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• W2969343321 endingPage "106601" @default.
• W2969343321 startingPage "106601" @default.
• W2969343321 abstract "The Cornales is a relatively small but morphologically diverse order in the basal position of the Asterids clade. Previous study hypothesized that the order might have undergone ancient rapid radiation during the Cretaceous when major angiosperm lineages were established. We conducted the phylogenomic analysis of Cornales using 81 plastid genome sequences with 67 newly generated in this study to test the hypothesis. This sampling represents all the families and 31 out of 48 genera in the order. Phylogenetic analyses were conducted using different datasets to examine the effects of different coding positions and character coding methods. We further conducted divergence time, diversification rate, and biogeographic analyses to understand the early evolutionary history of Cornales in space and time. Our phylogenetic analyses of four datasets (the amino acid characters, the 1st and 2nd codon positions of protein coding genes, nucleotide characters with degenerated coding method, and noncoding regions) resulted in a robust phylogeny congruent with results of previous studies, showing (((Cornaceae-Alangiaceae)-(Curtisiaceae-Grubbiaceae))-(((Nyssaceae-Davidiaceae)-Mastixiaceae)-((Hydrostachyaceae-(Hydrangeaceae-Loasaceae)))). Phylogenetic relationships within families were also well resolved. Conflicts in the placement of Hydrostachyaceae were found from analyses of two datasets, the nucleotide characters of all codon position and the 3rd codon positions, where the family was united with Loasaceae, but not strongly supported. Results from divergence time analyses suggested a mid-Cretaceous origin of Cornales followed by rapid early diversification into major clades/families within 10 million years. The early diversification of Cornales may have been facilitated by divergence in habitat and morphology following geographic dispersals. The ancestral distribution of the order was inferred as a widespread range covering Asia, Europe, North America, and Africa when including fossils in the analyses, suggesting an origin of the order likely along the Tethys Seaway where the areas were connected in the mid-Cretaceous. Inferred geographic origins of each family differed to some extent between analyses including fossils vs excluding fossils. In the analysis with extant and fossil species, the origins of the African Hydrostachyaceae and Grubbiaceae-Curtisiaceae clade were inferred to have involved two independent events, an intercontinental dispersal from the northern hemisphere to Africa and an intercontinental vicariance between the northern hemisphere and Africa, respectively. Other families were inferred to have evolved in the northern hemisphere with subsequent intercontinental dispersal(s) to other areas including to Central and South America, during their subsequent diversification. Net diversification rate analysis based on treePL dated phylogeny using MEDUSA detected a nearly 5-fold decrease in the African endemic Curtisiaceae-Grubbiaceae (CuG) clade and an increase of rate in the Hydrangeaceae-Loasaceae (HL) clade. Within HL, a decrease in the Fendlera-Jamesia clade and an increase in the Philadelphus clade were also detected. The findings are also consistent with the level of present species diversity in these lineages. Our study demonstrated the value of plastid genome in phylogenomic study, but posed an old challenge of biogeographic study with fossil data and raised caution for the synonymous substitution sites of plastid genome in phylogenomics studies." @default.
• W2969343321 created "2019-08-29" @default.
• W2969343321 creator A5002509297 @default.
• W2969343321 creator A5028652883 @default.
• W2969343321 creator A5029474379 @default.
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• W2969343321 creator A5047719026 @default.
• W2969343321 creator A5065768949 @default.
• W2969343321 creator A5069884912 @default.
• W2969343321 date "2019-11-01" @default.
• W2969343321 modified "2023-10-14" @default.
• W2969343321 title "Plastid phylogenomics and biogeographic analysis support a trans-Tethyan origin and rapid early radiation of Cornales in the Mid-Cretaceous" @default.
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