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Abstract Detail

Recent advances in phylogeny and systematics of Brassicaceae

Ma, Hong [1], Huang, Chien-Hsun [1], Sun, Renran [1], Hu, Yi [2], Zeng, Liping [1], Zhang, Ning [1], Cai, Liming [1], Edger, Patrick [3], Al-Shehbaz, Ihsan [4], Pires, J. Chris [5], Koch, Marcus [6], Tan, Dun-Yan [7].

Resolving Brassicaceae phylogeny using nuclear genes facilitates molecular clock estimates of major branches, character reconstruction and analysis of gene family evolution.

Brassicaceae is one of the most important plant families with both important crops and well-studied models. Recent phylogenies support a framework of three major lineages, but relationships between and within these lineages are still unclear. Nuclear genes are useful for phylogenetic reconstruction, but the available whole genome or transcriptome datasets in Brassicaceae are not sufficient. Here, we have generated new transcriptome datasets for 35 Brassicaceae species and obtained nuclear gene sequences from additional taxa, for a total of 57 species, representing 30 of 49 tribes. Gene markers were selected via three different approaches, resulting in a total of 113 genes, with further pruning after partitions with long-branch attraction or saturation analyses. Phylogeny was analyzed with the concatenation of selected genes, as well as the gene sets after the bias tests. All trees showed a similar topology with highly supported resolution of the deep relationships in the family, containing 6 major clades designated as A-F. Clade A contains the previously defined Lineage I and Macropodium nivale; Clade B contains tribes of Lineage II, several tribes that were included in the Expanded Lineage II and Schrenkiella parvula, and is sister to Clade C, which is composed of Iberis, Lobularia, Biscutella, Cochlearia and Lunaria, all of which were previously assigned to Expanded Lineage II; Clade D also contains several tribes of Expanded Lineage II; Clade E (Lineage III) is basal to Clades A to D, with Aethionemeae (Clade F) occupying the basalmost position of Brasscaceae. Relationships between the major clades were further supported the AU tests. The well resolved phylogeny provides a framework for additional evolutionary analysis, including gene family evolution, reconstruction of ancestral morphological characters, and molecular clock estimates of the origin of major branches of Brassicaceae. These results will be presented and their implications discussed.

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1 - Fudan University, Shanghai, 200438, China
2 - The Penn State University, University Park, PA, 16802, USA
3 - UC Berkeley, Berkeley, CA, 94720, USA
4 - Missouri Botanical Garden, P.O. Box 299, St. Louis, MO, MO, 631660299, USA
5 - University of Missouri, Columbia, MO, 65211, USA
6 - Heidelberg University, COS, Diversity and Plant Systematics, Im Neuenheimer Feld 345, Heidelberg, Germany
7 - Xingjiang Agricultural University, Urumqi, 830052, China

Molecular clock
Nuclear genes
Morphological characters

Presentation Type: Colloquium Presentations
Session: C2
Location: Salon 8/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 2:15 PM
Number: C2003
Abstract ID:388
Candidate for Awards:None

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