Phylogenomic proof of Recurrent Demipolyploidization and Evolutionary Stalling of the "Triploid Bridge" in Arundo (Poaceae)

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Jike , W , Li , M , Zadra , N , Barbaro , E , Sablok , G , Bertorelle , G , Rota-Stabelli , O & Varotto , C 2020 , ' Phylogenomic proof of Recurrent Demipolyploidization and Evolutionary Stalling of the "Triploid Bridge" in Arundo (Poaceae) ' , International Journal of Molecular Sciences , vol. 21 , no. 15 , 5247 . https://doi.org/10.3390/ijms21155247

Title: Phylogenomic proof of Recurrent Demipolyploidization and Evolutionary Stalling of the "Triploid Bridge" in Arundo (Poaceae)
Author: Jike, Wuhe; Li, Mingai; Zadra, Nicola; Barbaro, Enrico; Sablok, Gaurav; Bertorelle, Giorgio; Rota-Stabelli, Omar; Varotto, Claudio
Contributor organization: Organismal and Evolutionary Biology Research Programme
Embryophylo
Date: 2020-08
Language: eng
Number of pages: 22
Belongs to series: International Journal of Molecular Sciences
ISSN: 1422-0067
DOI: https://doi.org/10.3390/ijms21155247
URI: http://hdl.handle.net/10138/321139
Abstract: Polyploidization is a frequent phenomenon in plants, which entails the increase from one generation to the next by multiples of the haploid number of chromosomes. While tetraploidization is arguably the most common and stable outcome of polyploidization, over evolutionary time triploids often constitute only a transient phase, or a "triploid bridge", between diploid and tetraploid levels. In this study, we reconstructed in a robust phylogenomic and statistical framework the evolutionary history of polyploidization inArundo, a small genus from the Poaceae family with promising biomass, bioenergy and phytoremediation species. Through the obtainment of 10 novel leaf transcriptomes forArundoand outgroup species, our results prove that recurrent demiduplication has likely been a major driver of evolution in this species-poor genus. Molecular dating further demonstrates that the species originating by demiduplication stalled in the "triploid bridge" for evolutionary times in the order of millions of years without undergoing tetratploidization. Nevertheless, we found signatures of molecular evolution highlighting some of the processes that accompanied the genus radiation. Our results clarify the complex nature ofArundoevolution and are valuable for future gene functional validation as well as reverse and comparative genomics efforts in theArundogenus and other Arundinoideae.
Subject: Arundogenus
chromosome number evolution
adaptive evolution
phylogenomics
molecular dating
polyplodization
ARUNDO-DONAX L.
MULTIPLE SEQUENCE ALIGNMENT
CHROMOSOME-NUMBER
MODEL SELECTION
ORIGIN
POLYPLOIDY
ACCURACY
POACEAE
RECONSTRUCTION
MECHANISMS
1182 Biochemistry, cell and molecular biology
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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