Unveiling membrane thermoregulation strategies in marine picocyanobacteria

被引：16

作者：

Breton, Solene ^{[1
]}

Jouhet, Juliette ^{[2
]}

Guyet, Ulysse ^{[1
]}

Gros, Valerie ^{[2
]}

Pittera, Justine ^{[1
]}

Demory, David ^{[3
]}

Partensky, Frederic ^{[1
]}

Dore, Hugo ^{[1
]}

Ratin, Morgane ^{[1
]}

Marechal, Eric ^{[2
]}

Ngoc An Nguyen ^{[1
]}

Garczarek, Laurence ^{[1
]}

Six, Christophe ^{[1
]}

机构：

[1] Sorbonne Univ, CNRS, UMR Adaptat & Divers Milieu Marin AD2M 7144, Ecol Marine Plankton ECOMAP Team,SBR, F-29680 Roscoff, France

[2] Univ Grenoble Alpes, Lab Physiol Cellulaire & Vegetale, CNRS, UMR 5168,CEA,INRA,IRIG,CEA Grenoble, 17 Rue Martyrs, F-38000 Grenoble, France

[3] Georgia Inst Technol, Sch Biol, Atlanta, GA 30332 USA

来源：

NEW PHYTOLOGIST | 2020年 / 225卷 / 06期

关键词：

adaptation; cyanobacteria; marine Synechococcus; membrane lipids; temperature ecotype; SYNECHOCOCCUS ECOTYPES; PHOTOSYSTEM-II; PROCHLOROCOCCUS; TEMPERATURE; CYANOBACTERIA; PHOTOSYNTHESIS; FLUORESCENCE; GROWTH; LIGHT; OCEAN;

D O I：

10.1111/nph.16239

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

The wide latitudinal distribution of marine Synechococcus cyanobacteria partly relies on the differentiation of lineages adapted to distinct thermal environments. Membranes are highly thermosensitive cell components, and the ability to modulate their fluidity can be critical for the fitness of an ecotype in a particular thermal niche. We compared the thermophysiology of Synechococcus strains representative of major temperature ecotypes in the field. We measured growth, photosynthetic capacities and membrane lipidome variations. We carried out a metagenomic analysis of stations of the Tara Oceans expedition to describe the latitudinal distribution of the lipid desaturase genes in the oceans. All strains maintained efficient photosynthetic capacities over their different temperature growth ranges. Subpolar and cold temperate strains showed enhanced capacities for lipid monodesaturation at low temperature thanks to an additional, poorly regiospecific Delta 9-desaturase. By contrast, tropical and warm temperate strains displayed moderate monodesaturation capacities but high proportions of double unsaturations in response to cold, thanks to regiospecific Delta 12-desaturases. The desaturase genes displayed specific distributions directly related to latitudinal variations in ocean surface temperature. This study highlights the critical importance of membrane fluidity modulation by desaturases in the adaptive strategies of Synechococcus cyanobacteria during the colonization of novel thermal niches.

引用

页码：2396 / 2410

页数：15

共 57 条

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