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Title: Changes in Population Age-Structure Obscure the Temperature-Size Rule in Marine Cyanobacteria
Authors: Palacio, Antonio S.; Cabello, Ana Maria; Garcia, Francisca C. and Labban, Abbrar; Moran, Xose Anxelu G.; Garczarek, Laurence and Alonso-Saez, Laura; Lopez-Urrutia, Angel
Abstract: The temperature-size Rule (TSR) states that there is a negative relationship between ambient temperature and body size. This rule has been independently evaluated for different phases of the life cycle in multicellular eukaryotes, but mostly for the average population in unicellular organisms. We acclimated two model marine cyanobacterial strains (Prochlorococcus marinusMIT9301 andSynechococcus sp.RS9907) to a gradient of temperatures and measured the changes in population age-structure and cell size along their division cycle. Both strains displayed temperature-dependent diel changes in cell size, and as a result, the relationship between temperature and average cell size varied along the day. We computed the mean cell size of new-born cells in order to test the prediction of the TSR on a single-growth stage. Our work reconciles previous inconsistent results when testing the TSR on unicellular organisms, and shows that when a single-growth stage is considered the predicted negative response to temperature is revealed.
Keywords: temperature-size rule; Prochlorococcus; Synechococcus; cell size; temperature; cell division; cell cycle; CELL-CYCLE REGULATION; GROWTH-RATE; DIEL PATTERNS; SYNECHOCOCCUS; PROCHLOROCOCCUS; DIVISION; DISTRIBUTIONS; PICOPLANKTON; PHYTOPLANKTON; PROKARYOTE
Issue Date: 2020
Type: Article
DOI: 10.3389/fmicb.2020.02059
ISSN: 1664-302X
Funder: Spanish Ministry of Economy and Competitiveness (MINECO) [RYC-2012-11404, BES2015076149]
TECCAM project [CTM2014-58564-R]
ANRFrench National Research Agency (ANR) [ANR-17-CE2-0014-01]
Appears in Publication types:Artículos científicos

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