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ARS Home » Midwest Area » St. Paul, Minnesota » Cereal Disease Lab » Research » Publications at this Location » Publication #219721
Title: Characterization of seedling infection types and adult plant infection responses of known Sr genes to race TTKS of Puccinia graminis f. sp. tritici

Author
item Jin, Yue
item SINGH, RAVI - CIMMYT
item WARD, RICK - CIMMYT
item WANYERA, RUTH - KENYA ARI
item KINYUA, MIRIAM - KENYA ARI
item NJAU, PETER - KENYA ARI
item FETCH, TOM - AGRI-FOOD CANADA
item YAHOUYI, AMOR - ICARDA
item PRETORIOUS, ZAK - ICARDA

Submitted to: Plant Disease
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/20/2007
Publication Date: 9/1/2007
Citation: Jin, Y., Singh, R.P., Ward, R.W., Wanyera, R., Kinyua, M., Njau, P., Fetch, T., Yahouyi, A., Pretorious, Z. 2007. Characterization of seedling infection types and adult plant infection responses of known Sr genes to race TTKS of Puccinia graminis f. sp. tritici. Plant Disease. 91:1096-1099.

Interpretive Summary: Stem rust historically was one of most destructive diseases of wheat and barley. The disease has been under effective control through the widespread use of host resistance. A number of stem rust resistance genes in wheat have been characterized for their reactions to specific races of P. graminis f. sp. tritici. Host responses to race TTKS in monogenic lines of Sr genes at the adult plant stage, a direct measurement of the effectiveness for a given gene, have not been investigated to any extent. This report summarizes the specific responses to race TTKS of monogenic lines of designated Sr genes based on evaluations in a field stem rust nursery planted in Njoro, Kenya in 2005 and 2006. The understanding of the effectiveness of individual Sr genes against race TTKS will facilitate the utilizations of these genes in breeding for stem rust resistance in wheat.

Technical Abstract: Stem rust, caused by Puccinia graminis f. sp. tritici, historically was one of most destructive diseases of wheat and barley. The disease has been under effective control through the widespread use of host resistance. A number of stem rust resistance genes in wheat have been characterized for their reactions to specific races of the stem rust pathogen. Race TTKS is a recently emerged stem rust strain in eastern African with broad virulence on stem rust resistance genes in wheat. Monogenic lines of Sr genes at the adult plant stage have not been investigated to any extent. This report summarizes the specific responses to race TTKS of monogenic lines of designated Sr genes based on evaluations in a field stem rust nursery planted in Njoro, Kenya in 2005 and 2006. Susceptibility to race TTKS at the seedling and adult plant stages was observed on monogenic lines carrying Sr5, 6, 7a, 7b, 8a, 8b, 9a, 9b, 9d, 9g, 10, 11, 12, 15, 16, 17, 18, 19, 20, 23, 30, 21, 34, 38, and Wld-1. Monogenic lines of resistance genes Sr13, 22, 24, 25, 26, 27, 28, 32, 33, 35, 36, 37, 39, 40, 44, Tmp, and Tt-3 were effective against TTKS both at the seedling and adult plant stages. The level of resistance conferred by these genes at the adult plant stage varied between highly resistant to moderately susceptible. The understanding of the effectiveness of individual Sr genes against race TTKS will facilitate the utilizations of these genes in breeding for stem rust resistance in wheat.