-07-06

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