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United States Department of Agriculture

Agricultural Research Service

Research Project: CEREAL RUST FUNGI: GENETICS, POPULATION BIOLOGY, AND HOST-PATHOGEN INTERACTIONS

Location: Cereal Disease Laboratory

Title: Leaf rust resistance in selected Uruguayan late maturity common wheat cultivars

Authors
item German, S -
item Kolmer, James

Submitted to: Euphytica
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: July 1, 2013
Publication Date: July 18, 2013
Citation: German, S.E., Kolmer, J.A. 2013. Leaf rust resistance in selected Uruguayan late maturity common wheat cultivars. Euphytica. 52:606-608.

Interpretive Summary: Wheat is attacked by a fungus called Puccinia triticina that causes the disease wheat leaf rust. Wheat leaf rust is very common in both North America and South America. Wheat has genes that give resistance to the fungus. The purpose of this study was to identify which leaf rust resistance (Lr) genes are present in wheat cultivars from Uruguay. The genes Lr3bg, Lr10, Lr13, Lr14a, Lr16, Lr23, Lr26, Lr24, Lr17, and Lr34 were identified in six wheat cultivars from Uruguay. This information will be useful to plant breeders for improving leaf rust resistance in wheat.

Technical Abstract: Leaf rust (caused by Puccinia triticina) is one of the most important diseases of wheat in Uruguay, therefore and breeding for resistance to this disease has been a priority for the INIA wheat breeding development program. Knowledge of the resistance genes present in the germplasm is relevant to breed selection for effective and more durable resistance. The leaf rust resistance genes present in six adapted wheat cultivars that are parents of many advanced lines were studied. Races of Puccinia triticina with different virulence combinations were used to determine which seedling resistance genes may be present in six cultivars and/or derived lines. Genetic analysis of seedling and adult plant resistance (APR) was conducted on BC1F2 and F3 generations from the crosses of four cultivars with the susceptible cultivar Thatcher. The presence of APR genes Lr13 and/or Lr34 was confirmed with crosses of the cultivars used for genetic analysis and the Thatcher lines with these genes. A genetic marker associated with gene Lr34 was used to postulate the presence of this gene in all studied cultivars. The resistance genes postulated to be present in the cultivars were: Estanzuela Calandria Lr3bg, Lr16, Lr24 and Lr34; Estanzuela Federal Lr10; Estanzuela Halcón Lr10, Lr14a, Lr16 and Lr23; INIA Tijereta and INIA Garza Lr16, Lr24 and Lr34; and INIA Torcaza Lr10 and Lr24. Additional seedling resistance that could not be identified was present in E. Federal, E. Halcón, I. Tijereta and I. Torcaza. Additional APR gene(s) present in E. Calandria and E. Federal could be addtional APR.

Last Modified: 8/31/2014
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