A molecular phylogeny of Caraganeae (Leguminosae, Papilionoideae) reveals insights into new generic and infrageneric delimitations.
Based on sequence data of nuclear ITS and plastidmatK,trnL-FandpsbA-trnHmarkers, the phylogeny of the subtribes Caraganinae and Chesneyinae in tribe Caraganeae was inferred. The results support the monophyly of each of the subtribes. Within subtribes Caraganinae,CalophacaandHalimodendronare herein transferred intoCaraganato ensure its generic monophyly. The subtribe Chesneyinae is composed of four well-supported genera:Chesneya,Chesniella,GueldenstaedtiaandTibetia. Based on phylogenetic, morphological, distributional and habitat type evidence, the genusChesneyawas divided into three monophyletic sections: Chesneya sect. Chesneya, Chesneya sect. Pulvinatae and Chesneya sect. Spinosae.Chesneya macranthais herein transferred intoChesniella.Spongiocarpellais polyphyletic and its generic rank is not maintained. The position ofChesneyawas incongruent in the nuclear ITS and the plastid trees. A paternal chloroplast capture event via introgression is hypothesized for the origin ofChesneya, which is postulated to have involved the common ancestor ofChesniella(♂) and that of theGueldenstaedtia-Tibetia(GUT) clade (♀) as the parents.
Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, Guangdong 510650, P.R.China.
Lei
L
Duan
Agriculture School, Kunming University, Kunming, Yunnan 650204, P.R.China.
Xue
X
Yang
College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China.
Peiliang
P
Liu
Department of Botany, National Museum of Natural History, MRC 166, Smithsonian Institution, Washington DC, 20013-7012, U.S.A.
Gabriel
G
Johnson
Department of Botany, National Museum of Natural History, MRC 166, Smithsonian Institution, Washington DC, 20013-7012, U.S.A.
Jun
J
Wen
College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China.
Zhaoyang
Z
Chang
Caragana; Chesneya; Chesniella; chloroplast capture; generic delimitation; phylogeny