Phylogeny and biogeography of the genus Stevia (Asteraceae: Eupatorieae): an example of diversification in the Asteraceae in the new world

Akiko Soejima, Akifumi S. Tanabe, Izumi Takayama, Takayuki Kawahara, Kuniaki Watanabe, Miyuki Nakazawa, Misako Mishima, Tetsukazu Yahara

研究成果: Contribution to journalArticle査読

7 被引用数 (Scopus)

抄録

The genus Stevia comprises approximately 200 species, which are distributed in North and South America, and are representative of the species diversity of the Asteraceae in the New World. We reconstructed the phylogenetic relationships using sequences of ITS and cpDNA and estimated the divergence times of the major clade of this genus. Our results suggested that Stevia originated in Mexico 7.0–7.3 million years ago (Mya). Two large clades, one with shrub species and another with herb species, were separated at about 6.6 Mya. The phylogenetic reconstruction suggested that an ancestor of Stevia was a small shrub in temperate pine–oak forests and the evolutionary change from a shrub state to a herb state occurred only once. A Brazilian clade was nested in a Mexican herb clade, and its origin was estimated to be 5.2 Mya, suggesting that the migration from North America to South America occurred after the formation of the Isthmus of Panama. The species diversity in Mexico appears to reflect the habitat diversity within the temperate pine–oak forest zone. The presence of many conspecific diploid–polyploid clades in the phylogenetic tree reflects the high frequency of polyploidization among the perennial Stevia species.

本文言語英語
ページ(範囲)953-972
ページ数20
ジャーナルJournal of Plant Research
130
6
DOI
出版ステータス出版済み - 11 1 2017

All Science Journal Classification (ASJC) codes

  • Plant Science

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