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231224s2011 xx |||||o 00| ||eng c |
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|a 10.1111/j.1529-8817.2010.00954.x
|2 doi
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|a eng
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|a Moeller, Holly V
|e verfasserin
|4 aut
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|a PHOTOACCLIMATION IN THE PHOTOTROPHIC MARINE CILIATE MESODINIUM RUBRUM (CILIOPHORA)(1)
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|c 2011
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a Date Completed 30.03.2016
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|a Date Revised 29.03.2016
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2011 Phycological Society of America.
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|a Mesodinium rubrum (=Myrionecta rubra), a marine ciliate, acquires plastids, mitochondria, and nuclei from cryptophyte algae. Using a strain of M. rubrum isolated from McMurdo Sound, Antarctica, we investigated the photoacclimation potential of this trophically unique organism at a range of low irradiance levels. The compensation growth irradiance for M. rubrum was 0.5 μmol quanta · m(-2) · s(-1) , and growth rate saturated at ∼20 μmol quanta · m(-2) · s(-1) . The strain displayed trends in photosynthetic efficiency and pigment content characteristic of marine phototrophs. Maximum chl a-specific photosynthetic rates were an order of magnitude slower than temperate strains, while growth rates were half as large, suggesting that a thermal limit to enzyme kinetics produces a fundamental limit to cell function. M. rubrum acclimates to light- and temperature-limited polar conditions and closely regulates photosynthesis in its cryptophyte organelles. By acquiring and maintaining physiologically viable, plastic plastids, M. rubrum establishes a selective advantage over purely heterotrophic ciliates but reduces competition with other phototrophs by exploiting a very low-light niche
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|a Journal Article
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|a Geminigera cryophila
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|a Mesodinium rubrum
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|a Myrionecta rubra
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|a ciliate
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|a karyoklepty
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|a light limitation
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|a photoacclimation
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|a quantum yield for growth
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|a Johnson, Matthew D
|e verfasserin
|4 aut
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|a Falkowski, Paul G
|e verfasserin
|4 aut
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|i Enthalten in
|t Journal of phycology
|d 1966
|g 47(2011), 2 vom: 29. Apr., Seite 324-32
|w (DE-627)NLM098182994
|x 1529-8817
|7 nnns
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| 773 |
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|g volume:47
|g year:2011
|g number:2
|g day:29
|g month:04
|g pages:324-32
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