Molecular phylogeny reveals the non-monophyly of tribe Yinshanieae (Brassicaceae) and description of a new tribe, Hillielleae

Hongliang Chen; Tao Deng; Jipei Yue; Ihsan A Al-Shehbaz; Hang Sun

doi:10.1016/j.pld.2016.04.004

Molecular phylogeny reveals the non-monophyly of tribe Yinshanieae (Brassicaceae) and description of a new tribe, Hillielleae

Plant Divers. 2016 Sep 5;38(4):171-182. doi: 10.1016/j.pld.2016.04.004. eCollection 2016 Aug.

Authors

Hongliang Chen^{1

2}, Tao Deng¹, Jipei Yue¹, Ihsan A Al-Shehbaz³, Hang Sun¹

Affiliations

¹ Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, Yunnan 650201, China.
² University of Chinese Academy of Sciences, Beijing 100049, China.
³ Missouri Botanical Garden, P.O. Box 299, St. Louis, MO, 63166-0299, USA.

Abstract

The taxonomic treatment within the unigeneric tribe Yinshanieae (Brassicaceae) is controversial, owing to differences in generic delimitation applied to its species. In this study, sequences from nuclear ITS and chloroplast trnL-F regions were used to test the monophyly of Yinshanieae, while two nuclear markers (ITS, ETS) and four chloroplast markers (trnL-F, trnH-psbA, rps16, rpL32-trnL) were used to elucidate the phylogenetic relationships within the tribe. Using maximum parsimony, maximum likelihood, and Bayesian inference methods, we reconstructed the phylogeny of Brassicaceae and Yinshanieae. The results show that Yinshanieae is not a monophyletic group, with the taxa splitting into two distantly related clades: one clade contains four taxa and falls in Lineage I, whereas the other includes all species previously placed in Hilliella and is embedded in the Expanded Lineage II. The tribe Yinshanieae is redefined, and a new tribe, Hillielleae, is proposed based on combined evidence from molecular phylogeny, morphology, and cytology.

Keywords: Brassicaceae; Hilliella; Hillielleae; Phylogeny; Yinshania; Yinshanieae.