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Whole plastid genome-based phylogenomics supports an inner placement of the O. insectifera group rather than a basal position in the rapidly diversifying Ophrys genus (Orchidaceae)

Abstract : Whole plastid genome-based phylogenomics supports an inner placement of the O. insectifera group rather than a basal position in the rapidly diversifying Ophrys genus (Orchidaceae) Some lineages of the Orchid genus Ophrys exhibit among the highest diversification rates reported so far. As a consequence of a such intense and rapid evolution, the systematics and the taxonomy of this genus remains unclear. A hybrid assembly approach based-on long-and short-read genomic data allowed us to outperform classical methods to successfully assemble whole plastid genomes for two new Ophrys species: O. aymoninii and O. lutea. Along with three other previously Ophrys plastid genome sequences, we then reconstructed the first whole plastome-based molecular phylogeny including representatives of the three mains recognized Ophrys lineages. Our results support the placement of the O. insectifera clade as sister group of 'non-basal Ophrys' rather than a basal position. Our findings corroborate recent results obtained from genomic data (RAD-seq and transcriptomes) but contrast with previous ones. These results therefore confirm that molecular phylogenetic hypotheses based on a limited number of loci (e.g. nrITS, matK, rbcL) may have provided a biased picture of phylogenetic relationships within Ophrys and possibly other plant taxa.
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https://hal-univ-perp.archives-ouvertes.fr/hal-03375011
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Soumis le : mardi 12 octobre 2021 - 14:26:45
Dernière modification le : mercredi 17 novembre 2021 - 12:31:59

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Joris Bertrand, Anaïs Gibert, Christel Llauro, Olivier Panaud. Whole plastid genome-based phylogenomics supports an inner placement of the O. insectifera group rather than a basal position in the rapidly diversifying Ophrys genus (Orchidaceae). Botany Letters, Taylor & Francis, 2021, 168 (3), pp.452-457. ⟨10.1080/23818107.2021.1893216⟩. ⟨hal-03375011⟩

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