Photoregulation in a kleptochloroplastidic Dinoflagellate, Dinophysis acuta

Per Juel Hansen; Karin Ojamäe; Terje Berge; Erik Christian Løvbjerg Trampe; Lasse T. Nielsen; Inga Lipps; Michael Kühl

doi:10.3389/fmicb.2016.00785

Photoregulation in a kleptochloroplastidic Dinoflagellate, Dinophysis acuta

Per Juel Hansen, Karin Ojamäe, Terje Berge, Erik Christian Løvbjerg Trampe, Lasse T. Nielsen, Inga Lipps, Michael Kühl

Marine Biology

22 Citations (Scopus)

82 Downloads (Pure)

Abstract

Some phagotrophic organisms can retain chloroplasts of their photosynthetic prey as so-called kleptochloroplasts and maintain their function for shorter or longer periods of time. Here we show for the first time that the dinoflagellate Dinophysis acuta takes control over "third-hand" chloroplasts obtained from its ciliate prey Mesodinium spp. that originally ingested the cryptophyte chloroplasts. With its kleptochloroplasts, D. acuta can synthesize photosynthetic as well as photoprotective pigments under long-term starvation in the light. Variable chlorophyll fluorescence measurements showed that the kleptochloroplasts were fully functional during 1 month of prey starvation, while the chlorophyll a-specific inorganic carbon uptake decreased within days of prey starvation under an irradiance of 100 μmol photons m^-2 s^-1. While D. acuta cells can regulate their pigmentation and function of kleptochloroplasts they apparently lose the ability to maintain high inorganic carbon fixation rates.

Original language	English
Article number	785
Journal	Frontiers in Microbiology
Volume	7
Number of pages	11
ISSN	1664-302X
DOIs	https://doi.org/10.3389/fmicb.2016.00785
Publication status	Published - 2016

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Hansen_2016_Photoregulation_in_a_kleptochloroplastidicFinal published version, 1.1 MBLicence: CC BY

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title = "Photoregulation in a kleptochloroplastidic Dinoflagellate, Dinophysis acuta",

abstract = "Some phagotrophic organisms can retain chloroplasts of their photosynthetic prey as so-called kleptochloroplasts and maintain their function for shorter or longer periods of time. Here we show for the first time that the dinoflagellate Dinophysis acuta takes control over {"}third-hand{"} chloroplasts obtained from its ciliate prey Mesodinium spp. that originally ingested the cryptophyte chloroplasts. With its kleptochloroplasts, D. acuta can synthesize photosynthetic as well as photoprotective pigments under long-term starvation in the light. Variable chlorophyll fluorescence measurements showed that the kleptochloroplasts were fully functional during 1 month of prey starvation, while the chlorophyll a-specific inorganic carbon uptake decreased within days of prey starvation under an irradiance of 100 μmol photons m-2 s-1. While D. acuta cells can regulate their pigmentation and function of kleptochloroplasts they apparently lose the ability to maintain high inorganic carbon fixation rates.",

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T1 - Photoregulation in a kleptochloroplastidic Dinoflagellate, Dinophysis acuta

AU - Hansen, Per Juel

AU - Ojamäe, Karin

AU - Berge, Terje

AU - Trampe, Erik Christian Løvbjerg

AU - Nielsen, Lasse T.

AU - Lipps, Inga

AU - Kühl, Michael

PY - 2016

Y1 - 2016

N2 - Some phagotrophic organisms can retain chloroplasts of their photosynthetic prey as so-called kleptochloroplasts and maintain their function for shorter or longer periods of time. Here we show for the first time that the dinoflagellate Dinophysis acuta takes control over "third-hand" chloroplasts obtained from its ciliate prey Mesodinium spp. that originally ingested the cryptophyte chloroplasts. With its kleptochloroplasts, D. acuta can synthesize photosynthetic as well as photoprotective pigments under long-term starvation in the light. Variable chlorophyll fluorescence measurements showed that the kleptochloroplasts were fully functional during 1 month of prey starvation, while the chlorophyll a-specific inorganic carbon uptake decreased within days of prey starvation under an irradiance of 100 μmol photons m-2 s-1. While D. acuta cells can regulate their pigmentation and function of kleptochloroplasts they apparently lose the ability to maintain high inorganic carbon fixation rates.

AB - Some phagotrophic organisms can retain chloroplasts of their photosynthetic prey as so-called kleptochloroplasts and maintain their function for shorter or longer periods of time. Here we show for the first time that the dinoflagellate Dinophysis acuta takes control over "third-hand" chloroplasts obtained from its ciliate prey Mesodinium spp. that originally ingested the cryptophyte chloroplasts. With its kleptochloroplasts, D. acuta can synthesize photosynthetic as well as photoprotective pigments under long-term starvation in the light. Variable chlorophyll fluorescence measurements showed that the kleptochloroplasts were fully functional during 1 month of prey starvation, while the chlorophyll a-specific inorganic carbon uptake decreased within days of prey starvation under an irradiance of 100 μmol photons m-2 s-1. While D. acuta cells can regulate their pigmentation and function of kleptochloroplasts they apparently lose the ability to maintain high inorganic carbon fixation rates.

U2 - 10.3389/fmicb.2016.00785

DO - 10.3389/fmicb.2016.00785

M3 - Journal article

C2 - 27303378

SN - 1664-302X

VL - 7

JO - Frontiers in Microbiology

JF - Frontiers in Microbiology

M1 - 785

ER -

Photoregulation in a kleptochloroplastidic Dinoflagellate, Dinophysis acuta

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