Biology:Aomori cassis

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Short description: Blackcurrant specific to Aomori area

Aomori Cassis
GenusRibes
SpeciesBlackcurrant (Ribes nigrum)

Aomori Cassis (Japanese: あおもりカシス) is a variety/registered regional product of blackcurrant (Ribes nigrum) produced in Aomori Prefecture, Japan. It is known for its pronounced aroma, refreshing sourness and high anthocyanin content. Since December 22, 2015 Aomori cassis has been registered under Japan's Geographical Indication (GI) protection scheme. It was the country's first officially protected regional food product.

Characteristics

Aomori cassis is described as having a strong, distinctive fragrance and a bright, tart flavor balanced by a hint of sweetness. The berries are rich in anthocyanins and other polyphenols, compounds associated with antioxidant properties. Ripe berries are typically harvested by hand to preserve quality.[1]

History

"Cassis" was from French, in which it is their word for blackcurrant, which is used to make Crème de cassis. In Japanese, cassis is pronounced kashisu.[2]

Blackcurrant cultivation in Japan began in the 20th century and expanded in cool regions. Aomori emerged as the nation's leading production area for currants, with producers organizing regionally (notably the Aomori Cassis no Kai) to develop cultivation, processing and marketing. The product's GI registration in 2015 recognized the long-standing local production methods and quality standards specific to the Aomori production area.[3][2]

This variety was introduced from Germany in 1965, but the variety name is not specified under the Seed and Seedlings Act (ja).[1] However, the Ministry of Agriculture, Forestry and Fisheries public notice of the registration under the Geographical Indication Protection System lists it as the variety "Aomori Cassis."[1] Compared to overseas varieties, it is characterized by its smaller size and thicker skin, and its sour taste with a sweet and bitter flavor. It is considered closer to nature than overseas varieties, which are subject to ongoing breeding.[1]

From February to July 1965, Professor Takeo Mochizuki of the Faculty of Agriculture at Hirosaki University was on a study trip when a German researcher offered to provide him with seedlings, but he gave up on bringing them back.[1] In the fall of 1965, Mochizuki learned that Yoshiichiro Yonaiyama (ja), a member of parliament from Tohoku Town in Aomori Prefecture, was planning to visit Germany, and asked him to bring back some seedlings.[1] Yonaiyama obtained about 50 seedlings.[1] Mochizuki began cultivating the seedlings at his home.[1] It is said that some of the seedlings were also given to Hirosaki University's Fujisaki Farm and Shichinohe Town.[4][5]

In 1975, he introduced the black currants he was growing at home to the head of the Aomori City Agriculture and Forestry Department,[1] and divided the trees and donated them to the Aomori City Agricultural Guidance Center.[1] In 1977, he provided seedlings propagated at the Aomori City Agricultural Guidance Center to the women's division of the city's agricultural cooperative and encouraged them to cultivate them, but they were not well-accustomed to being eaten raw due to their strong sour taste, and they did not become popular beyond home cultivation.[1]

In 1985, the Aomori City Agricultural Cooperative Women's Division Agricultural Processing Promotion Association (the predecessor to the current Aomori Cassis Association) was established with the aim of making it a specialty product.[1] As a result of their steady efforts, Aomori Prefecture began to attract attention from all over the country as the number one producer of cassis in Japan.[4]

Since the establishment of the Geographical Indication Protection System and the Production Process Management Business Regulations in 2015, the original seedlings called Aomori Cassis have been distributed to members on the condition that they join the group, and are not distributed to non-members.[6]

Production and cultivation

Aomori Cassis is grown mainly in the eastern Aomori/Higashi-A region (including Aomori City and nearby municipalities) where the cool climate is favorable for blackcurrant cultivation. Producers follow recommended practices to minimize pesticide use and ensure fruit quality; harvest occurs in mid-summer (generally July–early August). Domestic production in Aomori accounts for a large proportion of Japan's blackcurrant output.[3][7]

The name "Aomori Cassis" is available to the production area for Aomori City and four towns in the Higashi-Aomori region of Aomori Prefecture: Hiranai, Imabetsu, Yomogita, and Sotogahama.[8] The final product must meet the criteria for variety, cultivation method, shipping specifications, and final product.[9] Places outside this core area must use different naming schemes, such as "Blackcurrant Aomori Prefecture (Blackcurrant produced in Aomori Prefecture)" (Article 18, Paragraph 1 of the Food Labeling Standards).[10]

Genetic decoding

Aomori cassis was introduced from Germany in 1965, but the exact variety is unknown. There is also no scientific method for distinguishing between cassis varieties. A study was conducted at Hirosaki University with the aim of clarifying its origins and protecting the variety. The comparison was made between cassis from Hirosaki University 's Fujisaki Farm and Aomori cassis grown in Namioka, Aomori City. The results concluded that the cassis from Hirosaki University's Fujisaki Farm and the native Aomori cassis are the same variety.[11][12]

Uses

Aomori cassis is used fresh, frozen, and processed into jams, juices, liqueurs, confections, sauces and health/functional products. Its strong aroma and tartness make it popular in culinary uses where a vivid berry flavor is desired (for example in desserts, beverages and jams). Local producers and the Aomori tourism sector also promote cassis-based products as regional specialties.[3][2]

Geographical indication

The name "Aomori Cassis" is protected under Japan's Geographical Indication (GI) scheme; the first product registered under the national GI Act.[1][9][3] The GI registration defines the production area, permitted varieties, cultivation and harvesting methods, and quality standards that must be met for fruit to be marketed under the Aomori Cassis name.[1][13]

Nutrition and health

Blackcurrants are noted for their high anthocyanin content and vitamin C. Aomori cassis has been the subject of regional phytochemical and nutritional studies; local producers also highlight potential health benefits connected to its antioxidant components.[14]

See also

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 "Product Summary (Registration No.1)". Ministry of Agriculture, Forestry and Fisheries. https://www.maff.go.jp/e/policies/intel/gi_act/register/s1.html. Retrieved December 8, 2025. 
  2. ↑ 2.0 2.1 2.2 Leow, Florentyna (September 5, 2020). "Welcome to Aomori, the cassis capital of Japan". The Japan Times. https://www.japantimes.co.jp/life/2020/09/05/food/aomori-cassis-kashisu-harvest/. Retrieved December 8, 2025. 
  3. ↑ 3.0 3.1 3.2 3.3 "あおもりカシス とは？" (in ja). Aomori Cassis Association. https://www.aomoricassis.com/aomori-cassis-%EF%BC%8D%E3%81%82%E3%81%8A%E3%82%82%E3%82%8A%E3%82%AB%E3%82%B7%E3%82%B9%EF%BC%8D-%E3%81%A8%E3%81%AF%EF%BC%9F/. Retrieved December 8, 2025. 
  4. ↑ 4.0 4.1 "生産行程管理業務規程日本最大のカシス産地青森市(7/29)" (in ja). Matsuhirosaki. https://matsuhirosaki.blogspot.com/2015/07/729.html. 
  5. ↑ "七戸町にもカシスが！！" (in ja). Marugotoaomori. June 13, 2008. https://www.marugotoaomori.jp/blog/2008/06/3325.html. 
  6. ↑ "生産行程管理業務規程" (in ja). Ministry of Agriculture, Forestry and Fisheries. https://www.maff.go.jp/j/shokusan/gi_act/register/attach/pdf/1-12.pdf. 
  7. ↑ "Aomori Cassis" (in ja). Food Artisan (Aomori). https://www.foodartisan.jp/products/cassis/. Retrieved December 8, 2025. 
  8. ↑ "あおもりカシス" (in ja). Ministry of Agriculture, Forestry and Fisheries. https://gi-act.maff.go.jp/register/entry/1.html. 
  9. ↑ 9.0 9.1 "登録の公示(登録番号第1号)" (in ja). Ministry of Agriculture, Forestry and Fisheries. https://www.maff.go.jp/j/shokusan/gi_act/register/1.html. 
  10. ↑ "生鮮食品（農産物） - 「食品衛生相談窓口」" (in ja). Tokyo Metropolitan Government Bureau of Social Welfare and Public Health. https://www.hokeniryo1.metro.tokyo.lg.jp/shokuhin/hyouji/shokuhyouhou_seisen_nousanbutsu.html. 
  11. ↑ Nakayama, Nobuaki (2018). "あおもりカシスのゲノム解読" (in ja). Hirosaki University. https://hirosaki.repo.nii.ac.jp/record/5913/files/%E3%81%82%E3%81%8A%E3%82%82%E3%82%8A%E3%82%AB%E3%82%B7%E3%82%B9%E3%81%AE%E3%82%B2%E3%83%8E%E3%83%A0%E8%A7%A3%E8%AA%AD_%E4%B8%AD%E5%B1%B1_NN.pdf. 
  12. ↑ Nanashima, Naoki (March 24, 2020). "あおもりカシスのゲノム解読" (in ja). Hirosaki University. https://hirosaki.repo.nii.ac.jp/record/5913/files/%E3%81%82%E3%81%8A%E3%82%82%E3%82%8A%E3%82%AB%E3%82%B7%E3%82%B9%E3%81%AE%E3%82%B2%E3%83%8E%E3%83%A0%E8%A7%A3%E8%AA%AD_%E4%B8%AD%E5%B1%B1_NN.pdf. 
  13. ↑ "第1号：あおもりカシス" (in ja). 農林水産省. https://www.maff.go.jp/j/shokusan/gi_act/register/0001/index.html. Retrieved December 8, 2025. 
  14. ↑ "Phytochemical analysis of the leaf of the blackcurrant (Aomori Cassis)". Hirosaki University (repository). https://hirosakiuhw.repo.nii.ac.jp/record/102/files/HirosakiIryoFukushi_8%281%29_15.pdf. Retrieved December 8, 2025. 



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