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Global status of Ug99 spread and efforts to mitigate the threat

By: Singh, R.P.
Contributor(s): Herrera-Foessel, S.A [coaut.] | Jin, Y [coaut.] | Njau, P [coaut.] | Singh, D [coaut.] | Singh, G.P.|Prabhu,K.V.|Singh, A.M [eds] | Wanyera, R [coaut.] | Huerta-Espino, J [coaut.] | Bhavani, S [coaut.] | Singh, P.K [coaut.] | Hodson, D.P [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: New Delhi, India Indian Agricultural Research Institute : 2008Description: p. 4-11.Online resources: Access only for CIMMYT Staff Summary: Race Ug99, or TTKSK, of fungus Puccinia graminis tritici, causing stem or black rust disease on wheat (Triticum aestivum) has been recognized as a major threat to wheat production. First detected in Uganda in 1998 and now spread throughout East Africa, Yemen, Sudan and Iran and its further predicted spread towards North Africa, Middle East, and Asia and beyond has raised serious concerns of major epidemics that could destroy the wheat crop in various areas. Detection of two new Ug99 variants TTKST and TTSSK, detected in Kenya in 2006 and 2007 with virulence to genes Sr24 and Sr36, respectively, also show that Ug99 is evolving. The TTKST variant caused severe epidemics in 2007 in some regions of Kenya and rendered about half of the previously known Ug99-resistant global wheat materials susceptible. This has further increased the vulnerability globally. Rigorous screening since 2005 in Kenya and Ethiopia of wheat materials from 22 countries and International Centers has identified low frequency of resistant materials that have potential to replace susceptible cultivars. Diverse sources of adequate resistance, both race-specific and adult-plant type, are now available in high-yielding wheat backgrounds and are being used in breeding. Ug99 threat in most countries can be reduced to low levels by urgently identifying, releasing and providing seed of new high yielding, resistant varieties.
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-5702 (Browse shelf) Available
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Race Ug99, or TTKSK, of fungus Puccinia graminis tritici, causing stem or black rust disease on wheat (Triticum aestivum) has been recognized as a major threat to wheat production. First detected in Uganda in 1998 and now spread throughout East Africa, Yemen, Sudan and Iran and its further predicted spread towards North Africa, Middle East, and Asia and beyond has raised serious concerns of major epidemics that could destroy the wheat crop in various areas. Detection of two new Ug99 variants TTKST and TTSSK, detected in Kenya in 2006 and 2007 with virulence to genes Sr24 and Sr36, respectively, also show that Ug99 is evolving. The TTKST variant caused severe epidemics in 2007 in some regions of Kenya and rendered about half of the previously known Ug99-resistant global wheat materials susceptible. This has further increased the vulnerability globally. Rigorous screening since 2005 in Kenya and Ethiopia of wheat materials from 22 countries and International Centers has identified low frequency of resistant materials that have potential to replace susceptible cultivars. Diverse sources of adequate resistance, both race-specific and adult-plant type, are now available in high-yielding wheat backgrounds and are being used in breeding. Ug99 threat in most countries can be reduced to low levels by urgently identifying, releasing and providing seed of new high yielding, resistant varieties.

Global Wheat Program|Socioeconomics Program

English

Jose Juan Caballero

INT2843|INT2868|INT2550|INT2833|INT0610

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