Comparative Analysis of Paleopolyploidy Evolution in Genomes of Setaria italica and Zea mays
ZHANG Qiong
WANG Zhen-yi
MA Xue-lian
NIE Lin-man
WANG Hou-long
WANG Jin-peng
Abstract：Based on the comparative genomics and the improved homologous gene collinearity method ,the genomic structure and gene homology information of C4 plant Setaria italica and Zea mays were comparatively analyzed in order to determine the doubled scale of genomes and the evolution law of polyploidy .The result showed that 3 846 pairs of paralogs (10.9% ) in Setaria italica genome and 6 016 pairs of paralogs (18.5% ) in Zea mays genome were generated by whole-genome duplication(WGD) ,and 13 652 pairs of orthologs were identified between them . The analysis of synonymous nucleotide substitution rate between homologous colinear genes indicated that Zea mays and Setaria italica shared an ancient WGD ,and a maize-specific WGD event occurred 12 million years ago .The duplicated genes often distributed near the ends of chromosomes .The analysis of genome evolution showed that the gene evolution rate was 1/14 faster in Zea mays than in Setaria italica .
Keywords：Setaria italicaZea mayspaleopolyploidypuplicated genesgene collinearity
Publication Date：2014-06-02
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 10-15 )