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Evolutionary transcriptomics reveals the origins of olives and the genomic changes associated with their domestication
Univ Montpellier, Montpellier SupAgro, INRA, CIRAD,AGAP, Montpellier, France;NYUAD, Ctr Genom & Syst Biol, Abu Dhabi, U Arab Emirates.ORCID iD: 0000-0002-2587-3946
CNRS UPS IRD, UMR5174, Lab EDB, Toulouse, France.ORCID iD: 0000-0003-2275-6012
Univ Montpellier, Montpellier SupAgro, INRA, CIRAD,AGAP, Montpellier, France.
Univ Montpellier, Montpellier SupAgro, INRA, CIRAD,AGAP, Montpellier, France.
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2019 (English)In: The Plant Journal, ISSN 0960-7412, E-ISSN 1365-313X, Vol. 100, no 1, p. 143-157Article in journal (Refereed) Published
Abstract [en]

The olive (Olea europaea L. subsp. europaea) is one of the oldest and most socio-economically important cultivated perennial crop in the Mediterranean region. Yet, its origins are still under debate and the genetic bases of the phenotypic changes associated with its domestication are unknown. We generated RNA-sequencing data for 68 wild and cultivated olive trees to study the genetic diversity and structure both at the transcription and sequence levels. To localize putative genes or expression pathways targeted by artificial selection during domestication, we employed a two-step approach in which we identified differentially expressed genes and screened the transcriptome for signatures of selection. Our analyses support a major domestication event in the eastern part of the Mediterranean basin followed by dispersion towards the West and subsequent admixture with western wild olives. While we found large changes in gene expression when comparing cultivated and wild olives, we found no major signature of selection on coding variants and weak signals primarily affected transcription factors. Our results indicated that the domestication of olives resulted in only moderate genomic consequences and that the domestication syndrome is mainly related to changes in gene expression, consistent with its evolutionary history and life history traits.

Place, publisher, year, edition, pages
WILEY , 2019. Vol. 100, no 1, p. 143-157
Keywords [en]
artificial selection, differential expression analysis, domestication, Olea europaea (olive tree), perennial crop, RNA-sequencing, transcriptomics
National Category
Evolutionary Biology Genetics
Identifiers
URN: urn:nbn:se:uu:diva-396142DOI: 10.1111/tpj.14435ISI: 000477186700001PubMedID: 31192486OAI: oai:DiVA.org:uu-396142DiVA, id: diva2:1367655
Available from: 2019-11-04 Created: 2019-11-04 Last updated: 2019-11-04Bibliographically approved

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Gros-Balthazard, MurielBesnard, GuillaumeLeclercq, JulieWegmann, DanielGlemin, Sylvain
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