Determination of the melon chloroplast and mitochondrial genome sequences reveals that the largest reported mitochondrial genome in plants contains a significant amount of DNA having a nuclear origin

Table 4 C. melo mitochondrial genome characteristics

Total scaffold/contig size [nt]	2,738,402
GC content	44.5%
Gene number ^a	78
Protein genes^a	51
rRNA genes^a	3
tRNA genes^a	24
Genes with introns	10
Trans-spliced genes	3
Coding sequence	1.68%
Protein coding	1.37%
tRNAs and rRNAs	0.31%
Non-coding sequence	98.32%
*cis* -spliced introns	1.80%
Intergenic sequences	96.53%
Repetitive content
SSRs	0.15%
Transposable-related sequences	0.24%
Any perfect repeats	42.70%
Tandem repeats	1.51%
Inverted repeats	1.85%
Mitochondrial-like ^b	4.4%
Chloroplast-like ^c	1.41%
Nuclear-like ^d	46.47%

^aDuplicated and triplicated genes (see Table 5) were counted once
^bHomologous regions between C. melo, C. lanatus and C. pepo mitochondrial genomes
^cHomologous regions between C. melo mitochondrial and chloroplast genomes
^dHomologous regions between C. melo nuclear and mitochondrial genomes

ISSN: 1471-2164