Figure 1.

Frequency of the Appearance of nupDNA Fragments throughout the Rice Chloroplast Genome.

The rice chloroplast genome was divided into 100-bp segments. The numbers of nupDNA fragments corresponding to individual segments are shown by histograms. The rice chloroplast genome is a double-stranded circular DNA molecule of 134.5 kb, which contains two copies of an identical 20.8-kb inverted repeat (IRa and IRb) separated by a large single-copy region (LSC; 80.6 kb) and a small single-copy region (SSC; 12.4 kb) (Sugiura, 1992), as is schematically illustrated in Figure 3. The circular map is linearized at the junction between IRa and the large single-copy region. The yellow boxes indicate the regions whose copies are found in the rice mitochondrial genome. The red line indicates the expected number of nupDNA fragments if they originated from throughout the chloroplast genome with equal frequency.