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ARS Home » Plains Area » Fargo, North Dakota » Edward T. Schafer Agricultural Research Center » Cereal Crops Improvement Research » Research » Publications at this Location » Publication #415378
Research Project: Improvement of Disease and Pest Resistance in Barley, Durum, Oat, and Wheat Using Genetics and Genomics

Location: Cereal Crops Improvement Research

Title: Dissection of nonhost resistance in barley to the heterologous leaf rust pathogen Puccinia triticinay

Author
item RITZINGER, MITCH - North Dakota State University
item ZHONG, SHAOBIN - North Dakota State University
item Yang, Shengming

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 6/1/2024
Publication Date: 6/10/2024
Citation: Ritzinger, M., Zhong, S., Yang, S. 2024. Dissection of nonhost resistance in barley to the heterologous leaf rust pathogen Puccinia triticinay. Meeting Abstract. 2024 Annual Meeting of the North Central Division of the American Phytopathological Society.

Interpretive Summary:

Technical Abstract: Barley and wheat leaf rusts are important diseases caused by the biotrophic fungi, Puccinia hordei and P. tritici, respectively. Annual losses to leaf rust diseases range from 1 to 20%, but can reach 60% under epidemic conditions. These fungi possess a suite of effectors, have high evolutionary and dispersal capabilities, and are highly host-specific. Infection compatibility is typically determined by interactions between the pathogens’ avirulence (Avr) genes and host resistance (R) genes. However, several studies have reported host plant accessions exhibiting significant levels of susceptibility to a typically incompatible pathogen- termed “heterologous infections”. Our group has identified two wild barley accessions, WBDC016 and WBDC103, which are susceptible to multiple common races of P. tritici. To dissect the genetic basis of the observed susceptibility, crosses with each were made with the resistant cultivar Rasmusson, and linkage mapping was performed with the derived F2 progeny. In the former population, significant quantitative trait loci (QTL) were identified on chromosomes 4H and 7H; in the latter, QTL were detected on chromosome 6H (2) and 7H. The results of this research could ultimately provide valuable insights into the basis of nonhost resistance and inform new strategies for controlling leaf rusts of cereals.