Universidad Complutense de Madrid
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Major evolutionary transitions of life, metabolic scaling and the number and size of mitochondria and chloroplasts

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Okie, Jordan G. y Smith, Val H. y Martín-Cereceda, Mercedes (2016) Major evolutionary transitions of life, metabolic scaling and the number and size of mitochondria and chloroplasts. Proceedings of the Royal Society B: Biological Sciences, 283 (1831). pp. 1-8. ISSN 0962-8452, ESSN: 1471-2954

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URL Oficial: http://rspb.royalsocietypublishing.org/content/283/1831/20160611



Resumen

We investigate the effects of trophic lifestyle and two types of major evolutionary transitions in individuality—the endosymbiotic acquisition of organelles and development of multicellularity—on organellar and cellular metabolism and allometry. We develop a quantitative framework linking the size and metabolic scaling of eukaryotic cells to the abundance, size and metabolic scaling of mitochondria and chloroplasts and analyse a newly compiled, unprecedented database representing unicellular and multicellular cells covering diverse phyla and tissues. Irrespective of cellularity, numbers and total volumes of mitochondria scale linearly with cell volume, whereas chloroplasts scale sublinearly and sizes of both organelles remain largely invariant with cell size. Our framework allows us to estimate the metabolic scaling exponents of organelles and cells. Photoautotrophic cells and organelles exhibit photosynthetic scaling exponents always less than one, whereas chemoheterotrophic cells and organelles have steeper respiratory scaling exponents close to one. Multicellularity has no discernible effect on the metabolic scaling of organelles and cells. In contrast, trophic lifestyle has a profound and uniform effect, and our results suggest that endosymbiosis fundamentally altered the metabolic scaling of free-living bacterial ancestors of mitochondria and chloroplasts, from steep ancestral scaling to a shallower scaling in their endosymbiotic descendants.


Tipo de documento:Artículo
Palabras clave:Cell allometry; Endosymbiosis, Organelle size, Metabolic theory of ecology, Multicellularity, Kleiber’s law
Materias:Ciencias Biomédicas > Biología > Fisiología vegetal
Ciencias Biomédicas > Biología > Microbiología
Código ID:42334
Depositado:26 Abr 2017 10:02
Última Modificación:10 Dic 2018 15:30

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