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Clarifying Recent Adaptive Diversification of the Chrysanthemum-Group on the Basis of an Updated Multilocus Phylogeny of Subtribe Artemisiinae (Asteraceae: Anthemideae)
Understanding the roles played by geography and ecology in driving species diversification and in the maintenance of species cohesion is the central objective of evolutionary and ecological studies. The multi-phased orogenesis of Qinghai-Tibetan Plateau (QTP) and global climate changes over late-Mio...
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Published in: | Frontiers in plant science 2021-05, Vol.12, p.648026-648026 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Understanding the roles played by geography and ecology in driving species diversification and in the maintenance of species cohesion is the central objective of evolutionary and ecological studies. The multi-phased orogenesis of Qinghai-Tibetan Plateau (QTP) and global climate changes over late-Miocene has profoundly influenced the environments and evolution of organisms in this region and the vast areas of Asia. In this study, we investigate the lineage diversification of
Chrysanthemum
-group in subtribe Artemisiinae (tribe Anthemideae, Asteraceae) likely under the effects of climate changes during this period. Using DNA sequences of seven low-copy nuclear loci and nrITS and the coalescent analytical methods, a time-calibrated phylogeny of subtribe Artemisiinae was reconstructed with emphasis on
Chrysanthemum
-group. The monophyletic
Chrysanthemum-
group was well resolved into two major clades corresponding to
Chrysanthemum
and
Ajania
, two genera which can be well identified by capitulum morphology but have been intermingled in previous plastid and ITS trees. Within
Chrysanthemum
, a later divergence between
Ch. indicum
-complex and
Ch. zawadskii
-complex can be recognized. The time frames of these sequential divergences coincide with the late Cenozoic uplift of the Northern QTP and the concomitant climatic heterogeneity between eastern and inland Asia. Reconstruction of historical biogeography suggested the origin of
Chrysanthemum
-group in Central Asia, followed by eastward migration of
Chrysanthemum
and
in situ
diversification of
Ajania
. Within
Chrysanthemum
,
Ch. indicum
-complex and
Ch. zawadskii
-complex exhibited contemporary distributional division, the former in more southern and the latter in more northern regions. The geographic structure of the three lineages in
Chrysanthemum
-group have been associated with the niche differentiation, and environmental heterogenization in Asia interior. |
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ISSN: | 1664-462X 1664-462X |
DOI: | 10.3389/fpls.2021.648026 |