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Autogenous Theories for the Origin of Eukaryotes

F. J. R. Taylor
Taxon
Vol. 25, No. 4 (Aug., 1976), pp. 377-390
DOI: 10.2307/1220521
Stable URL: http://www.jstor.org/stable/1220521
Page Count: 14
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Autogenous Theories for the Origin of Eukaryotes
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Abstract

After a brief resumé of the principal alternatives the author concludes that the only reasonable hypothesis for the fully autogenous development of the eukaryotes is that involving a cyanophyte-like photosynthetic ancestor: the "Uralga." A structurally explicit scenario for the internal events necessary to produce general eukarotic organisation within that framework is outlined. Central to the model is the progressive differentiation of membrane systems, leading to enclosure of specialised, double-membraned metabolic compartments by engulfment during the stage in which endo- and exocytotic properties were attained. Some minor differences between this model and that of Cavalier-Smith (1975) are discussed. The paper concludes with some comments about hypotheses involving endosymbiosis, including the virtues of a compromise hypothesis in which mitochondria arose autogenously, but chloroplasts arose by endosymbiosis.

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