Abstract
The diploid D-genome lineage of the Triticum/Aegilops complex has an evolutionary history involving genomic contributions from ancient A- and B/S-genome species. We explored here the possible cytonuclear evolutionary responses to this history of hybridization. Phylogenetic analysis of chloroplast DNAs indicates that the D-genome lineage has a maternal origin of the A-genome or some other closely allied lineage. Analyses of the nuclear genome in the D-genome species Aegilops tauschii indicate that accompanying and/or following this ancient hybridization, there has been biased maintenance of maternal A-genome ancestry in nuclear genes encoding cytonuclear enzyme complexes (CECs). Our study provides insights into mechanisms of cytonuclear coevolution accompanying the evolution and eventual stabilization of homoploid hybrid species. We suggest that this coevolutionary process includes likely rapid fixation of A-genome CEC orthologs as well as biased retention of A-genome nucleotides in CEC homologs following population level recombination during the initial generations.
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The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 4
Claim · model-written summary
Chloroplast DNA phylogeny indicates maternal origin of the D-genome lineage from the A-genome or a closely allied lineage.
- Taxon
- Aegilops tauschii
.jpg?width=60)
Aegilops tauschiit0 - Outcome
- maternal origin of the A-genome or some other closely allied lineagee0
Not reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Phylogenetic analysis of chloroplast DNAs indicates that the D-genome lineage has a maternal origin of the A-genome or some other closely allied lineage.”
t0“Aegilops tauschii”
Claim · model-written summary
Nuclear genes encoding cytonuclear enzyme complexes show biased maintenance of maternal A-genome ancestry.
- Taxon
- Aegilops tauschiiAegilops tauschiie1
- Gene
- nuclear genes encoding cytonuclear enzyme complexes (CECs)e0
- Outcome
- biased maintenance of maternal A-genome ancestrye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there has been biased maintenance of maternal A-genome ancestry in nuclear genes encoding cytonuclear enzyme complexes (CECs)”
e1“Aegilops tauschii”
Claim · model-written summary
The authors suggest rapid fixation of A-genome CEC orthologs during cytonuclear coevolution.
- Taxon
- Aegilops tauschiiAegilops tauschiit0
- Gene
- A-genome CEC orthologse0
- Outcome
- rapid fixatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“likely rapid fixation of A-genome CEC orthologs”
t0“Aegilops tauschii”
Claim · model-written summary
The authors suggest biased retention of A-genome nucleotides in CEC homologs after initial population recombination.
- Taxon
- Aegilops tauschiiAegilops tauschiit0
- Gene
- CEC homologse0
- Outcome
- biased retention of A-genome nucleotidese0
- Qualifier
- following population level recombination during the initial generationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“biased retention of A-genome nucleotides in CEC homologs following population level recombination during the initial generations”
t0“Aegilops tauschii”