Journal of Zhejiang University SCIENCE
(ISSN 1009-3095, Monthly)

2005   Vol. 6B   No. 2   p.87-90

Two ancient rounds of polyploidy in rice genome

ZHANG Yang¹, XU Guo-hua², GUO Xing-yi¹, FAN Long-jiang^*1,2

(¹Institute of Bioinformatics/ZJU-IBM Biocomputational Lab, ²Institute of Crop Science, Zhejiang University, Hangzhou 310029, China)
^*E-mail: fanlj@zju.edu.cn
Received Oct. 27, 2004; revision accepted Nov. 5, 2004

Abstract: 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.

Key words: Oryza sativa, Polyploidy, Genome evolution, Age distribution of duplicate genes, Monocot-dicot divergence
doi:10.1631/jzus.2005.B0087             CLC number: Q78