Close split of sorghum and maize genome progenitors

Zuzana Swigoňová, Jinsheng Lai, Jianxin Ma, Wusirika Ramakrishna, Victor Llaca, Jeffrey L. Bennetzen, Joachim Messing

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342 Scopus citations


It is generally believed that maize (Zea mays L. ssp. mays) arose as a tetraploid; however, the two progenitor genomes cannot be unequivocally traced within the genome of modern maize. We have taken a new approach to investigate the origin of the maize genome. We isolated and sequenced large genomic fragments from the regions surrounding five duplicated loci from the maize genome and their orthologous loci in sorghum, and then we compared these sequences with the orthologous regions in the rice genome. Within the studied segments, we identified 11 genes that were conserved in location, order, and orientation. We performed phylogenetic and distance analyses and examined the patterns of estimated times of divergence for sorghum and maize gene orthologs and also the time of divergence for maize orthologs. Our results support a tetraploid origin of maize. This analysis also indicates contemporaneous divergence of the ancestral sorghum genome and the two maize progenitor genomes about 11.9 million years ago (Mya). On the basis of a putative conversion event detected for one of the genes, tetraploidization must have occurred before 4.8 Mya, and therefore, preceded the major maize genome expansion by gene amplification and retrotransposition.

Original languageEnglish (US)
Pages (from-to)1916-1923
Number of pages8
JournalGenome research
Issue number10 A
StatePublished - Oct 2004

All Science Journal Classification (ASJC) codes

  • Genetics
  • Genetics(clinical)


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