Figure 1

Size variation of the orthologous Orp regions of Oryza species. (A) Phylogeny of the Oryza species [adapted from [23]]. (B) Contraction/expansion of the Orp regions in O. nivara, O. glaberrima, O. punctata, O. australiensis, and O. brachyantha relative to the orthologous region in O. sativa. Dotted red lines connecting the O. sativa and sorghum regions mark two gene clusters interrupted by a hotspot of transposon insertions and genic rearrangements in O. sativa as previously described by Ma et al. 2005. Dotted dark lines mark the boundaries of the orthologous regions defined by anchoring BESs from other Oryza species to the O. sativa sequence of the Orp region.