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Enlarge Image From Johnson (2011b): DNA and RNA labeling of Mesodinium rubrum to reveal the cryptophycean and ciliate nuclei. A. A dividing cell with each daughter cell containing two macronuclei (Mac), the micronucleus undergoing karyokinesis, and only one daughter cell possessing a karyokleptic nucleus (KN) acquired from its cryptophyte prey, Geminigera cryophila. The cell is stained with the general nucleic acid stain DAPI; B. Two M. rubrum cells dual labeled with in situ hybridization probes for the M. rubrum (pink; cy- 5) and G. cryophila (green; FITC) SSU rRNA genes.
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Enlarge Image From Johnson (2011a): Images of the acquired phototrophs: the foraminifera Orbulina universa with endosymbiotic dinoflagellates (a), the cnidarian Chlorohydra with endosymbiotic Chlorella in its endoderm tissue (b), the oligotrich ciliate Strombidium sp. (perhaps S. oculatum) with green algal plastids (c), a kleptoplastidic dinoflagellate from the Ross Sea with Phaeocystis antarctica organelles (d), and the sea slug Elysia chlorotica with plastids from Vaucheria litorea (e).
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| Related Files |
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| Journal Articles
Johnson MD (2011b) Acquired phototrophy in ciliates: a review of cellular interactions and structural adaptations. JEM doi: 10.1111/j.1550-7408.2011.00545.x
Moeller, HV, Johnson, MD, Falkowski, PG (2011) Photoacclimation in the phototrophic marine ciliate, Mesodinium rubrum (Ciliophora). J Phycol 47(2): 324-332
Johnson MD (2011a) The acquisition of phototrophy: adaptive strategies of hosting endosymbionts and organelles. Photosynth Res 107: 117-132
Stoecker DK, Johnson MD, de Vargas C, Not, F (2009) Acquired phototrophy in aquatic protists. Aquat Microb Ecol. 57: 279-310
Johnson MD, Volker J, Moeller HV, Laws E, Breslauer KJ, Falkowski PG (2009) Universal constant for heat production in protists. PNAS 106: 6696-6699
Johnson MD, Oldach D, Delwiche, CF, Stoecker DK, (2007) Retention of transcriptionally active cryptophyte nuclei by the ciliate Myrionecta rubra. Nature 445: 426-428
Johnson MD, Stoecker DK, Tengs T, Oldach D (2006) Sequestration and performance of cryptophyte plastids in Myrionecta rubra. J Phycol 42: 1236-1246
Johnson MD, Stoecker DK (2005) The role of feeding in growth and the photophysiology of Myrionecta rubra. Aquat Microb Ecol. 39: 303-312
Johnson MD, Tengs T, Oldach D, Stoecker DK (2004) Highly divergent SSU rRNA genes found in the marine ciliates Myrionecta rubra and Mesodinium pulex. Protist 155: 347-359
Johnson MD, Rome M, Stoecker DK (2003) Microzooplankton grazing on Prorocentrum minimum and Karlodinium micrum in Chesapeake Bay. Limnol Oceanogr 48: 238-248
Gustafson Jr. DE, Stoecker DK, Johnson MD, Van Heukelem WF, Sneider K (2000) Cryptophyte algae are robbed of their organelles by the marine ciliate Mesodinium rubrum. Nature 405: 1049-1052
Last updated: November 27, 2012 | 
