Figure 2.

Tandemly duplicated gene family formed through multiple rounds of segmental duplications. Genomic segments containing Gene 29 experienced three rounds of duplication, which led to the formation of the Gene 29 tandemly duplicated gene cluster. Subsequently, gene members were randomly deleted in some species after divergence among the genus Oryza during this evolutionary course. Gene 29 in O. brachyantha, which is estimated to have separated from Oryza sativa ~10 MYA, still maintains the ancient copy of Gene 29, and no amplifications or deletions were detected in this genome. OJ: O. sativa ssp. japonica, OP: O. punctata, OM_B: BB subgenome in O. minuta, OM_C: CC subgenome in O. minuta and OO: O. officinalis.