Ice melting can change DMSP production and photosynthetic activity of the haptophyte Phaeocystis antarctica

Journal of Phycology
Sohiko KameyamaKoji Suzuki

Abstract

Phaeocystis antarctica is an important primary producer in the Southern Ocean and plays roles in sulfur cycles through intracellular production of dimethylsulfoniopropionate (DMSP), a principal precursor of dimethyl sulfide (DMS). Haptophytes, including P. antarctica, are known to produce more DMSP than other phytoplankton groups such as diatoms and green algae, suggesting their important contribution to DMS concentrations in the Southern Ocean. We assessed how sea ice formation and melting affect photosynthesis and DMSP accumulation in P. antarctica both in seawater and in sea ice. Incubations were undertaken in an ice tank, which simulated sea ice formation and melting dynamics. The maximum quantum yield of photochemistry (Fv /Fm ) in photosystem II, as estimated from pulse-amplitude-modulated (PAM) fluorometry, was generally higher under low light conditions than high light. Values of Fv /Fm , the relative maximum electron rate (rETRmax ) and photosynthetic efficiency (α) were lower in sea ice than in seawater, implying reduced photosynthetic function inside the sea ice. The reduction in photosynthetic function was probably due to the hypersaline environment in the brine channels. Total DMSP (DMSPt) concentration normalized ...Continue Reading

References

Jul 10, 1999·Plant Physiology·T Leustek, K Saito
Nov 25, 2005·Photosynthesis Research·Markus Wirtz, Michel Droux
Sep 4, 2008·Proceedings. Biological Sciences·Kam W TangDavid T Elliott
Feb 23, 2019·Proceedings of the National Academy of Sciences of the United States of America·Robert F StrzepekWilliam G Sunda

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Citations

Jan 7, 2021·Microorganisms·María Estrella Alcamán-AriasBeatriz Díez

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