Fustier, Margaux-Alison ORCID: 0000-0002-1348-6164, Martinez-Ainsworth, Natalia E., Aguirre-Liguori, Jonas A., Venon, Anthony ORCID: 0000-0002-2398-1353, Corti, Helene, Rousselet, Agnes, Dumas, Fabrice, Dittberner, Hannes, Camarena, Maria G., Grimanelli, Daniel ORCID: 0000-0001-5424-114X, Ovaskainen, Otso, Falque, Matthieu, Moreau, Laurence, de Meaux, Juliette, Montes-Hernandez, Salvador, Eguiarte, Luis E., Vigouroux, Yves, Manicacci, Domenica and Tenaillon, Maud, I (2019). Common gardens in teosintes reveal the establishment of a syndrome of adaptation to altitude. PLoS Genet., 15 (12). SAN FRANCISCO: PUBLIC LIBRARY SCIENCE. ISSN 1553-7404

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Abstract

In plants, local adaptation across species range is frequent. Yet, much has to be discovered on its environmental drivers, the underlying functional traits and their molecular determinants. Genome scans are popular to uncover outlier loci potentially involved in the genetic architecture of local adaptation, however links between outliers and phenotypic variation are rarely addressed. Here we focused on adaptation of teosinte populations along two elevation gradients in Mexico that display continuous environmental changes at a short geographical scale. We used two common gardens, and phenotyped 18 traits in 1664 plants from 11 populations of annual teosintes. In parallel, we genotyped these plants for 38 micro-satellite markers as well as for 171 outlier single nucleotide polymorphisms (SNPs) that displayed excess of allele differentiation between pairs of lowland and highland populations and/or correlation with environmental variables. Our results revealed that phenotypic differentiation at 10 out of the 18 traits was driven by local selection. Trait covariation along the elevation gradient indicated that adaptation to altitude results from the assembly of multiple co-adapted traits into a complex syndrome: as elevation increases, plants flower earlier, produce less tillers, display lower stomata density and carry larger, longer and heavier grains. The proportion of outlier SNPs associating with phenotypic variation, however, largely depended on whether we considered a neutral structure with 5 genetic groups (73.7%) or 11 populations (13.5%), indicating that population stratification greatly affected our results. Finally, chromosomal inversions were enriched for both SNPs whose allele frequencies shifted along elevation as well as phenotypically-associated SNPs. Altogether, our results are consistent with the establishment of an altitudinal syndrome promoted by local selective forces in teosinte populations in spite of detectable gene flow. Because elevation mimics climate change through space, SNPs that we found underlying phenotypic variation at adaptive traits may be relevant for future maize breeding.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Fustier, Margaux-AlisonUNSPECIFIEDorcid.org/0000-0002-1348-6164UNSPECIFIED
Martinez-Ainsworth, Natalia E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aguirre-Liguori, Jonas A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Venon, AnthonyUNSPECIFIEDorcid.org/0000-0002-2398-1353UNSPECIFIED
Corti, HeleneUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rousselet, AgnesUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dumas, FabriceUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dittberner, HannesUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Camarena, Maria G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grimanelli, DanielUNSPECIFIEDorcid.org/0000-0001-5424-114XUNSPECIFIED
Ovaskainen, OtsoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Falque, MatthieuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moreau, LaurenceUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
de Meaux, JulietteUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Montes-Hernandez, SalvadorUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eguiarte, Luis E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vigouroux, YvesUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Manicacci, DomenicaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tenaillon, Maud, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-125120
DOI: 10.1371/journal.pgen.1008512
Journal or Publication Title: PLoS Genet.
Volume: 15
Number: 12
Date: 2019
Publisher: PUBLIC LIBRARY SCIENCE
Place of Publication: SAN FRANCISCO
ISSN: 1553-7404
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SPATIAL GENETIC-STRUCTURE; LOCAL ADAPTATION; NATURAL-SELECTION; POPULATION-STRUCTURE; DIVERGENT SELECTION; ADAPTIVE DIVERGENCE; DETECTING SELECTION; FLOWERING TIME; GENOME-SCAN; MAIZEMultiple languages
Genetics & HeredityMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/12512

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