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TAXON

Plant Diversity and Resources

Journal of Systematics and Evolution

Volume 56 Issue 2, Pages 120£­128.

Published Online: 21 Dec. 2017

DOI: 10.1111/jse.12294

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Phylogenetic reconstruction of the genus Triptilion (Asteraceae, Nassauvieae) based on nuclear and chloroplast DNA sequences

Paola Jara-Arancio1,2*, Paula M. Vidal1, and Mary T. K. Arroyo 1,3

1Instituto de Ecolog¨ªa y Biodiversidad, Universidad de Chile, Las palmeras 3425, Ñuñoa, Santiago, Chile

2Departamento de Ciencias Biol¨®gicas y Departamento de Ecolog¨ªa y Biodiversidad, Universidad Andr¨¦s Bello, Rep¨²blica 275, Santiago, Chile

3Facultad de Ciencias, Universidad de Chile, Las palmeras 3425, Ñuñoa Santiago, Chile

Keywords: central Chile; life-form; paraphyletic; patagonia; Triptilion

Abstract:

The genus Triptilion is endemic to central Chile, the Mendoza Province and western Patagonia in Argentina. It is currently composed of seven species: T. achilleae, T. benaventii, T. berteroi, T. capillatum, T. cordifolium, T. gibbosum, and T. spinosum. The main objectives of this paper were to determine the phylogenetic relationships of species of Triptilion. We also traced the evolution of annual and perennial life-forms. Historically a close relationship has been described between genera Triptilion and Nassauvia. Phylogenetic analysis of the genus Triptilion and more closely related genera was undertaken using two nuclear (ITS, ETS) and two chloroplast (trnL-F, rpl32-trnL) markers. The topology of the Bayesian inference tree shows that the genus Triptilion is paraphyletic, because Nassauvia lagascae, the only representative of Nassauvia section Caloptilium grouped with T. achilleae, Clade I. The other species of Triptilion form two clades: Clade II composed of T. cordifolium and T. gibbosum and Clade III that includes T. benaventii, T. berteroi, T. capillatum, and T. spinosum. The genus Triptilion originated and diverged during the Miocene. The results of the life history reconstructions indicate that the common ancestor of Triptilion and Nassauvia was perennial. The annual habit appears to be derived in Triptilion. The life-form of the common ancestor of Triptilion was ambiguous; it may have been annual or perennial.

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