Temporal fitness fluctuations in experimental Arabidopsis thaliana populations

Jinyong Hu, Li Lei, Juliette De Meaux

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Understanding the genetics of lifetime fitness is crucial to understand a species' ecological preferences and ultimately predict its ability to cope with novel environmental conditions. Yet, there is a dearth of information regarding the impact of the ecological variance experienced by natural populations on expressed phenotypic and fitness differences. Here, we follow the natural dynamics of experimental A. thaliana populations over 5 successive plantings whose timing was determined by the natural progression of the plant's life cycle and disentangle the environmental and genetic factors that drive plant ecological performance at a given locality. We show that, at the temperate latitude where the experiment was conducted, a given genotype can experience winter-, spring- or summer-annual life cycles across successive seasons. Lifetime fitness across these seasons varied strongly, with a fall planting yielding 36-fold higher fitness compared to a spring planting. In addition, the actual life-stage at which plant overwinter oscillated across years, depending on the timing of the end of the summer season. We observed a rare but severe fitness differential coinciding with inadequate early flowering in one of the five planting. Substrate variation played a comparatively minor role, but also contributed to modulate the magnitude of fitness differentials between genotypes. Finally, reciprocal introgressions on chromosome 4 demonstrated that the fitness effect of a specific chromosomal region is strongly contingent on micro-geographic and seasonal fluctuations. Our study contributes to emphasize the extent to which the fitness impact of phenotypic traits and the genes that encode them in the genome can fluctuate. Experiments aiming at dissecting the molecular basis of local adaptation must apprehend the complexity introduced by temporal fluctuations because they massively affect the expression of phenotype and fitness differences.

Original languageEnglish (US)
Article numbere0178990
JournalPloS one
Volume12
Issue number6
DOIs
StatePublished - Jun 2017

Bibliographical note

Funding Information:
We thank Hildegard Schwitte for her help in quantifying fitness in the 4 and 5 plantings. This research was supported by the Deutsche Forschung Gesellschaft (DFG) in the realm of SFB680, and by the European Research Council with Grant 648617 “AdaptoSCOPE”. The raw phenotypic data presented in this experiment is available upon request. th th

Publisher Copyright:
© 2017 Hu et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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