Most Compositae (Asteraceae) are descendants of a paleohexaploid and all share a paleotetraploid ancestor with the Calyceraceae

被引:78
作者
Barker, Michael S. [1 ]
Li, Zheng [1 ]
Kidder, Thomas I. [1 ]
Reardon, Chris R. [1 ]
Lai, Zhao [2 ,3 ]
Oliveira, Luiz O. [4 ]
Scascitelli, Moira [5 ,6 ]
Rieseberg, Loren H. [2 ,3 ,5 ,6 ]
机构
[1] Univ Arizona, Dept Ecol & Evolutionary Biol, POB 210088, Tucson, AZ 85721 USA
[2] Indiana Univ, Dept Biol, Bloomington, IN 47405 USA
[3] Indiana Univ, Ctr Genom & Bioinformat, Bloomington, IN 47405 USA
[4] Univ Fed Vicosa, Dept Bioquim & Biol Mol, BR-36570900 Vicosa, MG, Brazil
[5] Univ British Columbia, Dept Bot, Vancouver, BC V6T 1Z4, Canada
[6] Univ British Columbia, Biodivers Res Ctr, Vancouver, BC V6T 1Z4, Canada
基金
美国国家科学基金会;
关键词
compositae; asteraceae; calyceraceae; whole genome duplication; polyploidy; paleopolyploidy; transcriptome; MULTIPLE SEQUENCE ALIGNMENT; ANCIENT EVOLUTIONARY SPLIT; CHLOROPLAST DNA INVERSIONS; MITOCHONDRIAL GENE CONTENT; GENOME DUPLICATIONS; PHYLOGENETIC ANALYSIS; DIVERSIFICATION; POLYPLOIDY; SPECIATION; RATES;
D O I
10.3732/ajb.1600113
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
PREMISE OF THE STUDY: Like many other flowering plants, members of the Compositae (Asteraceae) have a polyploid ancestry. Previous analyses found evidence for an ancient duplication or possibly triplication in the early evolutionary history of the family. We sought to better place this paleopolyploidy in the phylogeny and assess its nature. METHODS: We sequenced new transcriptomes for Barnadesia, the lineage sister to all other Compositae, and four representatives of closely related families. Using a recently developed algorithm, MAPS, we analyzed nuclear gene family phylogenies for evidence of paleopolyploidy. KEY RESULTS: We found that the previously recognized Compositae paleopolyploidy is also in the ancestry of the Calyceraceae. Our phylogenomic analyses uncovered evidence for a successive second round of genome duplication among all sampled Compositae except Barnadesia. CONCLUSIONS: Our analyses of new samples with new tools provide a revised view of paleopolyploidy in the Compositae. Together with results from a high density Lactuca linkage map, our results suggest that the Compositae and Calyceraceae have a common paleotetraploid ancestor and that most Compositae are descendants of a paleohexaploid. Although paleohexaploids have been previously identified, this is the first example where the paleotetraploid and paleohexaploid lineages have survived over tens of millions of years. The complex polyploidy in the ancestry of the Compositae and Calyceraceae represents a unique opportunity to study the long-term evolutionary fates and consequences of different ploidal levels.
引用
收藏
页码:1203 / 1211
页数:9
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