View source for Biology:Mutation breeding

'''Mutation breeding''', sometimes referred to as "'''variation breeding'''", is the process of exposing seeds to chemicals, [[Physics:Radiation|radiation]], or [[Biology:Enzyme|enzyme]]s<ref name="Chen-Wang-et-al-2019">{{cite journal | last1=Chen | first1=Kunling | last2=Wang | first2=Yanpeng | last3=Zhang | first3=Rui | last4=Zhang | first4=Huawei | last5=Gao | first5=Caixia | title=CRISPR/Cas Genome Editing and Precision Plant Breeding in Agriculture | journal=[[Biology:Annual Review of Plant Biology|Annual Review of Plant Biology]] | publisher=Annual Reviews | volume=70 | issue=1 | date=2019-04-29 | issn=1543-5008 | doi=10.1146/annurev-arplant-050718-100049 | pages=667–697| pmid=30835493 | s2cid=73471425 | doi-access=free }}</ref><ref name="Mackelprang-Lemaux-2020">{{cite journal | last1=Mackelprang | first1=Rebecca | last2=Lemaux | first2=Peggy G. | title=Genetic Engineering and Editing of Plants: An Analysis of New and Persisting Questions | journal=[[Biology:Annual Review of Plant Biology|Annual Review of Plant Biology]] | publisher=Annual Reviews | volume=71 | issue=1 | date=2020-04-29 | issn=1543-5008 | doi=10.1146/annurev-arplant-081519-035916 | pages=659–687| pmid=32023090 | s2cid=211049671 | doi-access=free }}</ref> in order to generate mutants with desirable traits to be bred with other cultivars.  Plants created using mutagenesis are sometimes called mutagenic plants or mutagenic seeds.
From 1930 to 2014 more than 3200 mutagenic plant varieties were released<ref name =FAO2014/><ref>{{Cite journal | last1 = Schouten | first1 = H. J. | last2 = Jacobsen | first2 = E. | doi = 10.1155/2007/82612 | title = Are Mutations in Genetically Modified Plants Dangerous? | journal = Journal of Biomedicine and Biotechnology | volume = 2007 | pages = 1–2 | year = 2007 | issue = 7 | pmid = 18273413| pmc =2218926 | doi-access = free }}</ref> that have been derived either as direct mutants (70%) or from their progeny (30%).<ref>{{cite journal |author1=M.K. Maluszynsk |author2=K. Nichterlein |author3=L. van Zanten |author4=B.S. Ahloowalia |title=Officially released mutant varieties – the FAO/IAEA Database|journal=Mutation Breeding Review|year=2000|issue=12|pages=1–84}}</ref> Crop plants account for 75% of released mutagenic species with the remaining 25% ornamentals or decorative plants.<ref name="iaea">{{cite journal|last=Ahloowali|first=B.S.|title=Global impact of mutation-derived varieties|journal=Euphytica|year=2004|volume=135|issue=2|pages=187–204|url=https://www.researchgate.net/publication/227278760|accessdate=20 April 2011|doi=10.1023/b:euph.0000014914.85465.4f|s2cid=34494057}}</ref>  However, although the FAO/[[Organization:International Atomic Energy Agency|IAEA]] reported in 2014 that over 1,000 mutant varieties of major staple crops were being grown worldwide,<ref name = FAO2014>(2014) [http://www-naweb.iaea.org/nafa/pbg/ Plant Breeding and Genetics] Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Retrieved 31 July 2014</ref> it is unclear how many of these varieties are currently used in agriculture or horticulture around the world, as these seeds are not always identified or labeled as having a mutagenic provenance.<ref name = Bloomberg>Kaskey, Jack (21 November 2013) [https://web.archive.org/web/20131122021904/http://www.businessweek.com/articles/2013-11-21/monsanto-vs-dot-mutant-crop-developers-in-global-seed-market The Scariest Veggies of Them All] Bloomberg Business Week, Retrieved 31 July 2014</ref>

== History ==

According to garden historian Paige Johnson: {{quote|text=After WWII, there was a concerted effort to find 'peaceful' uses for [[Physics:Atomic energy|atomic energy]]. One of the ideas was to bombard plants with radiation and produce lots of mutations, some of which, it was hoped, would lead to plants that bore more heavily or were disease or cold-resistant or just had unusual colors. The experiments were mostly conducted in giant gamma gardens on the grounds of national laboratories in the US but also in Europe and countries of the {{bracket|then-}}USSR.<ref>{{cite web|last=Johnson|first=Paige|title=Atomic Gardens|url=http://pruned.blogspot.com/2011/04/atomic-gardens.html|accessdate=20 April 2011}}</ref>}}

== Processes ==

There are different kinds of mutagenic breeding such as using chemical mutagens like [[Chemistry:Ethyl methanesulfonate|ethyl methanesulfonate]] and [[Chemistry:Dimethyl sulfate|dimethyl sulfate]], [[Physics:Radiation|radiation]] or transposons to generate [[Biology:Mutant|mutant]]s. Mutation breeding is commonly used to produce traits in crops such as larger seeds, new colors, or sweeter fruits, that either cannot be found in nature or have been lost during evolution.<ref>{{cite web|title=New Citrus Variety Released by UC Riverside is Very Sweet, Juicy and Low-seeded|url=http://newsroom.ucr.edu/news_item.html?action=page&id=2602}}</ref>

=== Radiation ===

Exposing plants to radiation is sometimes called radiation breeding and is a sub class of mutagenic breeding. Radiation breeding was discovered in the 1920s when Lewis Stadler of the [[Organization:University of Missouri|University of Missouri]] used [[Physics:X-ray|X-ray]]s on maize and barley. In the case of barley, the resulting plants were white, yellow, pale yellow and some had white stripes.<ref name="broad">{{cite news|last=Broad|first=William J.|title=Useful Mutants, Bred With Radiation|url=https://www.nytimes.com/2007/08/28/science/28crop.html|work=New York Times|accessdate=20 April 2011|date=28 August 2007}}</ref> In 1928, Stadler first published his findings on radiation-induced [[Biology:Mutagenesis|mutagenesis]] in plants.<ref name=":0" /> During the period 1930–2004, radiation-induced mutant varieties were developed primarily using [[Physics:Gamma ray|gamma ray]]s (64%) and X-rays (22%).<ref name="iaea" />{{rp|187}}

Radiation breeding may take place in [[Biology:Atomic gardening|atomic gardens]];<ref name=":0">[http://www.lifesciencesfoundation.org/magazine-Atomic_Gardens.html Atomic Gardens: Public Perceptions & Public Policy] {{webarchive|url=https://web.archive.org/web/20130630003254/http://www.lifesciencesfoundation.org/magazine-Atomic_Gardens.html |date=2013-06-30 }}, Life Sciences Foundation Magazine, Spring 2012.</ref> and seeds have been sent into orbit in order to expose them to more cosmic radiation.<ref>{{ cite web | last = Smith | first = Peter | title = How Radiation is Changing the Foods that You Eat | work = GOOD | publisher = GOOD Worldwide, Inc. | date = 2011-04-12 | url = http://www.good.is/post/how-radiation-is-changing-the-foods-that-you-eat/ | accessdate = 2011-07-16 }}</ref>

[[Physics:Ultraviolet|{{visible anchor|Ultraviolet}}]] has been used, for example to produce [[Biology:Gene knockout|knockouts]] for the investigation of [[Biology:Virulence|virulence]] mechanisms of plant pathogens.<ref name="Xu-et-al-2018">{{cite journal | last1=Xu | first1=Liangsheng | last2=Li | first2=Guoqing | last3=Jiang | first3=Daohong | last4=Chen | first4=Weidong | title=''Sclerotinia sclerotiorum'': An Evaluation of Virulence Theories | journal=[[Biology:Annual Review of Phytopathology|Annual Review of Phytopathology]] | publisher=Annual Reviews | volume=56 | issue=1 | date=2018-08-25 | issn=0066-4286 | doi=10.1146/annurev-phyto-080417-050052 | pages=311–338| pmid=29958073 | s2cid=49615444 | doi-access=free }}</ref>

=== Chemicals ===

High rates of chromosome aberrations resulting from ionizing radiation and the accompanied detrimental effects made researchers look for alternate sources for inducing mutations. As a result, an array of chemical mutagens has been discovered. The most widely used chemical mutagens are [[Chemistry:Alkylation#Alkylating agents|alkylating agents]]. [[Chemistry:Ethyl methanesulfonate|Ethyl methanesulfonate]] (EMS) is the most popular because of its effectiveness and ease of handling, especially its detoxification through hydrolysis for disposal. Nitroso compounds are the other alkylating agents widely used, but they are light-sensitive and more precautions need to be taken because of their higher volatility. EMS has become a commonly used mutagen for developing large numbers of mutants for screening such as in developing TILLING populations.<ref>[https://www.academia.edu/1027957/Plant_mutation_breeding_in_agriculture Pathirana, R.] Plant Mutation Breeding in Agriculture. CAB Reviews: Perspectives in Agriculture, Veterinary Science, Nutrition and Natural Resources. 2011 6 No 032</ref> Although many chemicals are mutagens, only few have been used in practical breeding as the doses need to be optimised and also because the effectiveness is not high in plants for many.{{cn|date=December 2022}}

=== Restriction endonucleases ===

Interest in the use of bacterial restriction endonucleases (RE) - for example Fok1<ref name="Mackelprang-Lemaux-2020" /> and CRISPR/[[Biology:Cas9|Cas9]]<ref name="Chen-Wang-et-al-2019" /><ref name="Mackelprang-Lemaux-2020" /> - to study double-stranded breaks in plant DNA began in the mid-nineties. These breaks in DNA, otherwise known as DSBs, were found to be the source of much chromosomal damage in eukaryotes, causing mutations in plant varieties. REs induce a result on plant DNA similar to that of ionizing radiation or radiomimetic chemicals. Blunt ended breaks in the DNA, unlike sticky ended breaks, were found to produce more variations in chromosomal damage, making them the more useful type of break for mutation breeding. While the connection of REs to chromosomal aberrations is mostly limited to research on mammalian DNA, success in mammalian studies caused scientists to conduct more studies of RE-induced chromosomal and DNA damage on barley [[Biology:Genome|genome]]s. Due to restriction endonucleases' ability to facilitate damage in chromosomes and DNA, REs have the capability of being used as a new method of mutagenesis to promote the proliferation of mutated plant varieties.<ref>{{Cite journal|last1=Stoilov|first1=L.|last2=Gecheff|first2=K.|year=2009|editor-last=Shu|editor-first=Q.Y.|title=Restriction Endonucleases as a Tool for In Vivo Induction of Chromosomal and DNA Damage in Barley Genome|url=http://www.fao.org/docrep/012/i0956e/I0956e.pdf|journal=Induced Plant Mutations in the Genomics Era|via=Food and Agriculture Organization of the United Nations}}</ref><ref name="Chen-Wang-et-al-2019" /><ref name="Mackelprang-Lemaux-2020" />

=== Space-breeding ===

The ability of plants to develop and thrive is dependent on conditions such as microgravity and cosmic radiation in space. China has been experimenting with this theory by sending seeds into space, testing to see if space flights will cause genetic mutations. Since 1987, China has cultivated 66 mutant varieties from space through their space-breeding program. Chromosomal aberrations greatly increased when seeds were sent into aerospace compared to their earth-bound counterparts. The effect of space flight on seeds depends on their species and variety. For example, space-bred wheat saw a large growth in seed germination in compared to its Earth-bound control, but space-bred rice had no visible advantage compared to its control. For the varieties that were positively mutated by space flight, their growth potential exceeded that of not only their Earth-grown counterparts, but also their irradiated counterparts on Earth. Compared to traditional mutagenic techniques, space-bred mutations have greater efficacy in that they experience positive effects on their first generation of mutation, whereas irradiated crops often see no advantageous mutations in their first generations. Though multiple experiments have shown the positive effects of space flight on seed mutation, there is no clear connection as to what aspect of aerospace has produced such advantageous mutations. There is much speculation around cosmic radiation being the source of chromosomal aberrations, but so far, there has been no concrete evidence of such connection. Though China's space-breeding program has been shown to be very successful, the program requires a large budget and technological support that many other countries are either unwilling or unable to provide, meaning this program is unfeasible outside of China. Due to such restraints, scientists have been trying to replicate space condition on Earth in order to promote the same expedient space-born mutations on Earth. One such replication is a [[Physics:Magnetic field|magnetic field]]-free space (MF), which produces an area with a weaker magnetic field than that of Earth. MF treatment produced mutagenic results, and has been used to cultivate new mutant varieties of rice and alfalfa. Other replications of space conditions include irradiation of seeds by a heavy 7 Li-ion beam or mixed high-energy particles.<ref>{{Cite journal|last1=Liu|first1=L.X.|last2=Guo|first2=H.J.|last3=Zhao|first3=L.S.|last4=Wang|first4=J.|last5=Zhao|first5=S.R.|year=2009|editor-last=Shu|editor-first=Q.Y.|title=Achievements and Perspectives of Crop Space Breeding in China|url=http://www.fao.org/docrep/012/i0956e/I0956e.pdf|journal=Induced Plant Mutations in the Genomics Era|via=Food and Agriculture Organization of the United Nations}}</ref> These space-bred varieties are already being introduced to the public. In 2011, during the National Lotus Flowers Exhibition in China, a mutant lotus, called the "Outer Space Sun", was shown at the flower show.<ref>{{Cite news|url=https://www.youtube.com/watch?v=GqXpUivgfeY|title=Mutant Lotus Bred in Space on Display in Chongqing, China}}</ref>

=== Ion beam technology ===

[[Physics:Ion beam|Ion beam]]s mutate DNA by [[Biology:Deletion (genetics)|deleting]] multiple bases from the genome. Compared to traditional sources of radiation, like gamma rays and X-rays, ion beams have been shown to cause more severe breaks in DNA that are more difficult to weave back together, causing the change in DNA to be more drastic than changes caused by traditional irradiation. Ion beams change DNA in a manner that makes it look vastly different than its original makeup, more so than when traditional irradiation techniques are used. Most experimentation, using ion beam technology, has been conducted in Japan. Notable facilities using this technology are TIARA of the [[Organization:Japan Atomic Energy Agency|Japan Atomic Energy Agency]], RIKEN Accelerator Research Facility, and various other Japanese institutions. During the process of ion beam radiation, seeds are wedged between two [[Chemistry:Kapton|kapton]] films and irradiated for roughly two minutes. Mutation frequencies are notably higher for ion beam radiation compared to electron radiation, and the mutation spectrum is broader for ion beam radiation compared to gamma ray radiation. The broader mutation spectrum was revealed through the largely varied amount of flower [[Biology:Phenotype|phenotype]]s produced by ion beams. Flowers mutated by the ion beams exhibited a variety of colors, patterns, and shapes. Through ion beam radiation, new varieties of plants have been cultivated. These plants had the characteristics of being [[Physics:Ultraviolet|ultraviolet]] light-B resistant, disease resistant, and [[Biology:Chlorophyll|chlorophyll]]-deficient. Ion beam technology has been used in the discovery of new genes responsible for the creation of more robust plants, but its most prevalent use is commercially for producing new flower phenotypes, like striped [[Biology:Chrysanthemum|chrysanthemum]]s.<ref>{{Cite journal|last=Tanaka|first=A.|year=2009|editor-last=Shu|editor-first=Q.Y.|title=Establishment of Ion Beam Technology for Breeding|url=http://www.fao.org/docrep/012/i0956e/I0956e.pdf|journal=Induced Plant Mutations in the Genomics Era|via=Food and Agriculture Organization of the United Nations}}</ref>

=== Mature pollen treated with gamma radiation ===

Gamma radiation is used on mature rice pollen to produce parent plants used for crossing. The mutated traits in the parent plants are able to be inherited by their offspring plants. Because rice pollen has a very short lifespan, researchers had to blast gamma rays at cultured spikes from rice plants. Through experimentation, it was revealed that there was a greater variety of mutation in irradiated pollen rather than irradiated dry seeds. Pollen treated with 46Gy of gamma radiation showed an increase in grain size overall and other useful variations. Typically, the length of each grain was longer after the crossing of irradiated parent rice plants. The rice progeny also exhibited a less chalky visage, improving on the appearance of the parent rice plants. This technique was used to develop two new rice cultivars, Jiaohezaozhan and Jiafuzhan, in China. Along with facilitating the creation of these two rice cultivars, the irradiation of mature rice pollen has produced roughly two hundred mutant rice lines. Each of these lines produce rice grains of both a higher quality and larger size. The mutations produced by this technique vary with each generation, meaning further breeding of these mutated plants could produce new mutations. [[Biology:Atomic gardening|Traditionally]], gamma radiation is used on solely adult plants, and not on pollen. The irradiation of mature pollen allows mutant plants to grow without being in direct contact with gamma radiation. This discovery is in contrast to what was previously believed about gamma radiation: that it could only elicit mutations in plants and not pollen.<ref>{{Cite journal|last1=Wang|first1=H.|last2=Qiu|first2=S.|last3=Zheng|first3=J.|last4=Jiang|first4=L.|last5=Huang|first5=H.|last6=Huang|first6=Y.|year=2009|editor-last=Shu|editor-first=Q.Y.|title=Generation of New Rice Cultivars from Mature Pollen Treated with Gamma-Radiation|url=http://www.fao.org/docrep/012/i0956e/I0956e.pdf|journal=Induced Plant Mutations in the Genomics Era|via=Food and Agriculture Organization of the United Nations}}</ref>

== Comparison to other techniques ==

In the [[Philosophy:Genetically modified food controversies|debate over genetically modified foods]], the use of transgenic processes is often compared and contrasted with mutagenic processes.<ref>[http://www.gmsciencedebate.org.uk/report/pdf/gmsci-report1-full.pdf UK Government Science Review First Report], Prepared by the GM Science Review panel (July 2003). Chairman Professor Sir David King, Chief Scientific Advisor to the UK Government, P 9: "...it is necessary to produce about 100 GM plants to obtain one that has the desirable characters for its use as a basis of a new GM crop variety. ... Most of these so-called conventional plant breeding methods (such as gene transfer by pollination, mutation breeding, cell selection and induced polyploidy) have a substantially greater discard rate. Mutation breeding, for instance, involves the production of unpredictable and undirected genetic changes and many thousands, even millions, of undesirable plants are discarded in order to identify plants with suitable qualities for further breeding."</ref> While the abundance and variation of transgenic organisms in human food systems, and their effect on agricultural biodiversity, [[Philosophy:Genetically modified food controversies#Environment|ecosystem health]] and [[Philosophy:Genetically modified food controversies#Health|human health]] is somewhat well documented, mutagenic plants and their role on human food systems is less well known, with one journalist writing "Though poorly known, radiation breeding has produced thousands of useful mutants and a sizable fraction of the world's crops...including varieties of rice, wheat, barley, pears, peas, cotton, peppermint, sunflowers, peanuts, grapefruit, sesame, bananas, cassava and sorghum."<ref name=broad/> In Canada crops generated by mutation breeding face the same regulations and testing as crops obtained by genetic engineering.<ref>The Canadian regulatory system is based on whether a product has novel features regardless of method of origin.  In other words, a product is regulated as genetically modified if it carries some trait not previously found in the species whether it was generated using mutation breeding or genetic engineering (or any other method including [[Biology:Selective breeding|selective breeding]]).</ref><ref>Evans, Brent and Lupescu, Mihai (15 July 2012) [http://gain.fas.usda.gov/Recent%20GAIN%20Publications/Agricultural%20Biotechnology%20Annual_Ottawa_Canada_07-20-2012.pdf Canada - Agricultural Biotechnology Annual – 2012] {{Webarchive|url=https://web.archive.org/web/20131215160309/http://gain.fas.usda.gov/Recent%20GAIN%20Publications/Agricultural%20Biotechnology%20Annual_Ottawa_Canada_07-20-2012.pdf |date=2013-12-15 }} GAIN (Global Agricultural Information Network) report CA12029, United States Department of Agriculture, Foreifn Agricultural Service, Retrieved 7 August 2014</ref><ref>{{cite book |last=McHugen |first=Alan |title=Pandora's Picnic Basket |publisher=Oxford University Press |date=September 14, 2000 |chapter=Chapter 1: Hors-d'oeuvres and entrees/What is genetic modification? What are GMOs? |isbn=978-0198506744 |url-access=registration |url=https://archive.org/details/pandoraspicnicba00mchu }}</ref><ref>{{cite book |last=Rowland |first=G.G. |editor-first=Q. Y. |editor-last=Shu |title=Induced Plant Mutations in the Genomics Era |publisher= Plant Breeding Section, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, International Atomic Energy Agency, Vienna, Austria |url= http://inis.iaea.org/search/search.aspx?orig_q=RN:42072723 |date=2009 |pages=423–424 |chapter=Chapter 110: The Effect of Plants With Novel Traits (PNT) Regulation on Mutation Breeding in Canada |isbn=978-92-5-106324-8}}</ref> Mutagenic varieties tend to be made freely available for plant breeding, in contrast to many commercial plant varieties or germplasm that increasingly have restrictions on their use<ref name="iaea" />{{rp|187}} such as terms of use, [[Social:Patent|patent]]s and proposed [[Engineering:Genetic use restriction technology|genetic user restriction technologies]] and other [[Social:Intellectual property|intellectual property]] regimes and modes of enforcement.

Unlike [[Biology:Genetically modified crops|genetically modified crops]], which typically involve the insertion of one or two target genes, plants developed via mutagenic processes with random, multiple and unspecific genetic changes<ref>[https://www.nytimes.com/2007/08/28/science/28crop.html Useful Mutants, Bred With Radiation], by William J. Broad, New York Times, August 28, 2007.</ref> have been discussed as a concern<ref>[http://www.ams.usda.gov/AMSv1.0/getfile?dDocName=STELPRDC5102656 Discussion Document Excluded Methods Terminology], National Organic Standards Board GMO ad hoc Subcommittee paper, U.S. Agricultural Marketing Service, published February 6, 2013.</ref> but are not prohibited by any nation's organic standards. Reports from the US National Academy of Sciences state that there is no scientific justification for regulating genetic engineered crops while not doing so for mutation breeding crops.<ref name = Bloomberg/>

Several organic food and seed companies promote and sell certified organic products that were developed using both chemical and nuclear mutagenesis.<ref name=Fedoroff>[https://books.google.com/books?id=PwkOVO9BbnkC&dq Mendel in the Kitchen: A Scientist's View of Genetically Modified Foods], By Nina V. Fedoroff and Nancy Marie Brow, pg. 17, Joseph Henry Press, 2004.</ref> Several certified organic brands, whose companies support strict labeling or outright bans on GMO-crops, market their use of branded wheat and other varietal strains which were derived from mutagenic processes without any reference to this genetic manipulation.<ref name=Fedoroff/>  These organic products range from mutagenic barley and wheat ingredient used in organic beers<ref>[http://beeradvocate.com/beer/profile/188/2697 Golden Promise Organic Ale]</ref> to mutagenic varieties of grapefruits sold directly to consumers as organic.<ref>[http://www.wasatchorganics.com/products-page/grapefruit/organic-henderson-grapefruit-duplicate/ Wasatch Organic Rio Red Grapefruit]</ref>

== Release by nation ==

As of 2011 the percentage of all mutagenic varieties released globally, by country, were:<ref name="iaea" />{{rp|187}}<ref name = Academia>Pathirana, Ranjith (September 6, 2011) [https://www.academia.edu/1027957/Plant_mutation_breeding_in_agriculture Plant mutation breeding in agriculture] CAB Reviews: Perspectives in Agriculture, Veterinary Science, Nutrition and Natural Resources (CAB International); 20116 (032): 1 – 20; doi:10.1079/PAVSNNR20116032; ISSN 1749-8848; Retrieved August 6, 2014</ref>
* (25.2%) {{PRC}}
* (15.0%) {{JPN}}
* (11.5%) {{IND}}
* (6.7%)  {{RUS}}
* (5.5%)  {{NED}}
* (5.3%)  {{DEU}}
* (4.3%)  {{USA}}
* (2.4%)  {{BGR}}
* (1.7%)  {{VNM}}
* (1.4%)  {{BGD}}

Notable varieties per country include:

; {{ARG}}:
* Colorado Irradiado [[Biology:Peanut|groundnut]] (mutant created with X-rays; high fat content and yield, 80% of groundnuts grown in Argentina in the 1980s was Colorado Irradiado)<ref name=":2" />
* Puita INTA-CL [[Biology:Rice|rice]] mutant (herbicide resistance and good yield; also grown in Bolivia, Brazil, Costa Rica and Paraguay)<ref name=":2" />
; {{AUS}}
* Amaroo rice mutant variety (60-70% of rice grown in Australia was Amaroo in 2001)<ref name=":2" />
; {{BGD}}:
* Binasail, Iratom-24 and Binadhan-6 rice mutants<ref name=":2" />
* Binamoog-5 [[Biology:Mung bean|mung bean]] mutant variety<ref name=":2" />
; {{CUB}}:
* Maybel [[Biology:Tomato|tomato]] mutant (excellent drought resistance)<ref name=":2" />
* GINES rice mutant (created using proton radiation; grows well in salty conditions)<ref name=":2" />
; {{PRC}}:
* Henong series [[Biology:Soybean|soybean]] mutants<ref name=":2">{{Cite journal|last1=Kharkwal|first1=M. C.|last2=Shu|first2=Q. Y.|year=2008|title=The role of induced mutations in world food security|url=https://mvd.iaea.org/PDF/IPM200901.pdf|journal=Induced Plant Mutations in the Genomics Era. Proceedings of an International Joint FAO/IAEA Symposium, 2008 2009|location=Vienna, Austria|publisher=Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, International Atomic Energy Agency|pages=33–38|isbn=9789251063248}}</ref>
* Jiahezazhan and Jiafuzhan rice (mutations obtained by pollen irradiation; high yield and quality, very adaptable, resistant to plant hopper and blast)<ref name=":2" />
* Lumian Number 1 cotton<ref name=":1">{{Cite book|title=Plant Mutation Breeding and Biotechnology|last=Shu|first=Qing-Yao|publisher=CABI Publishing|year=2012|isbn=978-1780640853|editor-last=Forster|editor-first=B. P.|pages=17|editor-last2=Nakagawa|editor-first2=H.}}</ref>
* Purple Orchard 3 [[Biology:Sweet potato|Sweet potato]]<ref>{{cite news|title=Lift-off for Chinese space potato|url=http://news.bbc.co.uk/2/hi/6353403.stm | work=BBC News | date=12 February 2007}}</ref>
* Tiefeng 18 soybean<ref name=":2" />
* Yangdao Number 6 rice<ref name=":1" />
* Yangmai 156 wheat<ref name=":1" />
* Zhefu 802 rice mutant (irradiated with gamma rays; resistant to rice blast, good yield even in poor conditions, the most planted rice variety between 1986-1994)<ref name="Euphytica">{{Cite journal | last1 = Ahloowalia | first1 = B. S. | last2 = Maluszynski | first2 = M. | journal = Euphytica | volume = 118 | title = Production Process in Old and Modern Spring Barley Varieties| issue = 2 | pages = 167 | year = 2001 | doi = 10.1023/A:1004162323428 | s2cid = 36088943 }}</ref>
* 26Zhaizao indica rice mutant (created with gamma rays)<ref name="Euphytica" />
{{CZE}}
* Diamant [[Biology:Barley|barley]] (high yield, short height mutant created with X-Rays)<ref>Lipavsky, J. Petr, J. and Hradecká, D, (2002) "Production Process in Old and Modern Spring Barley Varieties" Die Bodenkultur, 53 (1) 2, Page 19</ref>
; {{EGY}}:
* Giza 176 and Sakha 101 high yield rice mutants<ref name=":2" />
; {{FIN}}:
* Balder J barley mutant (better drought resistance, yield and sprouting)<ref name=":2" />
* Puhti and Ryhti stiff straw oat mutants<ref name=":2" />
; {{FRA}}:
* High oleic sunflowers (covering more than 50 % of the sunflower acreage)
; {{DEU}}:
* Trumpf barley<ref name=":2" />
; {{GHA}}:
* Tek bankye mutant [[Biology:Cassava|cassava]] (good poundability and increased dry matter content)<ref name=":2" />
; {{IND}}:
* Co-4, Pant Mung-2, and TAP mung bean mutants<ref name=":2" />
* MA-9 cotton - the world's first mutant cotton, released in 1948 (X-ray radiation; [[Biology:Drought tolerance|drought tolerance]], high yielding)<ref name=":2" />
* PNR-381 [[Biology:Rice|Rice]]<ref name="iaea" />{{rp|189}}
* Pusa 408 (Ajay), Pusa 413 (Atul), Pusa 417 (Girnar), and Pusa 547 chickpea mutants (resistant to Ascochyta blight and wilt diseases, and have high yields)<ref name=":2" />
* Sharbati Sonora [[Biology:Wheat|wheat]]<ref name="iaea" />{{rp|189}}
* Tau-1,<ref name=":1" /> MUM 2, BM 4, LGG 407, LGG 450, Co4, Dhauli (TT9E) and Pant moong-1 blackgram (YMC, (Yellow mosaic virus) resistance)<ref name="iaea" />{{rp|189}}
* TG24 and TG37 groundnut mutants<ref name=":1" />
; {{ITA}}:
* Durum [[Biology:Wheat|wheat]] (especially Creso mutant, created with thermal neutrons)<ref>{{cite web|url=http://old.enea.it/produzione_scientifica/pdf_EAI/2010/6/CasoCreso.pdf|title=Il miglioramento genetico del grano duro in Casaccia. Il caso CRESO|last=Rossi|first=Luigi|date=2010|website=Energia, Ambiente e Innovazione|publisher=ENEA|trans-title=Genetic Improvement of Durum Wheat in Casaccia. The Creso Case|access-date=2016-11-29|archive-date=2016-11-30|archive-url=https://web.archive.org/web/20161130035923/http://old.enea.it/produzione_scientifica/pdf_EAI/2010/6/CasoCreso.pdf|url-status=dead}}</ref><ref>{{Cite book|title=Mutation Breeding: Theory and Practical Applications|last=van Harten|first=A. M.|publisher=Cambridge University Press|year=1998|isbn=978-0521470742|location=U. K.|pages=239}}</ref>
; {{JPN}}:
* Osa Gold [[Biology:Pear|Pear]] (disease resistance) <ref>{{cite web|url=http://www.google.com/patents?id=mKEGAAAAEBAJ|title=Japanese pear tree named 'Osa Gold'|last=Kotobuki|first=Kazuo|accessdate=20 April 2011}}</ref>
* Most rice varieties grown in Japan have the sd1 mutant allele from the Reimei rice variety<ref name=":1" />
; {{MMR}}:
* Shwewartun rice mutant (created by irradiating IR5 rice to give better yield, grain quality and earlier maturity)<ref name=":2" />
; {{PAK}}:
* Basmati 370 short height rice mutant<ref name=Euphytica/>
* NIAB-78 [[Biology:Cotton|cotton]] mutant (high yielding, heat tolerant, early maturing)<ref name=Euphytica/>
* CM-72 [[Biology:Chickpea|chickpea]] mutant (created with 150Gy of gamma rays; high yielding, blight resistant)<ref name = NIAB>(2008) [http://www.niab.org.pk/mutation.htm NIAB - Plant Breeding & Genetics Division, Achievements] Nuclear Institute for Agriculture and Biology, Faisalabad, Pakistan, Retrieved 16 May 2013</ref>
* NM-28 mungbean mutant (short height, uniform and early maturing, high seed yield)<ref name = NIAB/>
* NIAB Masoor 2006 [[Biology:Lentil|lentil]] mutant (created with 200Gy of radiation; early maturing, high yield, resistant to disease)<ref name = NIAB/>
; {{PER}}:
* UNA La Molina 95 [[Biology:Barley|barley]] mutant (developed in 1995 for growing above 3,000 m)<ref name = FAOPeru>(2012) [http://www-naweb.iaea.org/nafa/news/pbg-barley-peru.html Improved barley varieties - Feeding people from the equator to the arctic] Joint FAO/IAEAProgramme, Nuclear Techniques in Food and Agriculture, Retrieved 25 October 2013</ref>
* Centenario Amarinth "kiwicha" mutant (high quality grain and exported as a certified organic product)<ref name = FAOPeru/>
* Centenario II [[Biology:Barley|barley]] mutant (developed for growing in the Andean highlands with high yield, high quality flour and tolerance to hail)<ref name = FAOPeru/>
; {{SDN}}:
* Albeely banana mutant (better quality, high yield and better stand)<ref name=":2" />
; {{THA}}:
* RD15 and RD6 aromatic [[Biology:Oryza sativa|indica rice]] mutants (created with gamma rays and released in 1977-8; RD 15 is early ripening, RD6 has a valuable glutinous endosperm).  Thailand is the biggest exporter of aromatic rice in the world<ref name=":2" />
; {{GBR}}:
* [[Biology:Golden Promise|Golden Promise]] barley (semi-dwarf, salt tolerant mutant created with gamma rays)<ref name="autogenerated1">{{Cite journal | last1 = Forster | first1 = B. P. | journal = Euphytica | volume = 120 | issue = 3 | pages = 317–328 | doi = 10.1023/A:1017592618298 | year = 2001 | title = Mutation genetics of salt tolerance in barley: An assessment of Golden Promise and other semi-dwarf mutants| s2cid = 22320510 }}</ref> Is used to make beer and whisky<ref>{{cite news|last=Broad|first=William|title=Useful Mutants, Bred With Radiation|url=https://www.nytimes.com/2007/08/28/science/28crop.html?pagewanted=all&_r=1&|accessdate=2013-06-19|newspaper=New York Times|date=2007-08-28}}</ref>
; {{USA}}:
* Calrose 76 [[Biology:Rice|Rice]] (short height rice induced with gamma rays)<ref name="iaea" />{{rp|189}}
* Luther and Pennrad barley (high yield mutant varieties; Pennrad also resistant to winter)<ref name=":2" />
* Murray Mitcham [[Biology:Peppermint|Peppermint]] ([[Biology:Verticillium wilt|''Verticillium'' wilt tolerance]])<ref name="iaea" />{{rp|189}}
* Sanilac [[Biology:Navy bean|bean]] (X-ray radiation; high yielding mutant - also the Gratiot and Sea-way bean varieties were cross-bred from Sanilac)<ref name=":2" />
* Stadler wheat (high yield mutant with resistance to loose smut and leaf rust and earlier maturity)<ref name=":2" />
* Star Ruby and Rio red varieties of the Rio Star [[Biology:Grapefruit|Grapefruit]] (created using thermal neutron techniques)<ref name="iaea" />{{rp|189}}
* Todd's Mitcham [[Biology:Peppermint|Peppermint]] ([[Biology:Verticillium wilt|''Verticillium'' wilt tolerance]])<ref name="iaea" />{{rp|189}}
; {{VIE}}:
* VND 95-20, VND-99-1 and VN121 [[Biology:Rice|rice]] mutants (increased yield, improved quality, resistance to disease and pests)<ref name = FAOVN>(2012) [http://www-naweb.iaea.org/nafa/news/pbg-vietnam-story.html Successful Mutation Breeding Programmes in Vietnam] Joint FAO/IAEAProgramme, Nuclear Techniques in Food and Agriculture, Retrieved 25 October 2013</ref><ref name = PlantMutations/>
* DT84, DT96, DT99 and DT 2008 [[Biology:Soybean|soybean]] mutants (developed using gamma rays to grow three crops a year, tolerance to heat and cold and resistance to disease)<ref name = PlantMutations>Vinh, M.Q. et al (2009) [http://mvd.iaea.org/PDF/12-CS10-6-191-VINH_unreviewed.pdf Current Status and Research Directions of Induced Mutation Application to Seeds Program in Vietnam] in Induced Plant Mutations in the Genomics Era, FAO of the UN, Rome, Pp 341-345, Web page version retrieved 25 October 2013</ref>
In 2014, it was reported that 17 rice mutant varieties, 10 soybean, two maize and one chrysanthemum mutant varieties had been officially released to Vietnamese farmers. 15% of rice and 50% of soybean was produced from mutant varieties.<ref>(2014) [http://www-naweb.iaea.org/nafa/news/pbg-vietnam-story.html Successful Mutation Breeding Programmes in Vietnam] Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Retrieved 31 July 2014</ref>

== See also ==
* [[Biology:Atomic gardening|Atomic gardening]]

== References ==

{{Reflist}}

== External links ==
* {{cite web | title=Institute of Radiation Breeding | trans-website=National Agriculture and Food Research Organization | website=農研機構 {{!}} 国立研究開発法人農業・食品産業技術総合研究機構 | date=2013-03-13 | url=http://www.naro.affrc.go.jp/archive/nias/eng/org/GR/IRB/ | language=ja | access-date=2021-08-08}}
* [http://mvd.iaea.org The Joint FAO/IAEA Mutant Variety Database (MVD)]
* {{cite web | title=Mutation breeding | website=[[Organization:International Atomic Energy Agency|International Atomic Energy Agency]] (IAEA) | date=2016-04-13 | url=http://www.iaea.org/topics/mutation-breeding | access-date=2021-08-08}}

{{Breed}}

[[Category:Biotechnology]]
[[Category:Mutagenesis]]

{{Sourceattribution|Mutation breeding}}