Small-Scale Duplications Play a Significant Role in Rice Genome Evolution

Abstract

Abstract: Genes are continually being created by the processes of genome duplication (ohnolog) and gene duplication (paralog). Whole-genome duplications have been found to be widespread in plant species and play an important role in plant evolution. Clearly un-overlapping duplicated blocks of whole-genome duplications can be detected in the genome of sequenced rice (Oryza sativa). Syntenic ohnolog pairs (ohnologues) of the whole-genome duplications in rice were identified based on their syntenic duplicate lines. The paralogs of ohnologues were further scanned using multi-round reciprocal BLAST best-hit searching (E<e-14). The results indicated that an average of 0.55 sister paralogs could be found for every ohnologue in rice. These results suggest that small-scale duplications, as well as whole-genome duplications, play a significant role in the two duplicated rice genomes.

Key words: small-scale duplication, ohnologue, genome evolution, Oryza sativa, Arabidopsis

GUO Xin-yi, XU Guo-hua, ZHANG Yang, HU Wei-min, FAN Long-jiang. Small-Scale Duplications Play a Significant Role in Rice Genome Evolution[J]. RICE SCIENCE, 2005, 12(3): 173-178 .

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