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{{Short description|
{{Redirect|Azuki}}
{{Speciesbox
| name = Adzuki beans
| image = Azuki Beans.jpg
| image_caption =
| genus = Vigna
| species = angularis
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}}
''Vigna angularis'', also known as the '''adzuki bean''' {{nihongo||{{linktext|小豆}} (アズキ)||''azuki'', {{lang|en|Uncommon}} アヅキ, ''adzuki''|lead=yes}}, '''
Scientists presume ''Vigna angularis'' var. ''nipponensis'' is the [[progenitor]].<ref>{{cite journal|pmc=4629392|year=2015|last1=Yang|first1=K|title=Genome sequencing of adzuki bean (''Vigna angularis'') provides insight into high starch and low fat accumulation and domestication|journal= [[Proceedings of the National Academy of Sciences]] |volume=112|issue=43|pages=13213–13218|last2=Tian|first2=Z|last3=Chen|first3=C|last4=Luo|first4=L|last5=Zhao|first5=B|last6=Wang|first6=Z|last7=Yu|first7=L|last8=Li|first8=Y|last9=Sun|first9=Y|last10=Li|first10=W|last11=Chen|first11=Y|last12=Li|first12=Y|last13=Zhang|first13=Y|last14=Ai|first14=D|last15=Zhao|first15=J|last16=Shang|first16=C|last17=Ma|first17=Y|last18=Wu|first18=B|last19=Wang|first19=M|last20=Gao|first20=L|last21=Sun|first21=D|last22=Zhang|first22=P|last23=Guo|first23=F|last24=Wang|first24=W|last25=Li|first25=Y|last26=Wang|first26=J|last27=Varshney|first27=R. K|last28=Wang|first28=J|last29=Ling|first29=H. Q|last30=Wan|first30=P|pmid=26460024|doi=10.1073/pnas.1420949112|bibcode=2015PNAS..11213213Y|doi-access=free}}</ref>
== Origin and diversity ==
=== Speciation and domestication ===
The wild ancestor of cultivated adzuki bean is probably ''Vigna angularis'' var. ''nipponensis'',<ref name="Yamaguchi">{{cite journal |last=Yamaguchi |first=Hirofumi |date=1992 |title=Wild and Weed Azuki Beans in Japan |journal= [[Economic Botany]] |volume=46 |issue=4 |pages=384–394 |doi=10.1007/bf02866509|s2cid=22975059 }}</ref> which is distributed across
Seed remains of Adzuki beans discovered at the Central Highlands of Japan were dated to c. 6,000–4,000 BP, and represent the to date oldest evidence for its cultivation, supporting an origin in Japan. Evidence suggests that "wild azuki bean have been domesticated and cultivated in Japan for over 10,000 years".<ref>{{Cite journal |last1=Takahashi |first1=Yu |last2=Nasu |first2=Hiroo |last3=Nakayama |first3=Seiji |last4=Tomooka |first4=Norihiko |date=2023 |title=Domestication of azuki bean and soybean in Japan: From the insight of archeological and molecular evidence |url=https://www.jstage.jst.go.jp/article/jsbbs/73/2/73_22074/_html/-char/en |journal=Breeding Science |volume=73 |issue=2 |pages=117–131 |doi=10.1270/jsbbs.22074|pmid=37404345 |pmc=10316305 }}</ref>
===Breeding===
[[File:Leiden University Library - Seikei Zusetsu vol. 18, page 018 - 竹小豆 - Vigna umbellata (Thunb.) Ohwi & H.Ohashi, 1804.jpg|thumb|
In Japan, the adzuki bean was one of the first crops subjected to scientific [[plant breeding]].<ref name="Kaga">{{cite journal |last1=Kaga |first1=Akito |last2=Isemura |first2=Takehisa |last3=Tomooka |first3=Norihiko |last4=Vaughan |first4=Duncan A. |date=2008 |title=The Genetics of Domestication of the Azuki Bean (Vigna angularis) |journal= [[Genetics (journal)|Genetics]] |volume=178 |issue=2 |pages=1013–1036 |doi=10.1534/genetics.107.078451|pmid=18245368 |pmc=2248364 }}</ref> Important breeding traits are yield, pureness of the bean colour, and the maturing time.<ref name="Schuster"/> Separate cultivars with smaller seeds and higher biomass are bred for [[fodder]] production and as [[green manure]].<ref name="Schuster"/> Locally adapted cultivars are available in China, Japan, Korea, and Taiwan.<ref name="Jansen"/> More than 300 cultivars/landraces/breeding lines are registered in Japan.<ref name="Jansen"/> Moreover, China (Institute of Crop Germplasm Resources (CAAS), [[Beijing]], more than 3700 accessions) and Japan (Tokachi Agricultural Experiment Station, [[Hokkaido]], about 2500 accessions) accommodate large [[germplasm]] collections of adzuki bean.<ref name="Jansen"/>
===Weed forms===
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The name ''adzuki'' is a transliteration of the native Japanese アヅキ, as it was spelled according to [[historical kana orthography]]. The name is also transliterated as ''azuki'', reflecting the modern spelling アズキ, or less commonly as ''aduki'', according to an [[Romanization of Japanese|alternate system of romanization]]. All are meant to represent the same Modern Japanese pronunciation, ''azuki''.
Japanese also has a Chinese [[loanword]], {{nihongo||小豆|shōzu}}, which means "small bean", its counterpart {{nihongo|"large bean"|大豆|''daizu''}} being the [[soybean]]. It is common to write {{lang|ja|小豆}} in [[kanji]] but pronounce it as ''azuki'' ''{{Audio|Ja-Adzuki.oga|listen}}'', an example of ''{{lang|ja-Latn|[[jukujikun]]}}''. In China, the corresponding name ({{zh|c=小豆|p=xiǎodòu}}) still is used in botanical or agricultural parlance, however, in everyday Chinese, the more common terms are ''{{lang|zh-Latn|hongdou}}'' ({{zh|c=红豆|p=hóngdòu|labels=no}}) and ''{{lang|zh-Latn|chidou}}'' ({{zh|c=赤豆|p=chìdòu|labels=no}}), both meaning "'''red bean'''", because almost all Chinese cultivars are uniformly red. In English the beans are often described as "red beans" in the context of Chinese cuisine,
==Cultivation==
===Area and yield===
The adzuki bean is mainly cultivated in China ({{
===Ecological requirements===
Optimal temperature range for adzuki bean growth is between {{ Convert |15
===Production===
The sowing of the peas is in {{ Convert | 2–3
===Pests and diseases===
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==Botany==
[[File:Naturalis Biodiversity Center - RMNH.ART.651 - Vigna angularis - Kawahara Keiga - 1823 - 1829 - Siebold Collection - pencil drawing - water colour.jpeg|thumb|right| [[historical kana orthography|Historical kana]] アヅキ |alt=Illustration with [[historical kana orthography|historical kana]] アヅキ]]
The description of the adzuki bean can vary between authors because there are both wild<ref name="Efloras">{{Cite web|url= http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=242354363|title= ''Vigna''.: ''Vigna angularis'' (Willdenow) Ohwi & H. Ohashi |last1=Wu| first1=Delin|last2= Thulin|first2=Mats |access-date= 2016-11-09 }}</ref> and cultivated forms<ref name="Schuster"/> of the plant.
The adzuki bean is an [[annual plant|annual]],<ref name="Jansen"/><ref name="Efloras"/> rarely [[biennial plant|biennial]]<ref name="Schuster"/> bushy erect or twining herb<ref name="Jansen"/><ref name="Efloras"/> usually between {{ Convert |30 and 90
===Roots===
The adzuki bean has a [[taproot]] type of root system that can reach a depth of {{ Convert | 40–50
===Leaves===
The leaves of the adzuki bean are [[trifoliate]], [[pinnate]] and arranged alternately along the stem on a long [[petiole (botany)|petiole]].<ref name="Schuster"/><ref name="Jansen"/><ref name="Ecoport"/> Leaflets are ovate and about {{ Convert | 5–10
===Flowers===
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===Fruits===
Adzuki pods are smooth, cylindrical and thin-walled.<ref name="Ecoport"/><ref name="Lumpkin"/> The colour of the pods is green turning white to grey as they mature.<ref name="Ecoport"/><ref name="Lumpkin"/> The size is between {{ Convert | 5–13
===Seeds===
The seeds are smooth and subcylindric with a length of {{ Convert | 5.0-9.1
===Physiology===
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| water=66 g
| source_usda=1
| note=
}}
In [[East Asian cuisine]], the adzuki bean is commonly sweetened before eating. In particular, it is often boiled with sugar, producing red bean paste
Adzuki beans are commonly eaten [[sprouting|sprouted]] or boiled in a hot, [[tea]]-like drink.
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{{DEFAULTSORT:Adzuki Bean}}
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