Normal view MARC view ISBD view

Building international cooperation : crucial to mitigate the threat from Ug99 race of stem rust and other rust pathogens

By: Singh, R.P.
Contributor(s): Huerta-Espino, J | Singh, D | Bhavani, S | Njau, P.N | Wanyera, R | Yue Jin | Herrera-Foessel, S | Singh, P.K | Braun, H.J | Ward, R.W | Coffman, R.
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Antalya, Turkey : METU, 2009Description: 1 page.Subject(s): International cooperation | StemsDDC classification: CIS-5644 Online resources: Access only for CIMMYT Staff In: International Cereal Rusts Powdery Mildews Conference : Antalya (Turkey); 13-16 Oct 2009, Abstract Book p. 1Summary: Race Ug99, or TTKSK, of fungus Puccinia graminis f. sp. 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, with further predicted spread towards North Africa, Middle East, 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 TTTSK, 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 the southern region of Kenya on the Sr24 carrying variety Kenya Mwamba and rendered about half of the previously known Ug99-resistant global wheat materials susceptible. This has further increased the vulnerability of wheat globally. Rigorous screening since 2005 in Kenya and Ethiopia of wheat materials from 22 countries and International Centers has identified resistant materials, although in low frequency, that have the potential to replace susceptible cultivars. Diverse sources of adequate resistance, both race-specific and adult-plant type, are now available in improved wheat backgrounds and are being used in breeding worldwide. Ug99 threat in most countries can be reduced to low levels by urgently identifying, releasing and providing to growers seed of new high yielding, resistant varieties. The Borlaug Global Rust Initiative (BGRI) was launched in 2005 to build international partnership, raise awareness and financial resources, develop and implement research and developmental priorities to mitigate the threat from Ug99. The consortium has been very successful in achieving these objectives and provides a model for tackling global issues including the threat posed by the yellow rust pathogen. Strong partnerships among and between institutions in developed and developing countries, and international centers will be necessary to bring long-term control of rust diseases in innovative ways through a better pathogen surveillance, development of critical screening sites and facilities, higher emphasis on the use of multiple minor genes in breeding varieties with nearimmune levels of resistance, identifying new sources of race-specific resistance genes and their deployment in combinations aided by marker-assisted breeding, and simplifying breeding by developing multiple resistance genes carried in cassettes following their cloning.
List(s) this item appears in: Ug99
Tags from this library: No tags from this library for this title. Log in to add tags.
    average rating: 0.0 (0 votes)
Item type Current location Collection Call number Status Date due Barcode Item holds
Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-5644 (Browse shelf) Available
Total holds: 0

Abstract only

Race Ug99, or TTKSK, of fungus Puccinia graminis f. sp. 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, with further predicted spread towards North Africa, Middle East, 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 TTTSK, 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 the southern region of Kenya on the Sr24 carrying variety Kenya Mwamba and rendered about half of the previously known Ug99-resistant global wheat materials susceptible. This has further increased the vulnerability of wheat globally. Rigorous screening since 2005 in Kenya and Ethiopia of wheat materials from 22 countries and International Centers has identified resistant materials, although in low frequency, that have the potential to replace susceptible cultivars. Diverse sources of adequate resistance, both race-specific and adult-plant type, are now available in improved wheat backgrounds and are being used in breeding worldwide. Ug99 threat in most countries can be reduced to low levels by urgently identifying, releasing and providing to growers seed of new high yielding, resistant varieties. The Borlaug Global Rust Initiative (BGRI) was launched in 2005 to build international partnership, raise awareness and financial resources, develop and implement research and developmental priorities to mitigate the threat from Ug99. The consortium has been very successful in achieving these objectives and provides a model for tackling global issues including the threat posed by the yellow rust pathogen. Strong partnerships among and between institutions in developed and developing countries, and international centers will be necessary to bring long-term control of rust diseases in innovative ways through a better pathogen surveillance, development of critical screening sites and facilities, higher emphasis on the use of multiple minor genes in breeding varieties with nearimmune levels of resistance, identifying new sources of race-specific resistance genes and their deployment in combinations aided by marker-assisted breeding, and simplifying breeding by developing multiple resistance genes carried in cassettes following their cloning.

Text in English

There are no comments for this item.

Log in to your account to post a comment.

Click on an image to view it in the image viewer

baner

International Maize and Wheat Improvement Center (CIMMYT) © Copyright 2015. Carretera México-Veracruz. Km. 45, El Batán, Texcoco, México, C.P. 56237.
Monday –Friday 9:00 am. 17:00 pm. If you have any question, please contact us at CIMMYT-Knowledge-Center@cgiar.org

Centro Internacional de Mejoramiento de Maíz y Trigo (CIMMYT) © Copyright 2015. Carretera México-Veracruz. Km. 45, El Batán, Texcoco, México, C.P. 56237.
Lunes –Viernes 9:00 am. 17:00 pm. Si tiene cualquier pregunta, contáctenos a CIMMYT-Knowledge-Center@cgiar.org