Fig 9.

Proposed scenario for BSGFV, BSOLV, and BSImV integrations into the M. balbisiana nuclear genome. The life cycle of the virus produces concatenated viral genomes in the nucleus of the cell. This concatenated genome is integrated into the nuclear genome of PKW by illegitimate recombination. The three BSV species integrate sequentially into the PKW genome. After each BSV integration, the homozygous state is obtained by self-pollination and selected. Between each new integration and self-pollination, the previously integrated BSV evolves continuously by unequal recombination and point mutation insertions, leading to the present-day structure. The BSV genome is represented in linear view, with dark blue, light blue, and red boxes indicating the three ORFs of the virus. The IG is in black.