The Hemiparasitic Plant Phtheirospermum (Orobanchaceae) Is Polyphyletic and Contains Cryptic Species in the Hengduan Mountains of Southwest China
Yu, Wen-Bin1,2; Randle, Christopher P.3; Lu, Lu4; Wang, Hong4; Yang, Jun-Bo5; depamphilis, Claude W.6; Corlett, Richard T.1; Li, De-Zhu5
2018-02-09
发表期刊FRONTIERS IN PLANT SCIENCE
ISSN1664-462X
卷号9期号:1页码:142
摘要

Phtheirospermum (Orobanchaceae), a hemiparasitic genus of Eastern Asia, is characterized by having long and viscous glandular hairs on stems and leaves. Despite this unifying character, previous phylogenetic analyses indicate that Phtheirospermum is polyphyletic, with Phtheirospermum japonicum allied with tribe Pedicularideae and members of the Ph. tenuisectum complex allied with members of tribe Rhinantheae. However, no analyses to date have included broad phylogenetic sampling necessary to test the monophyly of Phtheirospermum species, and to place these species into the existing subfamiliar taxonomic organization of Orobanchaceae. Two other genera of uncertain phylogenetic placement are Brandisia and Pterygiella, also both of Eastern Asia. In this study, broadly sampled phylogenetic analyses of nrITS and plastid DNA revealed hard incongruence between these datasets in the placement of Brandisia. However, both nrITS and the plastid datasets supported the placement of Ph. japonicum within tribe Pedicularideae, and a separate clade consisting of the Ph. tenuisectum complex and a monophyletic Pterygiella. Analyses were largely in agreement that Pterygiella, the Ptheirospermum complex, and Xizangia form a clade not nested within any of the monophyletic tribes of Orobanchaceae recognized to date. Ph. japonicum, a model species for parasitic plant research, is widely distributed in Eastern Asia. Despite this broad distribution, both nrITS and plastid DNA regions from a wide sampling of this species showed high genetic identity, suggesting that the wide species range is likely due to a recent population expansion. The Ph. tenuisectum complex is mainly distributed in the Hengduan Mountains region. Two cryptic species were identified by both phylogenetic analyses and morphological characters. Relationships among species of the Ph. tenuisectum complex and Pterygiella remain uncertain. Estimated divergence ages of the Ph. tenuisectum complex corresponding to the last two uplifts of the Qinghai-Tibet Plateau at around 8.0-7.0 Mya and 3.6-1.5 Mya indicated that the development of a hot-dry valley climate during these uplifts may have driven species diversification in the Ph. tenuisectum complex.

关键词Cryptic Species Hengduan Mountains Orobanchaceae Phtheirospermum Phylogenetic Incongruence Pterygiella
语种英语
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文献类型期刊论文
条目标识符http://ir.kib.ac.cn/handle/151853/60458
专题植物化学与西部植物资源持续利用国家重点实验室
作者单位1.Chinese Acad Sci, Ctr Integrat Conservat, Xishuangbanna Trop Bot Gar, Mengla, Peoples R China
2.Chinese Acad Sci, Southeast Asia Biodivers Res Inst, Yezin, Myanmar
3.Sam Houston State Univ, Dept Biol Sci, Huntsville, TX 77340 USA
4.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Kunming, Yunnan, Peoples R China
5.Chinese Acad Sci, Kunming Inst Bot, Plant Germplasm & Genom Ctr, Germplasm Bank Wild Species, Kunming, Yunnan, Peoples R China
6.Penn State Univ, Grad Program Plant Biol, Dept Biol, State Coll, PA USA
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Yu, Wen-Bin,Randle, Christopher P.,Lu, Lu,et al. The Hemiparasitic Plant Phtheirospermum (Orobanchaceae) Is Polyphyletic and Contains Cryptic Species in the Hengduan Mountains of Southwest China[J]. FRONTIERS IN PLANT SCIENCE,2018,9(1):142.
APA Yu, Wen-Bin.,Randle, Christopher P..,Lu, Lu.,Wang, Hong.,Yang, Jun-Bo.,...&Li, De-Zhu.(2018).The Hemiparasitic Plant Phtheirospermum (Orobanchaceae) Is Polyphyletic and Contains Cryptic Species in the Hengduan Mountains of Southwest China.FRONTIERS IN PLANT SCIENCE,9(1),142.
MLA Yu, Wen-Bin,et al."The Hemiparasitic Plant Phtheirospermum (Orobanchaceae) Is Polyphyletic and Contains Cryptic Species in the Hengduan Mountains of Southwest China".FRONTIERS IN PLANT SCIENCE 9.1(2018):142.
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