首页|A likely paleo-autotetraploidization event shaped the high conservation of Nyssaceae genome
A likely paleo-autotetraploidization event shaped the high conservation of Nyssaceae genome
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Scientific knowledge about the ancestral genome of core eudicot plant kingdom can potentially have profound impacts on both basic and applied research,including evolution,genetics,genomics,ecology,agriculture,forestry,and global climate.To investigate which plant con-serves best the core eudicots common ancestor genome,we compared Arcto-Tertiary relict Nyssaceae and 30 other eudicot plant families.The genomes of Davidia involucrata(a known living fossil),Camptotheca acuminata and Nyssa sinensis,one per existent genus of Nyssaceae,were performed comparative genomic analysis.We found that Nyssaceae originated from a single Nyssaceae common tetraploidization event(NCT)-autotetraploidization 28-31 Mya after the core eudicot common hexaploidization(ECH).We identified Nyssaceae orthologous and paralogous genes,determined its chromosomal evolutionary trajectory,and reconstructed the Nyssaceae most recent ancestor genome.D.involucrata genome contained the entire seven paleochromosomes and 17 ECH-generated eudicot common ancestor chromosomes and was the slowest in mutation among the analyzed 42 species of 31 plant families.Combing both its high retention of paleochromosomes and its low mutation rate,D.involucrata provides the best case in conservation of the core eudicot paleogenome.
Department of Bioinformatics,School of Life Sciences,North China University of Science and Technology,Tangshan,Hebei 063000,China
Fredericton Research and Development Centre,Agriculture and Agri-Food Canada,Fredericton,New Brunswick E3B 4Z7,Canada
State Key Laboratory of Systematic and Evolutionary Botany,Institute of Botany,Chinese Academy of Science,Beijing 100093,China
University of Chinese Academy of Sciences,Beijing 100049,China
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