Phylogeny, origin and dispersal of Saussurea (Asteraceae) based on chloroplast genome data
2019
Abstract
Saussureais one of the largest genera of the tribe Cardueae of
Asteraceae, comprising about 460 species from the Northern Hemisphere with most species distributed in QTPss and adjacent areas. Here, we established a well-supported phylogenetic framework for
Saussureabased on whole chloroplast genomes of 136 taxa plus 16 additional taxa of Cardueae using
Bayesian inferenceand Maximum Likelihood. Our phylogenetic results are inconsistent with previous subgeneric classifications of
Saussurea. We nearly completely delimited subgen. Eriocoryne, and found that subgen. Theodorea, subgen.
Saussureasection Laguranthera and Rosulascentes are closely related to each other. Based on our phylogenetic results, we performed biogeographic analyses and inferred that the genus
Saussureaarose during early-middle Miocene within the Hengduan Mountains. We expect that landscape heterogeneity within the QTPss and adjacent areas, such as the Hengduan Mountains, played an important role in the evolution of
Saussurea. Following its evolutionary origin, the genus underwent rapid diversification in situs and dispersed northwards in several migrational patterns. Both continuous uplift of the QTPss and adjacent areas as well as
global coolingsince mid-Miocene probably led to geographic expansion and diffusion of
Saussurea, with the latter, in particular, resulting in the northward dispersal.
Keywords:
-
Correction
-
Source
-
Cite
-
Save
100
References
13
Citations
NaN
KQI