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Size evolution in microorganisms masks trade-offs predicted by the growth rate hypothesis.
Gounand, Isabelle; Daufresne, Tanguy; Gravel, Dominique; Bouvier, Corinne; Bouvier, Thierry; Combe, Marine; Gougat-Barbera, Claire; Poly, Franck; Torres-Barceló, Clara; Mouquet, Nicolas.
Afiliação
  • Gounand I; Institut des Sciences de l'Evolution de Montpellier, CNRS, IRD, EPHE, Faculté des Sciences de Montpellier, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France isabelle.gounand@eawag.ch.
  • Daufresne T; Département de Biologie, Université du Québec à Rimouski, Rimouski, Canada.
  • Gravel D; Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland.
  • Bouvier C; Eawag, Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, 8600 Dübendorf, Switzerland.
  • Bouvier T; INRA -UMR Eco&Sols - Bat 12, 2 Place Viala, 34060 Montpellier cedex 1, France.
  • Combe M; Département de Biologie, Université du Québec à Rimouski, Rimouski, Canada.
  • Gougat-Barbera C; MARBEC (MARine Biodiversity Exploitation and Conservation), UMR IRD-CNRS-UM-IFREMER 9190, Université Montpellier, CC 093, 34095 Montpellier Cedex 5, France.
  • Poly F; MARBEC (MARine Biodiversity Exploitation and Conservation), UMR IRD-CNRS-UM-IFREMER 9190, Université Montpellier, CC 093, 34095 Montpellier Cedex 5, France.
  • Torres-Barceló C; Institut des Sciences de l'Evolution de Montpellier, CNRS, IRD, EPHE, Faculté des Sciences de Montpellier, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France.
  • Mouquet N; UMR MIVEGEC IRD-CNRS-Université de Montpellier, Centre IRD de Montpellier, Montpellier, France.
Proc Biol Sci ; 283(1845)2016 12 28.
Article em En | MEDLINE | ID: mdl-28003453
Adaptation to local resource availability depends on responses in growth rate and nutrient acquisition. The growth rate hypothesis (GRH) suggests that growing fast should impair competitive abilities for phosphorus and nitrogen due to high demand for biosynthesis. However, in microorganisms, size influences both growth and uptake rates, which may mask trade-offs and instead generate a positive relationship between these traits (size hypothesis, SH). Here, we evolved a gradient of maximum growth rate (µmax) from a single bacterium ancestor to test the relationship among µmax, competitive ability for nutrients and cell size, while controlling for evolutionary history. We found a strong positive correlation between µmax and competitive ability for phosphorus, associated with a trade-off between µmax and cell size: strains selected for high µmax were smaller and better competitors for phosphorus. Our results strongly support the SH, while the trade-offs expected under GRH were not apparent. Beyond plasticity, unicellular populations can respond rapidly to selection pressure through joint evolution of their size and maximum growth rate. Our study stresses that physiological links between these traits tightly shape the evolution of competitive strategies.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Pseudomonas fluorescens / Adaptação Fisiológica / Evolução Biológica Idioma: En Ano de publicação: 2016 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Pseudomonas fluorescens / Adaptação Fisiológica / Evolução Biológica Idioma: En Ano de publicação: 2016 Tipo de documento: Article