5S-IGS rDNA in wind-pollinated trees (Fagus L.) encapsulates 55 million years of reticulate evolution and hybrid origins of modern species.
Fagus
5S rDNA
adaptation
genetic diversity
high-throughput sequencing
hybrid evolution
wind-pollination
Journal
The Plant journal : for cell and molecular biology
ISSN: 1365-313X
Titre abrégé: Plant J
Pays: England
ID NLM: 9207397
Informations de publication
Date de publication:
02 2022
02 2022
Historique:
revised:
02
11
2021
received:
17
02
2021
accepted:
18
11
2021
pubmed:
23
11
2021
medline:
9
3
2022
entrez:
22
11
2021
Statut:
ppublish
Résumé
Standard models of plant speciation assume strictly dichotomous genealogies in which a species, the ancestor, is replaced by two offspring species. The reality in wind-pollinated trees with long evolutionary histories is more complex: species evolve from other species through isolation when genetic drift exceeds gene flow; lineage mixing can give rise to new species (hybrid taxa such as nothospecies and allopolyploids). The multi-copy, potentially multi-locus 5S rDNA is one of few gene regions conserving signal from dichotomous and reticulate evolutionary processes down to the level of intra-genomic recombination. Therefore, it can provide unique insights into the dynamic speciation processes of lineages that diversified tens of millions of years ago. Here, we provide the first high-throughput sequencing (HTS) of the 5S intergenic spacers (5S-IGS) for a lineage of wind-pollinated subtropical to temperate trees, the Fagus crenata - F. sylvatica s.l. lineage, and its distant relative F. japonica. The observed 4963 unique 5S-IGS variants reflect a complex history of hybrid origins, lineage sorting, mixing via secondary gene flow, and intra-genomic competition between two or more paralogous-homoeologous 5S rDNA lineages. We show that modern species are genetic mosaics and represent a striking case of ongoing reticulate evolution during the past 55 million years.
Identifiants
pubmed: 34808015
doi: 10.1111/tpj.15601
pmc: PMC9299691
doi:
Substances chimiques
DNA, Intergenic
0
DNA, Ribosomal
0
RNA, Ribosomal, 5S
0
Banques de données
figshare
['10.6084/m9.figshare.16803481', '10.6084/m9.figshare.11603547']
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
909-926Informations de copyright
© 2021 The Authors. The Plant Journal published by Society for Experimental Biology and John Wiley & Sons Ltd.
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