Crop wild relative

The wild relatives of crop plants constitute an increasingly important resource for improving agricultural production and for maintaining sustainable agro-ecosystems. Their natural selection in the wild accumulates a rich set of useful traits that can be introduced into crop plants by crossing.Bioversity International, (2006). Crop wild relatives. Bioversity International, Rome.FAO, (1998). The State of the World’s Plant Genetic Resources for Food and Agriculture. FAO, RomeFAO, (2008). Establishment of a global network for the in situ conservation of crop wild relatives: status and needs. FAO, Rome With the advent of anthropogenic climate change and greater ecosystem instability CWRs are likely to prove a critical resource in ensuring food security for the new millennium.{{cite book | vauthors = Maxted N, Ford-Lloyd BV, Kell SP | date = 2008 | chapter = Crop wild relatives: establishing the context. | veditors = Maxted N, Ford-Lloyd BV, Kell SP, Iriondo J, Dulloo E, Turok J | title = Crop Wild Relative Conservation and Use | pages = 3–30 | publisher = CABI Publishing | location = Wallingford }} It was Nikolai Vavilov, the Russian botanist who first realized the importance of crop wild relatives in the early 20th century.{{cite book | vauthors = Vavilov NI | date = 1926 | title = Studies in the origin of cultivated plants | publisher = Institute of Applied Botany and Plant Breeding | location = Leningrad }} Genetic material from CWRs has been utilized by humans for thousands of years to improve the quality and yield of crops. Farmers have used traditional breeding methods for millennia, wild maize (Zea mexicana) is routinely grown alongside maize to promote natural crossing and improve yields. More recently, plant breeders have utilised CWR genes to improve a wide range of crops like rice (Oryza sativa), tomato (Solanum lycopersicum) and grain legumes.{{cite journal | vauthors = Hajjar R, Hodgkin T | year = 2007 | title = The use of wild relatives in crop improvement: a survey of developments over the last 20 years | journal = Euphytica | volume = 156 | issue = 1–2| pages = 1–13 | doi=10.1007/s10681-007-9363-0| s2cid = 36269581 }}{{Cite journal |last1=Bohra |first1=Abhishek |last2=Kilian |first2=Benjamin |last3=Sivasankar |first3=Shoba |last4=Caccamo |first4=Mario |last5=Mba |first5=Chikelu |last6=McCouch |first6=Susan R. |last7=Varshney |first7=Rajeev K. |date=2022-04-01 |title=Reap the crop wild relatives for breeding future crops |journal=Trends in Biotechnology |language=en |volume=40 |issue=4 |pages=412–431 |doi=10.1016/j.tibtech.2021.08.009 |pmid=34629170 |s2cid=238580339 |issn=0167-7799|doi-access=free }}

CWRs have contributed many useful genes to crop plants, and modern varieties of most major crops now contain genes from their wild relatives.{{Cite journal| vauthors = Dempewolf H, Baute G, Anderson J, Kilian B, Smith C, Guarino L |date=2017-05-06|title=Past and Future Use of Wild Relatives in Crop Breeding |journal=Crop Science|language=en|volume=57|issue=3|pages=1070–1082|doi=10.2135/cropsci2016.10.0885|issn=0011-183X|doi-access=free}} Therefore, CWRs are wild plants related to socio-economically important species including food, fodder and forage crops, medicinal plants, condiments, ornamental, and forestry species, as well as plants used for industrial purposes, such as oils and fibres, and to which they can contribute beneficial traits. A CWR can be defined as "... a wild plant taxon that has an indirect use derived from its relatively close genetic relationship to a crop...”{{cite journal | vauthors = Maxted N, Ford-Lloyd BV, Jury SL, Kell SP, Scholten MA | year = 2006 | title = Towards a definition of a crop wild relative | journal = Biodiversity and Conservation | volume = 15 | issue = 8| pages = 2673–2685 | doi=10.1007/s10531-005-5409-6| bibcode = 2006BiCon..15.2673M | s2cid = 26885014 }}

File:Genetic-Reserve-Syria.jpg]]

CWRs are essential components of natural and agricultural ecosystems and hence are indispensable for maintaining ecosystem health. Their conservation and sustainable use is very important for improving agricultural production, increasing food security, and maintaining a healthy environment.{{cite book | vauthors = Hawkes JG, Maxted N, Ford-Lloyd BV | date = 2000 | title = The ex situ conservation of plant genetic resources | pages = 1–250 | publisher = Kluwer | location = Dordrecht }}{{cite journal | vauthors = Heywood VH, Dulloo ME | year = 2006 | title =In Situ Conservation of Wild Plant Species – a Critical Global Review of Good Practices. IPGRI Technical Bulletin No. 11. IPGRI, Rome}}{{cite journal | vauthors = Meilleur BA, Hodgkin T | title = In situ conservation of crop wild relatives: Status and trends| journal = Biodiversity and Conservation | volume = 13 | issue = 4| pages = 663–684 | doi=10.1023/b:bioc.0000011719.03230.17| year = 2004 | bibcode = 2004BiCon..13..663M| s2cid = 3064850}}

File:Geographic hotspots of distributions of crop wild relatives not represented in genebanks.tif

The natural populations of many CWRs are increasingly at risk. They are threatened by habitat loss through the destruction and degradation of natural environment or their conversion to other uses. Deforestation is leading to the loss of many populations of important wild relatives of fruit, nut, and industrial crops. Populations of wild relatives of cereal crops that occur in arid or semi-arid lands are being severely reduced by over grazing and resulting desertification. The growing industrialization of agriculture is drastically reducing the occurrence of CWRs within the traditional agro-ecosystems. The wise conservation and use of CWRs are essential elements for increasing food security, eliminating poverty, and maintaining the environment.{{cite journal | vauthors = Tanksley SD, McCouch SR | title = Seed banks and molecular maps: unlocking genetic potential from the wild | journal = Science | volume = 277 | issue = 5329 | pages = 1063–6 | date = August 1997 | pmid = 9262467 | doi = 10.1126/science.277.5329.1063 }}

Conservation strategies for CWRs often consider both in situ and ex situ conservation.{{cite journal | vauthors = Taylor NG, Kell SP, Holubec V, Parra-Quijano M, Maxted N |title=A systematic conservation strategy for crop wild relatives in the Czech Republic |journal=Diversity and Distributions |date=2017 |volume=23 |issue=4 |pages=448–462 |doi=10.1111/ddi.12539|bibcode=2017DivDi..23..448T |url=http://eprints.whiterose.ac.uk/119229/1/Taylor_etal_2017_Czech_CWR_Conservation.pdf |doi-access=free }} These are complementary approaches to CWR conservation, since each has its own advantages and disadvantages. For example, whilst ex situ conservation protects CWR (or more correctly, their genes) from threats in the wild, it can limit evolution and adaptation to new environmental challenges.

In 2016, 29% of wild relative plant species were completely missing from the world’s genebanks, with a further 24% represented by fewer than 10 samples. Over 70% of all crop wild relative species worldwide were in urgent need of further collecting to improve their representation in genebanks, and over 95% were insufficiently represented with regard to the full range of geographic and ecological variation in their native distributions. While the most critical priorities for further collecting were found in the Mediterranean and Near East, Western and Southern Europe, Southeast and East Asia, and South America, crop wild relatives insufficiently represented in genebanks are distributed across almost all countries worldwide.{{Cite journal |last1=Castañeda-Álvarez |first1=Nora P. |last2=Khoury |first2=Colin K. |last3=Achicanoy |first3=Harold A. |last4=Bernau |first4=Vivian |last5=Dempewolf |first5=Hannes |last6=Eastwood |first6=Ruth J. |last7=Guarino |first7=Luigi |last8=Harker |first8=Ruth H. |last9=Jarvis |first9=Andy |last10=Maxted |first10=Nigel |last11=Müller |first11=Jonas V. |date=2016-03-21 |title=Global conservation priorities for crop wild relatives |url=https://www.nature.com/articles/nplants201622 |journal=Nature Plants |language=en |volume=2 |issue=4 |page=16022 |doi=10.1038/nplants.2016.22 |pmid=27249561 |s2cid=7174536 |issn=2055-0278|hdl=10568/72706 |hdl-access=free }}

• Oats (Avena sativa) – Avena byzantina
• Quinoa (Chenopodium quinoa) – Chenopodium berlandieri
• Finger Millet (Eleusine coracana) – Eleusine africana{{Cite journal|last1=Dida|first1=Mathews M.|last2=Oduori|first2=Chrispus A.|last3=Manthi|first3=Samuel J.|last4=Avosa|first4=Millicent O.|last5=Mikwa|first5=Erick O.|last6=Ojulong|first6=Henry F.|last7=Odeny|first7=Damaris A.|date=2021|title=Novel sources of resistance to blast disease in finger millet|journal=Crop Science|language=en|volume=61|issue=1|pages=250–262|doi=10.1002/csc2.20378|s2cid=225135026 |issn=1435-0653|doi-access=free}}
• Barley (Hordeum vulgare) – Hordeum arizonicum and Hordeum spontaneum{{Cite journal|last1=Rehman|first1=Sajid|last2=Amouzoune|first2=Mariam|last3=Hiddar|first3=Houda|last4=Aberkane|first4=Hafid|last5=Benkirane|first5=Rachid|last6=Filali-Maltouf|first6=Abdelkarim|last7=Al-Jaboobi|first7=Muamar|last8=Acqbouch|first8=Leila|last9=Tsivelikas|first9=Athanasios|last10=Verma|first10=Ramesh Pal Singh|last11=Kehel|first11=Zakaria|date=2021|title=Traits discovery in Hordeum vulgare sbsp. spontaneum accessions and in lines derived from interspecific crosses with wild Hordeum species for enhancing barley breeding efforts|url=https://onlinelibrary.wiley.com/doi/abs/10.1002/csc2.20360|journal=Crop Science|language=en|volume=61|issue=1|pages=219–233|doi=10.1002/csc2.20360|s2cid=225167970 |issn=1435-0653|doi-access=free}}
• Rice (Oryza sativa) – Oryza rufipogon{{Cite journal|last1=Tin|first1=Huynh Quang|last2=Loi|first2=Nguyen Huu|last3=Labarosa|first3=Sandy Jan E.|last4=McNally|first4=Kenneth L.|last5=McCouch|first5=Susan|last6=Kilian|first6=Benjamin|date=2021|title=Phenotypic response of farmer-selected CWR-derived rice lines to salt stress in the Mekong Delta|journal=Crop Science|language=en|volume=61|issue=1|pages=201–218|doi=10.1002/csc2.20354|s2cid=229546947 |issn=1435-0653|doi-access=free}}
• African Rice (Oryza glaberrima) – Oryza barthii
• Pearl Millet (Pennisetum glaucum) – Pennisetum purpureum{{Cite journal|last1=Sharma|first1=Shivali|last2=Sharma|first2=Rajan|last3=Govindaraj|first3=Mahalingam|last4=Mahala|first4=Rajendra Singh|last5=Satyavathi|first5=C. Tara|last6=Srivastava|first6=Rakesh K.|last7=Gumma|first7=Murali Krishna|last8=Kilian|first8=Benjamin|date=2021|title=Harnessing wild relatives of pearl millet for germplasm enhancement: Challenges and opportunities|journal=Crop Science|language=en|volume=61|issue=1|pages=177–200|doi=10.1002/csc2.20343|s2cid=224875047 |issn=1435-0653|doi-access=free}}
• Rye (Secale cereale subsp. cereale) – Secale cereale subsp. dighoricum
• Sorghum (Sorghum bicolor) – Sorghum arundinaceum and Sorghum halepense{{Cite journal|last1=Ochieng|first1=Grace|last2=Ngugi|first2=Kahiu|last3=Wamalwa|first3=Lydia N.|last4=Manyasa|first4=Eric|last5=Muchira|first5=Nicoleta|last6=Nyamongo|first6=Desterio|last7=Odeny|first7=Damaris A.|date=2021|title=Novel sources of drought tolerance from landraces and wild sorghum relatives|journal=Crop Science|language=en|volume=61|issue=1|pages=104–118|doi=10.1002/csc2.20300|s2cid=225470264 |issn=1435-0653|doi-access=free}}
• Broom millet (Panicum miliaceum) – Panicum fauriei
• Wheat (Triticum aestivum) – Einkorn wheat (Triticum monococcum)
• Maize (Zea mays subsp. mays) – Zea diploperennis

Note: Many different vegetables share one common ancestor, particularly in the Brassica genus of plants (cruciferous vegetables). Many vegetables are also hybrids of different species, again this is particularly true of Brassicas (see e.g. triangle of U).

• Asparagus (Asparagus officinalis) – Asparagus dauricus
• Beet (Beta vulgaris subsp. vulgaris) – Beta vulgaris subsp. maritima
• Black Mustard (Brassica nigra) – Wild mustard (Sinapis arvensis)
• Cabbage (Brassica oleracea var. capitata) - Brassica elongata
• Carrot (Daucus carota) – Daucus gracilis{{Cite journal|last1=Simon|first1=Philipp W.|last2=Rolling|first2=William R.|last3=Senalik|first3=Douglas|last4=Bolton|first4=Adam L.|last5=Rahim|first5=M. A.|last6=Mannan|first6=A. T. M. Majharul|last7=Islam|first7=Ferdouse|last8=Ali|first8=A.|last9=Nijabat|first9=A.|last10=Naveed|first10=Naima Huma|last11=Hussain|first11=Rameez|date=2021|title=Wild carrot diversity for new sources of abiotic stress tolerance to strengthen vegetable breeding in Bangladesh and Pakistan|journal=Crop Science|language=en|volume=61|issue=1|pages=163–176|doi=10.1002/csc2.20333|issn=1435-0653|doi-access=free}}
• Garlic (Allium sativum var. sativum) – Allium atroviolaceum
• Leek (Allium ampeloprasum) – Welsh onion (Allium fistulosum)
• Lettuce (Lactuca sativa) – Prickly lettuce (Lactuca serriola)
• Mustard (Brassica juncea subsp. juncea) – Brassica carinata
• Onion (Allium cepa var. cepa) – Allium galanthum
• Rape (Brassica napus var. napus) – Common dogmustard (Erucastrum gallicum)
• Spinach (Spinacea oleracea) – Spinacia turkestanica
• Squash (Cucurbita pepo subsp. pepo) – Cucurbita okeechobeensis
• Turnip (Brassica rapa subsp. rapa) – Brassica rapa

• Almond (Prunus dulcis) – Chinese plum (Prunus salicina and many others)
• Apple (Malus domestica) – mostly Malus sieversii, but with some cultivars perhaps belonging to Malus sylvestris or being a hybrid of the two.
• Apricot (Prunus armeniaca) – Prunus brigantina
• Avocado (Persea americana) – Persea schiedeana
• Banana – Musa acuminata, Musa balbisiana and Musa schizocarpa{{Cite journal|last1=Eyland|first1=David|last2=Breton|first2=Catherine|last3=Sardos|first3=Julie|last4=Kallow|first4=Simon|last5=Panis|first5=Bart|last6=Swennen|first6=Rony|last7=Paofa|first7=Janet|last8=Tardieu|first8=François|last9=Welcker|first9=Claude|last10=Janssens|first10=Steven B.|last11=Carpentier|first11=Sebastien C.|date=2021|title=Filling the gaps in gene banks: Collecting, characterizing, and phenotyping wild banana relatives of Papua New Guinea|journal=Crop Science|language=en|volume=61|issue=1|pages=137–149|doi=10.1002/csc2.20320|s2cid=225195460 |issn=1435-0653|doi-access=free|hdl=10568/109912|hdl-access=free}}
• Breadfruit (Artocarpus altilis) – Jackfruit (Artocarpus heterphyllus)
• Cacao (Theobroma cacao) – Theobroma angustifolium
• Cherry (Prunus avium) – Prunus mahaleb
• Cucumber (Cucumis sativus) – Cucumis hystrix
• Eggplant (Solanum melongena) – Thorn apple (Solanum incanum), Solanum insanum{{Cite journal|last1=Kouassi|first1=Abou Bakari|last2=Kouassi|first2=Koffi Brice Aymar|last3=Sylla|first3=Zakaria|last4=Plazas|first4=Mariola|last5=Fonseka|first5=Ramya Malkanthi|last6=Kouassi|first6=Auguste|last7=Fonseka|first7=Hemal|last8=N'guetta|first8=Assanvo Simon-Pierre|last9=Prohens|first9=Jaime|date=2021|title=Genetic parameters of drought tolerance for agromorphological traits in eggplant, wild relatives, and interspecific hybrids|journal=Crop Science|language=en|volume=61|issue=1|pages=55–68|doi=10.1002/csc2.20250|s2cid=225378001 |issn=1435-0653|doi-access=free|hdl=10251/196627|hdl-access=free}}
• Grape (Vitis vinifera) – European wild grape (Vitis sylvestris). Hybrids exist also including other Vitis species.
• Grapefruit (Citrus paradisi) – Citrus medica
• Lemon (Citrus limon) – Citrus indica
• Mango (Mangifera indica) – Mangifera altissima
• Orange (Citrus sinensis) – Key lime (Citrus aurantiifolia)
• Papaya (Carica papaya) – Jarilla chocola
• Peach (Prunus persica var. persica) – Prunus tomentosa
• Pear (Pyrus communis) – Pyrus pyraster and Pyrus caucasica
• Pepper (Capsicum annuum) – Capsicum baccatum
• Pineapple (Ananas comosus) – Ananas bracteatus
• Plum (Prunus domesticus subsp. domestica)- Prunus spinosa and Prunus cerasifera
• Pumpkin (Cucurbita maxima subsp. maxima) – Cucurbita ecuadorensis
• Strawberry (Fragaria× ananassa)
• Tomato (Solanum lycopersicum) – Solanum chilense
• Watermelon (Citrullus lanatus var. lanatus) – Bitter apple (Citrullus colocynthis)

• Peanut (Arachis hypogaea subsp. hypogaea) – Arachis duranensis
• Sunflower (Helianthus annuus) – Helianthus exilis
• Soya (Glycine max) – Glycine clandestina
• Safflower (Carthamus tinctorius) – Carthamus creticus
• Rapeseed (Brassica napus) – Brassica rapa, Brassica oleracea

File:'Cajanus scarabaeoides' - a wild pigeonpea.jpg is one of the closest wild relatives to the cultivated pigeonpea and has high drought tolerance and high protein content. Being screened at the campus of the International Crops Research Institute for the Semi-Arid Tropics in Patancheru, India.]]

• Lentil (Lens culinaris) – Lens ervoides
• Garden Pea (Pisum sativum) – Pisum fulvum
• Butter Bean (Phaseolus lunatus) – Phaseolus augusti
• Garden Bean (Phaseolus vulgaris) – Phaseolus coccineus
• Faba Bean (Vicia faba) – Vicia johannis
• Grasspea (Lathyrus sativus) – Lathyrus tuberosus{{Cite journal|last1=Abdallah|first1=Fadoua|last2=Kumar|first2=Shiv|last3=Amri|first3=Ahmed|last4=Mentag|first4=Rachid|last5=Kehel|first5=Zakaria|last6=Mejri|first6=Rajia Kchaou|last7=Triqui|first7=Zine El Abidine|last8=Hejjaoui|first8=Kamal|last9=Baum|first9=Michael|last10=Amri|first10=Moez|date=2021|title=Wild Lathyrus species as a great source of resistance for introgression into cultivated grass pea (Lathyrus sativus L.) against broomrape weeds (Orobanche crenata Forsk. and Orobanche foetida Poir.)|journal=Crop Science|language=en|volume=61|issue=1|pages=263–276|doi=10.1002/csc2.20399|issn=1435-0653|doi-access=free}}
• Cowpea (Vigna unguiculata) – Vigna monantha
• Bambara groundnut (Vigna subterranea) – Vigna hosei
• Pigeonpea (Cajanus cajan) – Cajanus albicans, Cajanus scarabaeoides, Cajanus sericeus, Cajanus acutifolius{{Cite journal|last1=Khoury|first1=Colin K.|last2=Castañeda-Alvarez|first2=Nora P.|last3=Achicanoy|first3=Harold A.|last4=Sosa|first4=Chrystian C.|last5=Bernau|first5=Vivian|last6=Kassa|first6=Mulualem T.|last7=Norton|first7=Sally L.|last8=van der Maesen|first8=L. Jos G.|last9=Upadhyaya|first9=Hari D.|last10=Ramírez-Villegas|first10=Julian|last11=Jarvis|first11=Andy|date=2015-04-01|title=Crop wild relatives of pigeonpea [Cajanus cajan (L.) Millsp.]: Distributions, ex situ conservation status, and potential genetic resources for abiotic stress tolerance|journal=Biological Conservation|language=en|volume=184|pages=259–270|doi=10.1016/j.biocon.2015.01.032|issn=0006-3207|doi-access=free|bibcode=2015BCons.184..259K |hdl=10568/56841|hdl-access=free}}
• Chickpea (Cicer arietinum) – Cicer reticulatum, Cicer echinospermum{{Cite journal|last1=Sharma|first1=Shivali|last2=Lavale|first2=Shivaji Ajinath|last3=Nimje|first3=Chetna|last4=Singh|first4=Sube|date=2021|title=Characterization and identification of annual wild Cicer species for seed protein and mineral concentrations for chickpea improvement|journal=Crop Science|language=en|volume=61|issue=1|pages=305–319|doi=10.1002/csc2.20413|s2cid=233360422 |issn=1435-0653|doi-access=free}}
• Vetch (Vicia sativa) – Vicia barbazitae
• Adzuki bean (Vigna angularis var. angularis) – Vigna umbellata
• Black gram bean (Vigna mungo var. mungo) – Vigna grandiflora
• Mung bean (Vigna radiata var. radiata) – Vigna stipulacea

• Alfalfa (Medicago sativa) - Medicago arborea and Medicago truncatula{{Cite journal|last1=Humphries|first1=Alan W.|last2=Ovalle|first2=Carlos|last3=Hughes|first3=Steve|last4=Pozo|first4=Alejandro del|last5=Inostroza|first5=Luis|last6=Barahona|first6=Viviana|last7=Yu|first7=Linqing|last8=Yerzhanova|first8=Sakysh|last9=Rowe|first9=Trevor|last10=Hill|first10=Jeff|last11=Meiirman|first11=Galiolla|date=2021|title=Characterization and pre-breeding of diverse alfalfa wild relatives originating from drought-stressed environments|journal=Crop Science|language=en|volume=61|issue=1|pages=69–88|doi=10.1002/csc2.20274|issn=1435-0653|doi-access=free}}

• Sweet potato (Ipomoea batatas) – Ipomoea triloba, Ipomoea cynanchifolia, Ipomoea leucantha and Ipomoea trifida{{Cite journal|last1=Nhanala|first1=Stella E. C.|last2=Yencho|first2=G. Craig|date=2021|title=Assessment of the potential of wild Ipomoea spp. for the improvement of drought tolerance in cultivated sweetpotato Ipomoea batatas (L.) Lam|journal=Crop Science|language=en|volume=61|issue=1|pages=234–249|doi=10.1002/csc2.20363|s2cid=224985206 |issn=1435-0653|doi-access=free}}
• Cassava (Manihot esculenta subsp. esculenta) – Manihot walkerae
• Potato (Solanum tuberosum) – Solanum chacoense

• List of domesticated plants
• Wild type
• Agricultural biodiversity
• Agriculture
• Agronomy
• Gene pool
• Australian Grains Genebank
• Plant genetic resources

{{reflist|2}}

• [http://www.cwrdiversity.org/ Crop Wild Relatives Inventory and Gap Analysis]
• [http://www.pgrforum.org/ European Crop Wild Relative Diversity Assessment and Conservation Forum]
• [https://vimeo.com/67899663 Beyond the Gardens: The Crop Wild Relatives Project] (Vimeo Video)
• [https://web.archive.org/web/20090305190205/http://www.diverseeds.eu/uploads/media/Crop_Wild_Relatives_ver2.mp4] A short video on emmer wheat.
• [https://web.archive.org/web/20090305190205/http://www.diverseeds.eu/uploads/media/Crop_Wild_Relatives_ver2.mp4 Short DIVERSEEDS video on crop wild relatives in the fertile crescent in Israel]
• [https://archive.today/20121214053532/http://www.ars.usda.gov/ba/atlascwrguatemala Atlas of Guatemalan Crop Wild Relatives]
• [https://www.bioversityinternational.org/cwr/ Bioversity International - Crop Wild Relatives]

{{Cereals}}

Category:Agroecology

Category:Crops

Category:Habitat management equipment and methods