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Sudachi
Sudachi
	Sudachi fruits
Genus	Citrus
Species	C. sudachi

Sudachi (Citrus sudachi; Japanese: スダチ or 酢橘) is a small, round, green citrus fruit of Japanese origin that is a specialty of Tokushima Prefecture in Japan. Harvested before it fully ripens to yellow, it is tart and not eaten as a table fruit but used to flavor sauces and marinades, desserts, and drinks in place of lemon or lime.^[1]^[2] Genetic analysis shows it to be the product of a cross between a yuzu and another citrus fruit akin to the koji and tachibana orange.

General

The sudachi has been cultivated for centuries in parts of Japan, and is perhaps nearly as well known as the yuzu in the country.^[3] The fruit is the specialty^[4] and symbol of the prefecture of Tokushima, which produces 98% of all the fruit grown in Japan.^[5] The top producing communities are the township of Kamiyama-cho and the village of Sanagouchi-son; combined, they accounted for almost half of the prefecture's annual production in 2008.^[5]^[6] The plant has white flowers which bloom in May and June. The fruits form in bunches and are harvested in the fall. Though sudachi fruits will eventually develop a yellow-orange rind color, they are normally harvested and used while still green.^[7] They contain large smooth seeds, containing a green polyembryo.^[8]

The Sudachi is sour and not consumed whole, but normally squeezed like a lemon or lime to flavor food.^[9] A half-slice of the fruit is served as garnish^[7] with many traditional Japanese dishes which include fish, soba, udon, nabe, and even some alcoholic beverages. It has also been considered an "indispensable companion" to eating matsutake mushrooms.^[10] Ponzu (ポン酢, "pon vinegar"), a citrus-based sauce used in Japanese cuisine, often includes sudachi along with other bitter oranges (kabosu or yuzu juices, and daidai) as an ingredient. Sudachi-flavored products (such as ice cream, vodka coolers, ice pops, and soft drinks) can also be found in Japan, particularly in Tokushima Prefecture, where the fruit is sold cheaply. In other parts of Japan, the fruit is considered a delicacy and is often expensive. Sudachi are considered to have a zestier flavor and aroma compared to lemons or limes, and have a higher calcium and ascorbic acid (vitamin C) content than lemons. Compared to the related kabosu, sudachi are much smaller at 20–25 g (0.71–0.88 oz)^[7] up to 40 g (1.4 oz) compared to 100–140 g (3.5–4.9 oz).

Some California farms now grow sudachi on a commercial scale, after trees became readily available to nurseries around 2008.^[11] The fruit is also being cultivated in Piura, Peru.^{[citation needed]}

Classification

Its species name was published by Mitsutaro Shirai (1933),^[12]^[13] but most modern scientists, even while still using this nomenclature by habit or as legacy, do not consider it as a bona fide species, but a cultivar or a hybrid of uncertain parentage.^[9]^[14] Tyozaburo Tanaka's assumption that the sudachi is a hybrid of yuzu^[15] appears to be supported by DNA studies;^[14] recent genetic analysis has confirmed its status as a hybrid, with one parent being the yuzu, and the other an unidentified relative of two native-Japanese cultivars, the koji and tachibana orange.^[14]

The sudachi was classed within the Papeda subgenus in the Swingle scheme, and in the more complicated Tyozaburo Tanaka scheme within the Eusmocitrus or true yuzu subgenus, under the Osmocitrus or yuzu section.^[16]

Phytochemistry

The flavonoid eriocitrin abundant in lemon and lime juices is present in comparable concentrations in sudachi juice, but is lacking in yuzu or kabosu juices. Also, neoeriocitrin (characteristic in bergamot daidai) is found in sudachi juice and rind.^[17]^[18] Eriocitrin is an antioxidant reported to combat lipid peroxidation^[19] and like neoeriocitrin is said to block the formation of lipoxygenases involved in allergies and atherosclerosis.^[20]^[21]

Also, the flavonoid narirutin is said to be the active chemical in the Wakayama Prefecture specialty citrus jabara juice that is said to diminish the effects of pollen allergies. The jabara advertises that it contains 6 times the narirutin in yuzu, but sudachi juice also contains about 3 times as much as yuzu juice (20.1 mg per 100 ml, vs. 6.6 mg).^[17] This substance is quite abundant in the rind of yuzu and kabosu.^[17]

The ability of the sudachi to promote the body's calcium absorption has been studied as well.^[22]

In 2006, a Tokushima University research team published a report which suggests that the fruit may be effective in lowering glucose levels in diabetic patients. The team gave rats sudachi zest over a one-year period and found that their glucose levels were lowered, with signs of improved health in the rats.^[23]^[24]

References

Footnotes

^ Wilson, Julia. "What is Sudachi?". Botany World. Retrieved 13 October 2024.
^ Dee, Jake. "What Is Sudachi?". Umami Insider. Retrieved 13 October 2024.
^ Tanaka & Taninaka (1960), p. 10
^ Schmadel (2012), Dictionary of Minor Planet Names, p. 815
^ ^a ^b MLIT (2015). "Bunka-no-Mori Tunnel: anticipated effects of the opening of the tunnel (2)" 文化の森トンネル:今回の開通により期待される効果② (PDF)., citing 2011 Ministry of Agriculture figures for Tokushima's 98% share and 2008 data from Tokushima no Engei for shares within the Prefecture.
^ Miller, Kevin. "Sudachi Tree". Sudachi. Archived from the original on 2007-05-21.
^ ^a ^b ^c Wardowski, Wilfred F.; Nagy, Steven; Grierson, William (1986). Fresh citrus fruits - 150. AVI Pub. Co. p. 150. ISBN 9780870555190. Sudachi bears small fruit (20-25 g) and is traditionally grown in Tokushima Prefecture. The fruit are harvested only at the green stage and are served in cut halves as a garnish.
^ Tanaka & Taninaka (1960), p. 12
^ ^a ^b Iuchi, Akira; Hayashi, Katsuo; Tamura, Katsuhiro; Kono, Toshitaka (1996). "Technique of quality control for Sudachi (Citrus sudachi Hort. ex Shirai) juice by high pressure treatment". In Balny, Claude; Hayashi (eds.). High Pressure Bioscience and Biotechnology. Mitsuo Miyashita, Swapan K. Chakraborty. Elsevier. p. 387. ISBN 9780080544618. Sudachi (Citrus sudachi Hort. ex Shirai) is a cultivated variety of sour orange which is grown in Tokushima Prefecture, Japan. The juice of this fruit is widely used as an acidulant instead of brewed vinegar...
^ Okuyama, Masuaki (奧山益朗) (2001). Mikaku hyōgen jiten 味覚表現辞典 [Dictionary of sense of taste expressions]. Tokyodo Shuppan. p. 224. ISBN 9784490105780. 戦前から松茸には欠かせないものとして、徳島から近い都市へ来ていたが [Since before World War II, the sudachi has been considered indispensable to [the eating of] matsutake mushrooms, and had been shipped to cities near Tokushima]
^ Karp, David (September 7, 2013). "Farmers Market: Sudachi, a citrus that spices up late summer and fall". Los Angeles Times.
^ A discourse on Japanese names of trees (Jumoku Wamei Ko) 114, index 8. 1933
^ "Citrus sudachi hort. ex Shirai". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture.
^ ^a ^b ^c Shimizu, Tokurou; Kitajima, Akira; Nonaka, Keisuke; Yoshioka, Terutaka (2016), "Hybrid Origins of Citrus Varieties Inferred from DNA Marker Analysis of Nuclear and Organelle Genomes", PLOS ONE, 11 (11): e0166969, Bibcode:2016PLoSO..1166969S, doi:10.1371/journal.pone.0166969, PMC 5130255, PMID 27902727
^ Tanaka, Tyōzaburō (1932). "Early existence of the Satsuma orange in Japan". Memoirs of the Faculty of Science and Agriculture. 4. Taihoku Imperial University: 12.
^ Tanaka & Taninaka (1960), pp. 9–10
^ ^a ^b ^c Miyake, Yoshiaki (2006). "Characteristics of Flavonoids in Niihime Fruit - a New Sour Citrus Fruit" (pdf). Food Science and Technology Research. 12 (3): 186–193. doi:10.3136/fstr.12.186.
^ Kawaii, S.; et al. (1999b). "Quantitation of flavonoid constituents in citrus fruits". Journal of Agricultural and Food Chemistry. 47 (9): 3565–3571. doi:10.1021/jf990153. PMID 10552686. also reports eriocitrin in sudachi.
^ Miyake (2006), p. 186
^ エリオジクチオール及びその配糖体のアラキドン酸代謝系リポキシゲナーゼ阻害効果 [Eriodictyol and its glucosides: their ability to block arachidonic acid metabolized lipoxygenase]. National Agricultural Research Center for Western Region 近畿中国四国農業研究センター. 2005.
^ Nogata, Yoh-ichi (野方洋一 ) (2002-09-30). "Kinōsei seibun wo kōnōdo ni ganyū suru ponka kajū no seizōhō (2)" 機能性成分を高濃度に含有するポンカン果汁の製造法 (特集果実・果汁の機能性成分とその利用(2)) [Method to manusfacture ponkan juice with high concentrations of active ingredients (2)]. The Food Industry. 45 (18): 27–34. ISSN 0559-8990. NAID 40005445401., etc.
^ Nii, Yoshitaka (2004). "Japanese citrus fruit (sudachi) juice is associated with increased bioavailability of calcium from whole small fish and suppressed bone resorption in rats" スダチ果汁添加による小魚カルシウムの吸収促進および骨吸収抑制効果. Journal of Nutritional Science and Vitaminology. 50 (3). Fukuta, K.; Sakai, K.; Yamamoto, S.: 177–183. doi:10.3177/jnsv.50.177. ISSN 0301-4800. PMID 15386930.
^ Tanaka, Nakagawa; et al. (2006). "Beneficial Effects of Long-term Administration of Citrus sudachi on blood glucose level and survival, and its constituents". Yakugaku Zasshi. 126 (Suppl. 3): 46–47.
^ "Sudachi no shibori kasu ni kettōchi yokusei kōka, Tokushimadai kyōju ra happyō" スダチの搾りかすに血糖値抑制効果、徳島大教授ら発表 : ニュース : 医療と介護 [Squeezed pulp of sudachi has blood-sugar regulating effects, announces Tokushima University professors et al.]. 読売新聞（YOMIURI ONLINE） (in Japanese). 2006-08-30. Archived from the original on 2006-09-02.

Bibliography

Schmadel, Lutz D. (2012). "(12435) Sudachi". Dictionary of Minor Planet Names (6th ed.). Springer. p. 815. ISBN 9783642297182.
Sudachi at Citrus Variety Collection
Tanaka, Naonobu (田中直伸); Nakagawa, Hiroyuki (中川博之) (October 2006). "Sudachi (Citrus sudachi) no ganyū seibun narabi ni kettōchi jōshō yokusei sayō ni tsuite)" スダチ (Citrus sudachi)の含有成分並びに血糖値上昇抑制作用について [Beneficial Effects of Long-term Administration of Citrus sudachi on blood glucose level and survival, and its constituents]. Yakugaku Zasshi. 126 (Suppl. 3). Hashida, Kazuyoshi; Sato, Masatoshi; Okuse, Yui; Taoka, Chiaki; Tomofumi, Iwanaga; Kōichiro, Tsuchiya; Takaishi, Yoshihisa: 46–47.
Tanaka, Tyozaburo; Taninaka, Tokio (1960-03-31). "A Revision of Osmocitrus, a section of the genus Citrus : Revisio Aurantiacearum XIII" (PDF). Bulletin of the University of Osaka Prefecture. Ser. B, Agriculture and Biology. 10 (64): 9–13. hdl:10466/2880.