Two ancient rounds of polyploidy in rice genome

J Zhejiang Univ Sci B. 2005 Feb;6(2):87-90. doi: 10.1631/jzus.2005.B0087.


An ancient genome duplication (PPP1) that predates divergence of the cereals has recently been recognized. We report here another potentially older large-scale duplication (PPP2) event that predates monocot-dicot divergence in the genome of rice (Oryza sativa L.), as inferred from the age distribution of pairs of duplicate genes based on recent genome data for rice. Our results suggest that paleopolyploidy was widespread and played an important role in the evolution of rice.

Publication types

  • Letter
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biological Evolution
  • Chromosome Mapping / methods*
  • Evolution, Molecular*
  • Genetic Variation / genetics
  • Genome, Plant*
  • Oryza / genetics*
  • Polyploidy*