Fig. 6. Breeding process of Mibuna inferred from literature.

Diagram of the divergence of Mibuna from Mizuna, as inferred from the literature survey. The ancestors of Mizuna and Mibuna had serrated leaves similar to those of current Mizuna. Hybridization with turnip before 1787 resulted in the emergence of Mibuna with intermediate leaves. Later, in 1873, Mibuna with round leaves appeared