Phylogenetics of the paleartic model grass
Resumen: Brachypodium sylvaticum has been selected as a model for perennial grasses, and considerable genomic resources have been generated and a reference genome and several resequenced pangenome accessions are available for this species. Despite these genomic advances, the evolution and systematics of diploid B. sylvaticum s. l. is almost unknown. The B. sylvaticum complex is formed by up to seven taxonomically close micro-taxa which differentiate from typical B. sylvaticum s. s. based on a few morphological features. Moreover, some of them show some largely disjunct geographic distributions on both sides of their native Palearctic region. In this study, we used a phylogenomic approach including representative populations from the oriental and occidental distribution range of B. sylvaticum micro-taxa to elucidate their evolutionary relationships and assess the systematic value of the morphological features that separate them. A combined plastome and nuclear phylogenetic tree supports an early split and high divergence of the oriental lineage, showing the close relationship of the Himalayan B. sylvaticum var. breviglume lineages to the Pacific B. miserum / B. kurilense clade, and the contrasting large homogeneity and low divergence of the occidental European, N African and SW and C Asian lineage, with several B. sylvaticum s. s., B. spryginii, and B. glaucovirens samples showing identical or similar sequences. Divergence time estimate analysis suggests that the oriental lineage diverged from the common ancestor in the early Pleistocene (2.0 Ma), followed by subsequent colonization and isolations in the Himalayas (2.0 – 1.7 Ma) and the Far East (0.36 Ma) in more recent times, while the occidental lineage split in the Mid-Late Pleistocene (0.97 Ma), followed by rapid radiation and postglacial spread in the western Paleartic during the last thousand years.
Idioma: Inglés
DOI: 10.17581/bp.2023.12119
Año: 2023
Publicado en: Botanica Pacifica 12, 1 (2023), 21-28
ISSN: 2410-3713

Factor impacto CITESCORE: 1.4 - Ecology (Q3) - Ecology, Evolution, Behavior and Systematics (Q3) - Plant Science (Q3)

Factor impacto SCIMAGO: 0.252 - Ecology (Q3) - Plant Science (Q3) - Ecology, Evolution, Behavior and Systematics (Q4)

Financiación: info:eu-repo/grantAgreement/ES/DGA/LMP82-21
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2019-108195GB-I00
Financiación: info:eu-repo/grantAgreement/EUR/MICINN/TED2021-131073B-I00
Tipo y forma: Article (Published version)
Área (Departamento): Área Botánica (Dpto. CC.Agrar.y Medio Natural)

Creative Commons You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes.


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