Phylogenetic reconstruction of the rainforest lineage Fontainea heckel (Euphorbiaceae) based on chloroplast DNA sequences and reduced-representation SNP Markers

Brunton Aaron J., Lamont Robert W., Conroy Gabriel C., Yap Samantha, Rossetto Maurizio, Taylor-Brown Alyce, Maggia Laurent, Reddell Paul, Ogbourne Steven M.. 2022. Phylogenetic reconstruction of the rainforest lineage Fontainea heckel (Euphorbiaceae) based on chloroplast DNA sequences and reduced-representation SNP Markers. Diversity, 14 (9):725, 17 p.

Résumé : Fontainea is a plant genus with nine recognised species that occur across the tropical and subtropical rainforests of Australia, Papua New Guinea, New Caledonia, and Vanuatu. One of these species is cultivated commercially as the source of a cancer therapeutic, and several other species are under threat of extinction. Despite this, the phylogenetic relationships of the genus have not been explored. Our study assessed the phylogeny of seven Fontainea taxa from the Australian and Pacific Island complex using chloroplast DNA sequence data and reduced-representation genome sequencing. Maximum-likelihood and consensus network trees were used to infer the topology of phylogenetic relationships between species, which highlighted three distinct lineages and a number of sister species. Our results indicated that the geographically disjunct species Fontainea venosa and F. pancheri formed a sister group at the earliest position of divergence for the genus. The data also revealed that the vulnerable Fontainea australis and the critically endangered F. oraria form a sister subclade with evidence of some shared plastid genotypes. Generally, our phylogenetic reconstruction supports the modern taxonomical nomenclature. However, we suggest further accessions across several species may support improved genetic distinctions between the sister groups of Fontainea within the genus.

Mots-clés Agrovoc : phylogénie, polymorphisme à nucléotide unique, lignée, analyse phylogénétique, phylogénétique, phylogéographie, relation interspécifique

Mots-clés complémentaires : Fontainea

Mots-clés libres : Molecular divergence, Phylogeography, Single nucleotide polymorphisms, Oncology, Natural product, Plastids, Rainforest evolution

Classification Agris : F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Auteurs et affiliations

• Brunton Aaron J., University of the Sunshine Coast (AUS) - auteur correspondant
• Lamont Robert W., University of the Sunshine Coast (AUS)
• Conroy Gabriel C., University of the Sunshine Coast (AUS)
• Yap Samantha, Royal Botanic Garden (AUS)
• Rossetto Maurizio, Royal Botanic Garden (AUS)
• Taylor-Brown Alyce, University of the Sunshine Coast (AUS)
• Maggia Laurent, CIRAD-BIOS-UMR AGAP (NCL) ORCID: 0000-0001-9975-9081
• Reddell Paul, Ecobiotics (AUS)
• Ogbourne Steven M., University of the Sunshine Coast (AUS)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/601924/)

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