Physiological Responses and Altered Halocarbon Production in Phaeodactylum Tricornutum after Exposure to Polystyrene Microplastics

Lang, Xiao-Ping; He, Zhen; Yang, Gui-Peng; Dai, Ge

doi:10.2139/ssrn.4235133

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2024

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“…table 1). Consistent with reports that P. tricornutum is a halocarbon producer 41,42 , m/z 124.96, corresponding to ethyl bromide, was detected in the exponential phase. The well-studied VOCs acetone (m/z 59.05), acetaldehyde (m/z 45.03), and DMS (m/z 68.07) were also detected in the exponential phase (Fig.…”

Section: Resultssupporting

confidence: 91%

Volatile Organic Compound Specialists in the Phycosphere

Padaki,

Mayali,

Weber

et al. 2024

Preprint

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Labile dissolved organic carbon (LDOC) in the oceans accounts for ∼ ¼ of global photosynthesis and turns over with a half-life of about one day, fueling one of the largest engines of microbial heterotrophic production on the planet. Volatile organic compounds (VOCs) are poorly constrained components of LDOC. We detected 78 VOCs totaling 18.5 μM in cultures of the model diatomPhaeodactylum tricornutum, including hydrocarbons usually found in petroleum. In five individual cocultures with bacteria adapted to grow with this diatom, 1 to 66 VOCs were depleted. Two of the most active VOC consumers,MarinobacterandRoseibium,had more VOC oxidation genes, and attached to the diatom, suggesting VOC specialism. Diatom photosynthesis increased by up to 29% in the presence of VOC consumers, indicating that VOC consumption by heterotrophic bacteria in the phycosphere – a region of rapid organic carbon oxidation that surrounds phytoplankton cells – could impact global rates of primary production.

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Section: Resultssupporting

confidence: 91%