Evolutionary patterns in the antR-Cor gene in the dwarf dogwood complex (Cornus, Cornaceae) |
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Authors: | Fan Chuanzhu Xiang Qiu-Yun Jenny Remington David L Purugganan Michael D Wiegmann Brian M |
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Institution: | (1) Department of Botany, North Carolina State University, Raleigh, NC 27695-7612, USA;(2) Department of Ecology and Evolution, University of Chicago, 1101 East 57th Street, Chicago, IL 60637, USA;(3) Department of Biology, University of North Carolina at Greensboro, Greensboro, NC 27402-6174, USA;(4) Department of Genetics, North Carolina State University, Raleigh, NC 27695-7614, USA;(5) Department of Entomology, North Carolina State University, Raleigh, NC 27695-7613, USA |
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Abstract: | The evolutionary pattern of the myc-like anthocyanin regulatory gene antR-Cor was examined in the dwarf dogwood species complex (Cornus Subgenus Arctocrania) that contains two diploid species (C. canadensis and C. suecica), their putative hybrids with intermediate phenotypes, and a tetraploid derivative (C. unalaschkensis). Full-length sequences of this gene (∼4 kb) were sequenced and characterized for 47 dwarf dogwood samples representing all
taxa categories from 43 sites in the Pacific Northwest. Analysis of nucleotide diversity indicated departures from neutral
evolution, due most likely to local population structure. Neighbor-joining and haplotype network analyses show that sequences
from the tetraploid and diploid intermediates are much more strongly diverged from C. suecica than from C. canadensis, and that the intermediate phenotypes may represent an ancestral group to C. canadensis rather than interspecific hybrids. Seven amino acid mutations that are potentially linked to myc-like anthocyanin regulatory
gene function correlate with petal colors differences that characterize the divergence between two diploid species and the
tetraploid species in this complex. The evidence provides a working hypothesis for testing the role of the gene in speciation
and its link to the petal coloration. Sequencing and analysis of additional nuclear genes will be necessary to resolve questions
about the evolution of the dwarf dogwood complex. |
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Keywords: | Cornus Gene evolution Hybridization Myc-like anthocyanin regulatory gene Nucleotide polymorphism Polyploid Speciation |
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