Mikan
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Citrus unshiu is a semi-seedless and easy-peeling citrus species, also known as the satsuma mandarin or Japanese mandarin. During the Edo period of Japan, kishu mikans were more popular because there was a popular superstition that eating Citrus unshiu without seeds made people prone to infertility. Citrus unshiu became popular in Japan after modernization started in the Meiji period. It was introduced to the West from the Satsuma region of Japan in 1878.
Citrus unshiu was named after Unshu (Wenzhou), a famous production area of Citrus species in China, in the late Edo period of Japan. Before the name unshu mikan was established in Japan, it was called nakajima mikain or nagashima mikan after the place name of Nishi-Nakajima in Amakusa District of the Higo Province (later Nagashima, Kagoshima), where the species is said to have been born.
There are two theories about the origin of the Citrus unshiu. One is that Citrus unshiu originated in Japan, while the other is that it originated in China. According to the Japanese origin theory, several species that would serve as the parents of Citrus unshiu were introduced from China, and in the 1600s, they were born in Nishi-Nakajima, Higo Province (later Nagashima, Kagoshima) in Japan. The Japanese Ministry of Agriculture, Forestry and Fisheries, Ehime Prefecture and Japanese scientists support this theory of Japanese origin.
Genetic studies conducted in the 2010s suggest that the maternal species of Citrus unshiu is kishu (Citrus kinokuni) and the paternal species is kunenbo (Citrus nobilis Lour. var. kunip).
Various cultivars have been developed based on the Citrus unshiu, and in Japan, three cultivars, namely miyagawa wase, okitsu wase, and aoshima unshu, account for nearly half of the production volume of Citrus unshiu.
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