Abstract
During plant evolution, there is genetic communication between organelle and nuclear genomes. A comparative analysis was performed on the organelle and nuclear genomes of the watermelon and melon. In the watermelon, chloroplast-derived sequences accounted for 7.6% of the total length of the mitochondrial genome. In the melon, chloroplast-derived sequences accounted for approximately 2.73% of the total mitochondrial genome. In watermelon and melon, the chloroplast-derived small-fragment sequences are either a subset of large-fragment sequences or appeared multiple times in the mitochondrial genome, indicating that these fragments may have undergone multiple independent migration integrations or emerged in the mitochondrial genome after migration, replication, and reorganization. There was no evidence of migration from the mitochondria to chloroplast genome. A sequence with a total length of about 73 kb (47%) in the watermelon chloroplast genome was homologous to a sequence of about 313 kb in the nuclear genome. About 33% of sequences in the watermelon mitochondrial genome was homologous with a 260 kb sequence in the nuclear genome. A sequence with a total length of about 38 kb (25%) in the melon chloroplast genome was homologous with 461 sequences in the nuclear genome, with a total length of about 301 kb. A 3.4 Mb sequence in the nuclear genome was homologous with a melon mitochondrial sequence. These results indicate that, during the evolution of watermelon and melon, a large amount of genetic material was exchanged between the nuclear genome and the two organelle genomes in the cytoplasm.
Highlights
During plant evolution, there is genetic communication between organelle and nuclear genomes
14,945,100,009 bp were spliced to the nuclear genome, 13,894,024 bp to the mitochondrial genome, and 5,434,804 bp to the chloroplast genome by comparison with the reference genome, with an average sequencing depth of 34
10,355,752,134 bp were spliced to the nuclear genome, 91,285,780 bp to the mitochondrial genome, and 5,680,510 bp to the chloroplast genome by comparison with the reference genome, with an average sequencing depth of 30
Summary
There is genetic communication between organelle and nuclear genomes. A sequence with a total length of about 73 kb (47%) in the watermelon chloroplast genome was homologous to a sequence of about 313 kb in the nuclear genome. About 33% of sequences in the watermelon mitochondrial genome was homologous with a 260 kb sequence in the nuclear genome. A 3.4 Mb sequence in the nuclear genome was homologous with a melon mitochondrial sequence These results indicate that, during the evolution of watermelon and melon, a large amount of genetic material was exchanged between the nuclear genome and the two organelle genomes in the cytoplasm. Compared with the smaller, conserved chloroplast genome, the plant mitochondrial genome has more complex structural features, usually comprised of a single double-stranded circular DNA molecule, such as in Arabidopsis[10], watermelon, and z ucchini[11]. The evolution rate is the slowest and most conservative of the three sets of plant genomes, and the position and arrangement are quite different[16]
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