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ARS Home » Midwest Area » St. Paul, Minnesota » Cereal Disease Lab » Research » Publications at this Location » Publication #343351

Research Project: Cereal Rust: Pathogen Biology and Host Resistance

Location: Cereal Disease Lab

Title: Registration of spring wheat sources of the resistance genes Lr53, Lr56, Lr59 and Lr62

item MARAIS, GIDEON - North Dakota State University
item MCCALLUM, BRENT - Agriculture And Agri-Food Canada
item Kolmer, James - Jim
item PIRSEYEDI, SEYED-MOSTAFA - North Dakota State University
item BISEK, BRADLEY - North Dakota State University
item SOMO, MOHAMED - North Dakota State University

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/12/2017
Publication Date: 1/10/2018
Citation: Marais, G.F., McCallum, B., Kolmer, J.A., Pirseyedi, S., Bisek, B.R., Somo, M. 2018. Registration of spring wheat sources of the resistance genes Lr53, Lr56, Lr59 and Lr62. Journal of Plant Registrations. 12:157-161.

Interpretive Summary: Wheat is attacked by the leaf rust fungus, Puccinia triticina. Genes in wheat can provide resistance to this important pathogen and disease of wheat. Spring wheat lines with leaf rust resistance genes Lr53, Lr56, Lr59, and Lr62 all initially came from wild relatives of wheat. These genes were transferred to spring wheat and the amount of DNA from the wild relatives was reduced, which will make these genes easier for wheat breeders to add to breeding germplasm. The four genes give very high resistance to the current leaf rust population in North America.

Technical Abstract: Spring wheat (Triticum aestivum L.) germplasm with the alien derived leaf rust (caused by Puccinia triticina Erikss) resistance genes, Lr53, Lr56, Lr59, and Lr62 has been developed with infrastructure and financial support provided consecutively by the University of Stellenbosch (South Africa), the Cereal Research Centre (Agriculture and Agri-food Canada), and North Dakota State University (USA). A Thatcher near-isogenic line carrying Lr53 (Reg. no., PI) has been derived, while, following allosyndetic pairing induction, numerous recombinants of the Lr56, Lr59, and Lr62 translocations have been produced and mapped. The shortest and potentially most useful recombinants have been identified and named Lr56-157 (Reg. no., PI), Lr59-151 (Reg. no., PI) and Lr62-129 (Reg. no., PI). The four resistance genes may be homoeo-allelic since they have similar locations at the telomeric ends of either of the chromosome 6AS or 6BS arms, appear to give strong major gene resistance to a broad range of P. triticina races, occur in the proximity of the Xdupw217 simple sequence repeat locus and, except for Lr59 (which derives from a smaller primary introgression), were loosely associated with a stripe rust resistance locus in the original translocations. Extended testing with eleven current US pathotypes of P. triticina confirmed the presence of strong and potentially broad resistance.