The Yukou is a Japanese citrus found in the Nagasaki Prefecture and Saga Prefecture of Japan. Genetic analysis has shown it to be a cross between the kishumikan and koji, a part-tachibana orange hybrid native to Japan.
- ^ Molecular characterization and genetic diversity among Japanese acid citrus (Citrus spp.) based on RAPD markers, Journal of Horticultural Science & Biotechnology (2003) 78(1) 108-112.
- ^ "Yuko". Ark of Taste. Slow Food Foundation for Biodiversity. Retrieved 15 February 2015.
- ^ Shimizu, Tokurou; Kitajima, Akira; Nonaka, Keisuke; Yoshioka, Terutaka; Ohta, Satoshi; Goto, Shingo; Toyoda, Atsushi; Fujiyama, Asao; Mochizuki, Takako; Nagasaki, Hideki; Kaminuma, Eli; Nakamura, Yasukazu. "Hybrid Origins of Citrus Varieties Inferred from DNA Marker Analysis of Nuclear and Organelle Genomes". PLoS One. 11: e0166969. doi:10.1371/journal.pone.0166969.