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PLANT GENOME EVOLUTION

A non-duplicated magnoliid genome

Nature Plants volume 7, pages 1162–1163 (2021)Cite this article

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The genome of a magnoliid, Aristolochia fimbriata, shows no evidence of whole-genome duplication, a feature uniquely shared with Amborella trichopoda, the sister species to all other angiosperms. This ancestral structure of the Aristolochia genome offers great opportunities for comparative genomics.

Whereas WGDs have great potential for evolutionary innovation, they also complicate the structural and evolutionary analysis of genomes. WGDs are usually followed by massive genome rearrangements during the process of rediploidization, as recently shown in a comparison between the ‘unduplicated’ genome of the gnetophyte Gnetum montanum and the genome of Welwitschia mirabilis, which underwent a WGD7. Genomes such as the one of Gnetum (for gymnosperms) and the ones of Aristolochia and Amborella (for angiosperms) are considered to represent a more ancestral state that can be used to unravel the evolution and genome duplication history of other species. For instance, using the more conserved, ancestral structure of the Aristolochia genome, Qin et al. show that black pepper (Piper nigrum) has undergone three — not one, as originally reported8 — polyploidy events. Also, by using the Aristolochia genome as a reference, Qin et al. were able to identify new WGDs in Piperales and more accurately determine the timing of previously proposed WGDs in Laurales and Magnoliales.

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Fig. 1: Phylogenetic tree showing some key angiosperms and known WGDs.

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Author information

Affiliations

  1. Department of Plant Biotechnology and Bioinformatics, Ghent University and VIB Center for Plant Systems Biology, Ghent, Belgium

    Zhen Li & Yves Van de Peer

  2. College of Horticulture, Academy for Advanced Interdisciplinary Studies, Nanjing Agricultural University, Nanjing, China

    Yves Van de Peer

  3. Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa

    Yves Van de Peer

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  1. Zhen Li
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  2. Yves Van de Peer
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Correspondence to Yves Van de Peer.

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Li, Z., Van de Peer, Y. A non-duplicated magnoliid genome. Nat. Plants 7, 1162–1163 (2021). https://doi.org/10.1038/s41477-021-00989-9

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