Ug99
Puccinia graminis | |
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Species: | P. graminis
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Subspecies: | P. graminis tritici
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Variety: | Ug99
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Ug99 is a lineage of wheat stem rust (Puccinia graminis f. sp. tritici), which is present in wheat fields in several countries in Africa and the Middle East and is predicted to spread rapidly through these regions and possibly further afield, potentially causing a wheat production disaster that would affect food security worldwide.[1] In 2005 the noted green revolution pioneer Norman Borlaug brought great attention to the problem, and most subsequent efforts can be traced to his advocacy.[2] It can cause up to 100% crop losses and is virulent against many resistance genes which have previously protected wheat against stem rust.
Although Ug99-resistant varieties of wheat do exist,[2] a screen of 200,000 wheat varieties used in 22 African and Asian countries found that only 5-10% of the area of wheat grown in these countries consisted of varieties with adequate resistance.[1]
The original race of Ug99, which is designated as 'TTKSK' under the North American nomenclature system, was first detected in Uganda in 1998[3] and first characterised in 1999[3] (hence the name Ug99) and has since been detected in Kenya, Ethiopia, Eritrea, Sudan, Yemen, Iran, Tanzania, Mozambique, Zimbabwe, South Africa,[4] and Egypt. There are now 15 known races of Ug99.[5] They are all closely related and are believed to have evolved from a common ancestor, but differ in their virulence/avirulence profiles and the countries in which they have been detected.[1]
Genetics
Ug99 is the product of a type of somatic nuclear exchange event which has not been observed in other stem rust races.[6] During this event and thereafter the nuclei have not experienced recombination.[6]
Gene resistance
Ug99 and its variants differ from other strains of the Black Stem Rust (BSR) pathogen due to their ability to overcome resistance genes in wheat that have been durable against the BSR pathogen for decades.[7] These resistant Sr genes, of which 50 are known, give wheat different resistances to stem rust.[3] The virulence in Uganda was virulent against Sr31 and is specific to Ug99.[3] The massive losses of wheat that have occurred have been devastating, but in recent years the wheat rust epidemic has been effectively controlled through selection and breeding for additional Sr genes.[3]
United States Department of Agriculture (USDA) researchers are testing genes to determine their Ug99 resistance, which will ultimately aid in the development of wheat varieties that will be able to fight off the rust. Resistance has been identified in a small number of spring wheat land races from North America - 23 out of 250 races with adult plant resistance, 27 out of 23,976 SNPs conveying APR, and only 9 races having seedling resistance.[8] This resistance was present prior to Ug99 pathogen challenge being present in NA to drive selection.[8]
In addition to the research being conducted by the USDA, The United Kingdom’s Department for International Development (DFID), along with Bill & Melinda Gates Foundation, announced in February 2011 that they will be granting $40 million to a global project led by Cornell University to combat virulent strains of Ug99.[9] The five-year grant to the Durable Rust Resistance in Wheat (DRRW) project supported attempts to identify new resistance genes as well as reproduce and distribute rust resistant wheat seeds to farmers.[9]
There has been a continuous process of development of new resistant cultivars and failure of those cultivars. This demonstrates the need for continuous improvement.[10]
As of 2020[update] modern molecular and molecular genetics techniques are identifying quantitative trait loci (QTLs), particular cellular structures, and individual R genes more efficiently than ever before.[11] These will be needed given the continuing severe, worldwide threat Ug99 poses.[11][1]
Races
There are 15 races of Ug99, which (under the North American nomenclature system) have the designations TTKSK, TTKSF, TTKST, TTTSK, TTKSP, PTKSK, PTKST, TTKSF+,[4] TTKTT, TTKTK, TTHSK, PTKTK, TTHST, TTKTT+, and TTHTT.[5] They are all closely related and are believed to have evolved from a common ancestor.[1]
TTKSK
Also known as PTKS.[12] The first Ug99 race to be characterised.[13][12] Like most Ug99 races, and unlike other stem rust varieties, it is virulent against the Sr gene Sr31;[13][12] also virulent against Sr38.[12] Avirulent against Sr24.[13][12] It was found in Uganda[12] in 1999, Kenya[13] in 2001,[5] Ethiopia in 2003,[5] Sudan and Yemen in 2006,[5] Iran in 2007,[5] and Tanzania[1] in 2009,[5] Eritrea in 2012,[5] and Rwanda and Egypt in 2014.[5]
TTKSF
First detected in South Africa in 2000,[5] Zimbabwe 2009,[5] and Uganda in 2012.[5]
TTKST
Discovered in Kenya in 2006[13] was the first Ug99 race found to be virulent against Sr gene Sr24.[1][13] TTKST is now the predominant stem rust race in Kenya.[1]
TTTSK
First detected in Kenya in 2007,[5] Tanzania in 2009,[5] Ethiopia in 2010,[5] Uganda in 2012,[5] and Rwanda in 2014.[5]
TTKSP
First detected in South Africa in 2007.[5]
PTKSK
First detected in Ethiopia in 2007,[5] Kenya in 2009,[5] Yemen in 2009,[5] and South Africa in 2017.[5][14]
PTKST
First detected in Ethiopia in 2007,[5] Kenya in 2008,[5] South Africa in 2009,[5] Eritrea and Mozambique and Zimbabwe in 2010.[5]
TTKSF+
First detected in both South Africa and Zimbabwe in 2010.[5] Virulent against Sr9h.[15][16][17]
TTKTT
First detected in Kenya in 2014.[5] Also detected in Iraq in 2019, the first such detection in the country.[5]
TTKTK
First detected in Kenya,[5][18] Rwanda,[5][18] Uganda,[5][18] Eritrea,[5] and Egypt[5][18] in 2014.
TTHSK
First detected in Kenya in 2014.[19] Differs from the original (TTKSK) by avirulence against Sr30.[19] Similar to TTHST.[19]
PTKTK
First detected in Kenya in 2014.[19] Differs from PTKSK by virulence against SrTmp.[19] Differs from TTKTK by avirulence against Sr21.[19]
TTHST
First detected in Kenya in 2013.[5]
TTKTT+
First detected in Kenya in 2019.[5] Virulent to Sr31, Sr24, SrTmp, and Sr8155B1.[5]
TTHTT
First detected in Kenya in 2020.[5] Virulent to Sr31, Sr24, and SrTmp, avirulent to Sr30.[5]
Timeline
1993
1998
- Severe stem rust infections observed in Uganda. Ug99 identified, characterised as having virulence on Sr31 and named.[20]
2000
- TTKSF detected in South Africa.[1]
2001
2003
2006
- TTKSK detected in Sudan and Yemen.[20]
- TTKST, a new variant of Ug99 with virulence to Sr24, detected in Kenya.[20]
2007
- TTTSK detected in Kenya.[1]
- TTKSP detected in South Africa.[1]
- PTKSK detected in Ethiopia.[1]
- PTKST detected in Ethiopia.[1]
2008
2009
- TTKSK detected in Tanzania.[1]
- TTKST detected in Tanzania.[1]
- TTTSK detected in Tanzania.[1]
- TTKSF detected in Zimbabwe.[1]
- PTKSK detected in Kenya.[1]
- PTKST detected in South Africa.[1]
2010
- TTKST detected in Eritrea.[4]
- PTKST detected in Eritrea.[4]
- PTKST detected in Mozambique.[4]
- PTKST detected in Zimbabwe.[4]
- TTKSF+ detected in South Africa.[4]
- TTKSF+ detected in Zimbabwe.[4]
2013
2014
- TTKTK confirmed in Egypt,[21] Kenya, Eritrea, Rwanda, and Uganda.[5]
- TTHSK confirmed in Kenya[5][19]
- PTKTK confirmed in Kenya[5][19]
- TTKTT confirmed in Kenya.[19]
- TTKST detected in Egypt.[21]
- TTKSK detected in Egypt.[21]
2017
- PTKSK confirmed in South Africa.[5]
2019
2020
Geographic spread
![]() | This section needs expansion. You can help by adding to it. (November 2020) |
China
Although Ug99 has not yet reached China,[22] other stem rust races already have,[22] and an effort is under way to marry resistance against present races with future needs for resistance against Ug99 whenever it arrives.[22]
Lebanon
Although Sr5, Sr21, Sr9e, Sr7b, Sr11, Sr6, Sr8a, Sr9g, Sr9b, Sr30, Sr17, Sr9a, Sr9d, Sr10, SrTmp, Sr38, and SrMcN are no longer effective in Lebanon, Sr11, Sr24, and Sr31 still are which is diagnostic for the absence of Ug99 from Lebanon.[23]
Iraq
South Asia
As of 2013[update] it was the US Director of National Intelligence's assessment that Ug99 would arrive in South Asia soon, in the following few years. This was expected to cause worldwide supply disruptions because, although productivity was growing in Eastern Europe and could theoretically fill that gap, governments worldwide had shown a readiness to forbid exports.[24] However as of April 2021[update] South Asia remains unaffected.[5]
See also
References
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{{cite journal}}
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