Cytonuclear coevolution following homoploid hybrid speciation in Aegilops tauschii

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2018-01-01
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Li, Changping
Sun, Xuhan
Conover, Justin
Zhang, Zhibin
Wang, Jinbin
Wang, Xiaofei
Deng, Xin
Wang, Hongyan
Liu, Bao
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Wendel, Jonathan
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Ecology, Evolution and Organismal Biology

The Department of Ecology, Evolution, and Organismal Biology seeks to teach the studies of ecology (organisms and their environment), evolutionary theory (the origin and interrelationships of organisms), and organismal biology (the structure, function, and biodiversity of organisms). In doing this, it offers several majors which are codirected with other departments, including biology, genetics, and environmental sciences.

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The Department of Ecology, Evolution, and Organismal Biology was founded in 2003 as a merger of the Department of Botany, the Department of Microbiology, and the Department of Zoology and Genetics.

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2003–present

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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 indicate 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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This is a manuscript of an article published as Li, Changping, Xuhan Sun, Justin L. Conover, Zhibin Zhang, Jinbin Wang, Xiaofei Wang, Xin Deng et al. "Cytonuclear coevolution following homoploid hybrid speciation in Aegilops tauschii." Molecular biology and evolution (2018). doi: 10.1093/molbev/msy215.

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Mon Jan 01 00:00:00 UTC 2018
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