NUCLEAR PHYLOGENY AND ALLOPOLYPLOIDIZATION IN OTACHYRIINAE

REINHEIMER R; ZULOAGA F; ACOSTA JM

SYSTEMATICS AND BIODIVERSITY

CAMBRIDGE UNIV PRESS

Lugar: Cambridge; Año: 2019

1477-2000

Otachyriinae Butzin, one of the three subtribes within the Paspaleae tribe, consists in seven genera and approximately 35 species. Interestingly, the subtribe includes species with C3, C3-C4 intermediates, and C4 photosynthesis. The circumscription of Otachyriinae has changed through time, and still varies among treatments in current use. The monophyly of this subtribe has been recovered in previous studies based on plastid markers. A phylogenetic study taking into account polyploidy and a low-copy nuclear gene (LCNG) is still lacking in Paspaleae. Given the high rates of polyploidy in Paspaleae, a re-analysis of its phylogeny with LCNG is paramount to uncover reticulated evolution within the group. The purpose of the present study was a reconstruction of the evolutionary history of Otachyriinae, based in both chloroplast and LCNG with a focus on polyploidizations. We identify nine possible allopolyploidizations events. Also, the molecular sampling in this study improves our understanding of the reticulation events within all major clades, and clarifies the taxonomic affiliations of Panicum species with historically ambiguous placements.