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A Malvaceae mystery: a mallow maelstrom of genome multiplications and maybe misleading methods?

Lookup NU author(s): Dr Kirsten Wolff, Dr Samuel Logan

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This is the authors' accepted manuscript of an article that has been published in its final definitive form by Wiley-Blackwell Publishing Asia, 2019.

For re-use rights please refer to the publisher's terms and conditions.


Abstract

Previous research suggests that Gossypium has undergone a 5- to 6-fold multiplication following its divergence from Theobroma. However, the number of events, or where they occurred in the Malvaceae phylogeny remain unknown. Here, we analyzed transcriptomic and genomic data from representatives of eight of the nine Malvaceae subfamilies. Phylogenetic analysis of nuclear data placed Dombeya (Dombeyoideae) as sister to the rest of Malvadendrina clade, but the plastid DNA tree strongly support Durio (Helicteroideae) in this position. Intraspecific Ks plots indicate that all sampled taxa except Theobroma (Byttnerioideae), Corchorus (Grewioideae), and Dombeya (Dombeyoideae) have experienced whole genome multiplications (WGMs). Quartet analysis suggests WGMs were shared by Mavloideae-Bombacoideae and Sterculioideae-Tilioideae, but did not resolve whether these are shared with each other or with Helicteroideae (Durio). Gene tree reconciliation and Bayesian concordance analysis suggest a complex history. Alternative hypotheses are suggested, each involving two independent autotetraploid and one allopolyploid event. They differ in that one suggests an allopolyploid origin for the Durio lineage, whereas the other suggests an allopolyploid origin for Mavloideae-Bombacoideae. We highlight the need for more genomic information in Malvaceae and improved methods to resolve complex evolutionary histories that may include allopolyploidy, incomplete lineage sorting, and variable rates of gene evolution.


Publication metadata

Author(s): Conover JL, Karimi N, Stenz N, Ane C, Grover CE, Skema C, Tate JA, Wolff K, Logan SA, Wendel JF, Baum DA

Publication type: Article

Publication status: Published

Journal: Journal of Integrative Plant Biology

Year: 2019

Volume: 61

Issue: 1

Pages: 12-31

Print publication date: 01/01/2019

Online publication date: 26/11/2018

Acceptance date: 05/11/2018

Date deposited: 14/11/2018

ISSN (print): 1672-9072

ISSN (electronic): 1744-7909

Publisher: Wiley-Blackwell Publishing Asia

URL: https://doi.org/10.1111/jipb.12746

DOI: 10.1111/jipb.12746


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