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The acquisition of phototrophy : adaptive strategies of hosting endosymbionts and organelles

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dc.contributor.author Johnson, Matthew D.
dc.date.accessioned 2010-10-13T18:56:36Z
dc.date.available 2011-04-20T08:25:03Z
dc.date.issued 2010-04
dc.identifier.uri http://hdl.handle.net/1912/3943
dc.description Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Photosynthesis Research 107 (2011): 117-132, doi:10.1007/s11120-010-9546-8. en_US
dc.description.abstract Many non-photosynthetic species of protists and metazoans are capable of hosting viable algal endosymbionts or their organelles through adaptations of phagocytic pathways. A form of mixotrophy, acquired phototrophy (AcPh) encompasses a sweet of endosymbiotic and organelle retention interactions, that range from facultative to obligate. AcPh is a common phenomenon in aquatic ecosystems, with endosymbiotic associations generally more prevalent in nutrient poor environments, and organelle retention typically associated with more productive ones. All AcPhs benefit from enhanced growth due to access to photosynthetic products, however the degree of metabolic integration and dependency in the host varies widely. AcPhs are mixotrophic, using both heterotrophic and phototrophic carbon sources. AcPh is found in at least four of the major eukaryotic supergroups, and is the driving force in the evolution of secondary and tertiary plastid acquisitions. Mutualistic resource partitioning characterizes most algal endosymbiotic interactions, while organelle retention is a form of predation, characterized by nutrient flow (i.e. growth) in one direction. AcPh involves adaptations to recognize specific prey or endosymbionts and to house organelles or endosymbionts within the endomembrane system but free from digestion. In many cases, hosts depend upon AcPh for the production of essential nutrients, many of which remain obscure. The practice of AcPh has led to multiple independent secondary and tertiary plastid acquisition events among several eukaryote lineages, giving rise to the diverse array of algae found in modern aquatic ecosystems. This review highlights those AcPhs that are model research organisms for both metazoans and protists. Much of the basic biology of AcPhs remains enigmatic, particularly 1) which essential nutrients or factors make certain forms of AcPh obligatory, 2) how hosts regulate and manipulate endosymbionts or sequestered organelles, and 3) what genomic imprint, if any, AcPh leaves on non-photosynthetic host species. en_US
dc.description.sponsorship Supported by NSF grant OCE-0851269 en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.relation.uri http://dx.doi.org/10.1007/s11120-010-9546-8
dc.subject Acquired phototrophy en_US
dc.subject Mixotrophy en_US
dc.subject Kleptoplastidy en_US
dc.subject Karyoklepty en_US
dc.subject Endosymbiosis en_US
dc.title The acquisition of phototrophy : adaptive strategies of hosting endosymbionts and organelles en_US
dc.type Preprint en_US


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