The Chimonanthus salicifolius genome provides insight into magnoliid evolution and flavonoid biosynthesis.

The Plant Journal : for Cell and Molecular Biology
Qundan LvKe-Jun Cheng

Abstract

Chimonanthus salicifolius, a member of the Calycanthaceae of magnoliids, is one of the most famous medicinal plants in Eastern China. Here, we report a chromosome-level genome assembly of C. salicifolius, comprising 820.1 Mb of genomic sequence with a contig N50 of 2.3 Mb and containing 36 651 annotated protein-coding genes. Phylogenetic analyses revealed that magnoliids were sister to the eudicots. Two rounds of ancient whole-genome duplication were inferred in the C. salicifolious genome. One is shared by Calycanthaceae after its divergence with Lauraceae, and the other is in the ancestry of Magnoliales and Laurales. Notably, long genes with > 20 kb in length were much more prevalent in the magnoliid genomes compared with other angiosperms, which could be caused by the length expansion of introns inserted by transposon elements. Homologous genes within the flavonoid pathway for C. salicifolius were identified, and correlation of the gene expression and the contents of flavonoid metabolites revealed potential critical genes involved in flavonoids biosynthesis. This study not only provides an additional whole-genome sequence from the magnoliids, but also opens the door to functional genomic research and molecular breeding of C....Continue Reading

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Citations

Apr 2, 2021·Horticulture Research·Tangchun ZhengQixiang Zhang
Jun 25, 2021·Plant Physiology and Biochemistry : PPB·Xinqiao Zhan, Yingpeng Tong
Sep 4, 2021·Nature Plants·Zhen Li, Yves Van de Peer

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