Biology:Japanese citrus

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Short description: Citrus fruit and plant
Tachibana
Iyokan
Dekopon (Hallabong, Sumo Citrus)

The Kojiki and Nihon Shoki, compiled in the 700s, were the first books in Japan to describe citrus fruits. The Nihon Shoki states that a man named Tajimamori brought back citrus fruits from the Tokoyo no kuni (常世の国, Land of immortality) on the orders of Emperor Suinin, which is thought to refer to the tachibana orange that grows wild in Japan. The Man'yōshū, a collection of poems from the same period, contains many poems about tachibana orange, and because of its strong acidity at the time, it was dried and used for medicinal and ornamental purposes rather than for food. The Kokin Wakashū, compiled in the 900s, mentions that tachibana orange was burned and used as incense to give a nice fragrance to kimonos. In Japan, tachibana orange is a symbol of eternity and is the motif for the Order of Culture.[1][2]

History

Citrus fruits are believed to have originated in the Assam of India and the foothills of the Himalayas, and later spread throughout the world. Yuzu, kunembo, daidai, and kishu mikan are believed to have been introduced to Japan from China, where Kishu mikan were the mainstay until the unshu mikan became dominant.[3]

Japan's warm summer climate makes it particularly suitable for citrus plants; while they are grown all over the country, the largest citrus growing areas are located in the prefectures of Wakayama, Shizuoka, Tokushima, Kochi, Oita, Miyazaki and Ehime.[4]

The most widely grown variety in Japan today is the unshu mikan (Citrus unshiu), also known as the satsuma orange. There are two theories about the origin of the unshu mikan. One is that unshu mikan 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 unshu mikan were introduced from China, and in the 1600s, they were crossed in Nishi-Nakajima, Higo Province (later Nagashima, Kagoshima) in Japan. The Japanese Ministry of Agriculture, Forestry and Fisheries, Ehime Prefecture and several Japanese scientists support this theory of Japanese origin.[5][6][7][8][9] Genetic research has shown that the unshu mikan is a cross between the kishu and kunembo.[10][11] During the Edo period (1603–1867), unshu mikan were not very popular due to a superstition that eating seedless unshu mikan would make one infertile. It was not until the Meiji era (1868–1912), when modernization began, that the popularity of unshu mikan increased.[9]

From the Edo period (1603–1867) to the present, the Japanese have created numerous varieties of citrus fruits, collectively known as tyūbankan (中晩柑). It is a general term for citrus fruits shipped from January to May, after the shipping period of unshu mikan, which is from October to February.[3][12][13] For example, natsumikan (Citrus natsudaidai) was developed around 1700,[14] hassaku in 1860,[15] and iyokan in 1886.[16] Kiyomi, Setoka and Kanpei are also types of tyūbankan.[12][13] dekopon, created in 1972, is one of the most popular varieties internationally. Dekopon was introduced to South Korea in the 1990s and became popular as Hallabong, was exported to California in 1998, and has been marketed as "Sumo Citrus" since 2011.[17]

In Japan, various cultivars have been developed based on the unshu mikan, and three cultivars, namely miyagawa wase, okitsu wase, and aoshima unshu, account for nearly half of the production volume of unshu mikan.[18]

Japanese taxonomy

Main page: Biology:Citrus taxonomy

Japan usually follows the botanical names of the taxonomy from Tyôzaburô Tanaka, often referred to as the "Tanaka system", giving for each cultivar a separate name no matter if it is pure or a hybrid of two or more species or varieties. While elsewhere it is more popular to classify the genus citrus into species, and further into varieties, and then into cultivars or hybrid. Such a system was created by Walter Tennyson Swingle from Florida and is called the "Swingle system".[19] The different approaches of the two systems lead to partially-overlapping or nested 'species', for example, Citrus unshiu and Citrus tangerina (Tanaka) versus Citrus reticulata (Swingle). Likewise, common terms, like "mikan", do not always align with these taxonomic groups.

Japanese citrus (partial list)

Japanese citrus fruits include the following:

Common
name(s) 		Image Taxonomic
name/constituents 		Notes
Amanatsu Citrus kawanonatsudaidai fruit.jpg Citrus × natsudaidai Yellowish-orange in colour, about the size of grapefruit and oblate in shape. The fruit contains 12 segments and about 30 seeds.
Banpeiyu (pomelo cultivar) Pomelo fruit.jpg Citrus maxima
Bushukan (Buddha's hand) Buddhas hand 1.jpg Citrus medica var. sarcodactylis
Daidai Daidai.jpg Citrus × daidai
Dekopon Dekopon.jpg Citrus unshiu × sinensis × C. poonensis
Haruka はるか.JPG Citrus tamurana × natsudaidai
Hassaku orange Hassaku fruit and cross section.jpg Citrus × hassaku
Hyuganatsu Hyuganatsu-leaf-table-march2015.jpg Citrus tamurana
Iyokan Iyokan on tree.jpg Citrus × iyo
Jabara Citrus jabara by OpenCage.jpg Citrus × jabara
Kabosu Kabosu.jpg Citrus sphaerocarpa
Karatachi (Japanese bitter orange) 20151019Citrus trifoliata5.jpg Citrus trifoliata
Kanpei 귤과 레드향.jpg 'Dekopon' × 'nishinokaori'
Kawachi Bankan (Mishokan) Kawachi bankan 2 河内晩柑.jpg Citrus kawachiensis
Kinkan (Kumquat) Kumquat from Spain.jpg Citrus japonica
Kinkoji unshiu Citrus obovoidea × unshiu
Kishu CherryOrange.compare (cropped).png Citrus kinokuni
Kiyomi Kiyomi.JPG Citrus unshiu × sinensis
Kobayashi mikan Citrus natsudaidai × unshiu
Koji orange Madarines white bg02.jpg Citrus leiocarpa
Mikan Citrus unshiu 20101127 c.jpg Citrus unshiu
Ōgonkan Ōgonkan.jpg Citrus flaviculpus
Ponkan (Tangerine) TangerineFruit.jpg Citrus poonensis
Reikou
Sakurajima komikan (mandarin orange cultivar), Sakurajima Mikan.JPG Citrus × sinensis
Sanbokan Citrus sulcata.jpg Citrus sulcata
Shonan gold 湘南ゴールド 結果状況３.JPG Citrus flaviculpus × Citrus unshiu
Shikuwasa (Shiikwaasaa, Shequasar, Hirami lemon) Shikwasa-1.jpg Citrus × depressa
Sudachi Sudachi.png Citrus sudachi
Tachibana Citrus tachibana, Kofuku-ji Nanendo.JPG Citrus tachibana or Citrus reticulata var. tachibana
Tankan Citrus poonensis × Citrus sinensis
Tsunonozomi 'Kiyomi' × 'Encore'
Yukou Citron Japonais.jpg Citrus yuko
Yuzu Yuzu oranges (6459456959).jpg Citrus junos

[20]

References

  1. ↑ "Error: no |title= specified when using {{Cite web}}" (in ja). Japan Agricultural Cooperatives, Nishiuwa. 6 June 2019. https://nishiuwamikan.com/news/2019/06/no068/. 
  2. ↑ "Error: no |title= specified when using {{Cite web}}" (in ja). Japan Agricultural Cooperatives, Nishiuwa. 16 June 2019. https://nishiuwamikan.com/news/2019/06/no069/. 
  3. ↑ 3.0 3.1 "Error: no |title= specified when using {{Cite web}}" (in ja). Shizuoka prefecture. 26 January 2023. https://www.pref.shizuoka.jp/kurashikankyo/shokuseikatsu/kaju/1003353/1003354/1027536.html. 
  4. ↑ Itoh, Makiko (2014-01-14). "Juiced for a citrus winter" (in en). https://www.japantimes.co.jp/life/2014/01/14/food/juiced-for-a-citrus-winter/. 
  5. ↑ "Hybrid Origins of Citrus Varieties Inferred from DNA Marker Analysis of Nuclear and Organelle Genomes.". Shimizu Tokurou; Kitajima Akira; Nonaka Keisuke; Yoshioka Terutaka; Ohta Satoshi; Goto Shingo; Toyoda Atsushi; Fujiyama Asao; Mochizuki Takako; Nagasaki Hideki; Kaminuma Eli; Nakamura Yasukazu. November 30, 2016. p. 50. https://repository.kulib.kyoto-u.ac.jp/dspace/bitstream/2433/217793/1/journal.pone.0166969.pdf. "Therefore, it is likely that kunenbo was backcrossed to Kishu in the Kagoshima region of Japan several times and Satsuma and Yatsushiro were selected from their offspring." 
  6. ↑ "Error: no |title= specified when using {{Cite web}}" (in ja). The Japanese Ministry of Agriculture, Forestry and Fisheries. https://www.maff.go.jp/j/pr/aff/1701/spe1_01.html. 
  7. ↑ "Error: no |title= specified when using {{Cite web}}" (in ja). Ehime Prefecture. p. 6. https://www.maff.go.jp/j/pr/aff/1701/spe1_01.html. 
  8. ↑ Misaki, Akira (November 1999). "紀州有田みかんの起源と発達史" (in ja). 経済理論 [The Wakayama Economic Review] (University of Wakayama) 292: 97–118. http://www.mikan.gr.jp/report/kigen/page7.html. "(After the many years of research, Dr. Tanaka has concluded the place of origin of Satsuma is Nagashima, Kagoshima. Satsuma is a chance seedling of Sōkitsu, Mankitsu, or Tendaisankitsu introduced from Huangyan Zhejiang, China. It appeared in the early Edo period. The place where Satsuma was born by mutation was Nishi-nakajima, Amakusa District, Higo Province (later Nagashima, Kagoshima), and was called Nakajima Mikan or Nagashima Mikan.)". 
  9. ↑ 9.0 9.1 "日本と世界の食事情「こたつでミカン」の光景はなぜ生まれたのか" (in ja). Narumi Sato. Japan Business Press Co., Ltd.. February 1, 2019. p. 3. http://jbpress.ismedia.jp/articles/-/55347?page=3. "During the Edo period, when Kishu mikan were being cultivated, unshu mikan were already being cultivated. However, they were not yet called unshu mikan, but Nakajima mikan. Although mandarins were a luxury, unshu mikan were not the most popular. The unshu mikan is unique in that it is ready to peel and has no seeds. The lack of seeds is good because they are easy to eat, but in the Edo period, the lack of seeds was a factor that made them unpopular. It was believed that eating seedless fruit meant that one could no longer produce offspring, thus ending one's family lineage. When the fruit was named "unshu mikan" in the late Edo period, it was finally recognized. Wenzhou is a mandarin production area in China, and the name "unshu mikan" means "a mandarin comparable to the one produced in Wenzhou". The unshu mikan is often mistaken for a mandarin imported from China, but it is a genuine Japanese mandarin. It was not until the Meiji period that the cultivation of unshu mikan became popular." 
  10. ↑ "Parental diagnosis of satsuma mandarin (Citrus unshiu Marc.) revealed by nuclear and cytoplasmic markers". Hiroshi Fujii, Satoshi Ohta, Keisuke Nonaka, Yuichi Katayose, Toshimi Matsumoto, etc.. November 30, 2016. https://www.jstage.jst.go.jp/article/jsbbs/advpub/0/advpub_16060/_pdf. 
  11. ↑ "The genome sequence of Satsuma mandarin was unveiled". Tokurou Shimizu, Yasuhiro Tanizawa, Takako Mochizuki, Hideki Nagasaki, Terutaka Yoshioka, Atsushi Toyoda, Asao Fujiyama, Eli Kaminuma, Yasukazu Nakamura. February 20, 2018. https://www.naro.go.jp/english/topics/laboratory/fruit/079860.html. 
  12. ↑ 12.0 12.1 "Error: no |title= specified when using {{Cite web}}" (in ja). Japan Agricultural Cooperatives, Nishiuwa. 6 January 2022. https://nishiuwamikan.com/news/2022/01/no226/. 
  13. ↑ 13.0 13.1 "Error: no |title= specified when using {{Cite web}}" (in ja). 10-mikan.com. https://10-mikan.com/knowhow/%E4%B8%AD%E6%99%A9%E6%9F%91%E3%81%A8%E3%81%AF%EF%BC%9F/. 
  14. ↑ "Error: no |title= specified when using {{Cite web}}" (in ja). Kotobank. https://kotobank.jp/word/%E3%83%8A%E3%83%84%E3%83%9F%E3%82%AB%E3%83%B3-770198. 
  15. ↑ "Error: no |title= specified when using {{Cite web}}" (in ja). https://kotobank.jp/word/%E3%83%8F%E3%83%83%E3%82%B5%E3%82%AF-770908. 
  16. ↑ "Error: no |title= specified when using {{Cite web}}" (in ja). Kotobank. https://kotobank.jp/word/%E4%BC%8A%E4%BA%88%E6%9F%91-436253. 
  17. ↑ "Error: no |title= specified when using {{Cite web}}" (in ja). The Japanese Ministry of Agriculture, Forestry and Fisheries. https://www.maff.go.jp/j/kanbo/tizai/brand/kentoukai/attach/pdf/3siryou-6.pdf. 
  18. ↑ "Error: no |title= specified when using {{Cite web}}" (in ja). National Agriculture and Food Research Organization. https://www.naro.go.jp/laboratory/nifts/kih/area/citrus_unshiu/index.html. 
  19. ↑ Citrus Genetics... Iqrar A. Khan
  20. ↑ Green, Aliza. (2004) Quirk Books. Field Guide to Produce: How to Identify, Select, and Prepare Virtually Every Fruit and Vegetable at the Market. Page 109. ISBN:1-931686-80-7

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