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A cryptic species produced by autopolyploidy and subsequent introgression involving Medicago prostrata (Fabaceae)

Artikel i vetenskaplig tidskrift
Författare Jonna S. Eriksson
J. L. Blanco-Pastor
Filipe de Sousa
Yann Bertrand
Bernard E. Pfeil
Publicerad i Molecular Phylogenetics and Evolution
Volym 107
Sidor 367–381
ISSN 1055-7903
Publiceringsår 2017
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 367–381
Språk en
Länkar dx.doi.org/10.1016/j.ympev.2016.11....
Ämnesord hybridisation; homoploid hybrid speciation; gene capture; next-generation sequencing; coalescent simulations; polyploid speciation
Ämneskategorier Botanik, Biologisk systematik, Evolutionsbiologi

Sammanfattning

Although hybridisation through genome duplication is well known, hybridisation without genome duplication (homoploid hybrid speciation, HHS) is not. Few well-documented cases have been reported. A possible instance of HHS in Medicago prostrata Jacq. was suggested previously, based on only two genes and one individual. We tested whether this species was formed through HHS by sampling eight nuclear loci and 22 individuals, with additional individuals from related species, using gene capture and Illumina sequencing. Phylogenetic inference and coalescent simulations were performed to infer the causes of gene tree incongruence. We found no evidence that phylogenetic differences among M. prostrata individuals were the result of HHS. Instead, an autopolyploid origin of tetraploids with introgression from tetraploids of the M. sativa complex is likely. We argue that tetraploid M. prostrata individuals constitute a new species, characterised by a partially non-overlapping distribution and distinctive alleles (from the M. sativa complex). No gene flow from tetraploid to diploid M. prostrata is apparent, suggesting partial reproductive isolation. Thus, speciation via autopolyploidy appears to have been reinforced by introgression. This raises the intriguing possibility that introgressed alleles may be responsible for the increased range exploited by tetraploid M. prostrata with respect to that of the diploids.

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