''Coix'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an are ...

n and Australian plants in the grass family. The best-known species is ''

Coix lacryma-jobi Job's tears (''Coix lacryma-jobi)'', also known as Adlay or Adlay millet, is a tall grain-bearing perennial tropical plant of the family Poaceae (grass family). It is native to Southeast Asia and introduced to Northern China and India in remote ...

,'' widely called

Job's tears Job's tears (''Coix lacryma-jobi)'', also known as Adlay or Adlay millet, is a tall grain-bearing perennial tropical plant of the family Poaceae (grass family). It is native to Southeast Asia and introduced to Northern China and India in remote ...

. Its variety ''Coix lacryma-jobi'' var. ''ma-yuen'' is cultivated in many warm regions as a source of food, medicine, and ornamentation. The generic name is from Ancient Greek κόϊξ (''koix''), which originally referred to the doum palm (''

Hyphaene thebaica ''Hyphaene thebaica'', with common names doum palm (Ar: دوم) and gingerbread tree (also mistakenly doom palm), is a type of palm tree with edible oval fruit. It is a native to the Arabian Peninsula and also to the northern half and western pa ...

''); the fruits of the doum palm resemble the

diaspore Diaspore , also known as diasporite, empholite, kayserite, or tanatarite, is an aluminium oxide hydroxide mineral, α-AlO(OH), crystallizing in the orthorhombic system and isomorphous with goethite. It occurs sometimes as flattened crystals, bu ...

s of ''Coix''.

Species

*'' Coix aquatica'' Roxb. - China (

Yunnan Yunnan , () is a landlocked province in the southwest of the People's Republic of China. The province spans approximately and has a population of 48.3 million (as of 2018). The capital of the province is Kunming. The province borders the C ...

Guangdong Guangdong (, ), alternatively romanized as Canton or Kwangtung, is a coastal province in South China on the north shore of the South China Sea. The capital of the province is Guangzhou. With a population of 126.01 million (as of 2020) ...

, Guangxi),

Indian Subcontinent The Indian subcontinent is a list of the physiographic regions of the world, physiographical region in United Nations geoscheme for Asia#Southern Asia, Southern Asia. It is situated on the Indian Plate, projecting southwards into the Indian O ...

Indochina Mainland Southeast Asia, also known as the Indochinese Peninsula or Indochina, is the continental portion of Southeast Asia. It lies east of the Indian subcontinent and south of Mainland China and is bordered by the Indian Ocean to the west an ...

Peninsular Malaysia Peninsular Malaysia ( ms, Semenanjung Malaysia; Jawi: سمننجڠ مليسيا), or the States of Malaya ( ms, Negeri-negeri Tanah Melayu; Jawi: نڬري-نڬري تانه ملايو), also known as West Malaysia or the Malaysian Peninsula, ...

; naturalized in

New Guinea New Guinea (; Hiri Motu: ''Niu Gini''; id, Papua, or , historically ) is the world's second-largest island with an area of . Located in Oceania in the southwestern Pacific Ocean, the island is separated from Australia by the wide Torr ...

*'' Coix gasteenii'' B.K.Simon - northern

Queensland ) , nickname = Sunshine State , image_map = Queensland in Australia.svg , map_caption = Location of Queensland in Australia , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , establishe ...

*''

'' L. - China ,

Southeast Asia Southeast Asia, also spelled South East Asia and South-East Asia, and also known as Southeastern Asia, South-eastern Asia or SEA, is the geographical south-eastern region of Asia, consisting of the regions that are situated south of mainlan ...

; naturalized in other parts of Asia as well as in southern

Europe Europe is a large peninsula conventionally considered a continent in its own right because of its great physical size and the weight of its history and traditions. Europe is also considered a subcontinent of Eurasia and it is located entirel ...

Africa Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...

, the

Americas The Americas, which are sometimes collectively called America, are a landmass comprising the totality of North and South America. The Americas make up most of the land in Earth's Western Hemisphere and comprise the New World. Along with th ...

, and various oceanic islands

Formerly Included

see '' Chionachne Polytoca

Tripsacum ''Tripsacum'' is a genus of plants in the grass family native to the Western Hemisphere. Gamagrass is a common name for plants in this genus. Species formerly included see '' Anthephora Apluda Chionachne Coelorachis Elionurus Hackeloch ...

Formerly included in

This genus was formerly placed in the Maydeae, now known to be polyphyletic.p.331, "Maize and ''Tripsacum'' were previously grouped with a number of other grasses that have monoecious flowering patterns the most widely known being Job’s tears (''Coix lacryma-jobi'') into the Maydeae (74); however, molecular data revealed that this grouping was polyphyletic (61)."

Proteins and expression

Members of this genus produce their own variety of α-zein

prolamin Prolamins are a group of plant storage proteins having a high proline amino acid content. They are found in plants, mainly in the seeds of cereal grains such as wheat (gliadin), barley (hordein), rye ( secalin), corn (zein), sorghum ( kafirin) ...

s. These prolamins have undergone unusually rapid evolutionary divergence from closely related grasses, by way of copy-number changes.p.335, "Clusters of locally duplicated genes can also expand and contract rapidly, as shown by investigation of the 22-kDa α zein gene families in maize, sorghum, and coix, which appear to have experienced independent copy-number amplifications since the divergence of these three species (107)."

References

External links

The World Online Grass Flora Grassbase: ''Coix''
Poaceae genera Taxa named by Carl Linnaeus {{medicinal-plant-stub