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United States Department of Agriculture

Agricultural Research Service

Research Project: California-Adapted Barleys for Resistance to Stem Rust (Ug99)

Location: Forage Seed and Cereal Research

2011 Annual Report


1a.Objectives (from AD-416)
Produce F3 populations of California-adapted barleys crossed with sources of genes for resistance to the Ug99 stem rust pathogen.


1b.Approach (from AD-416)
Make crosses between Ug99-resistant barley lines and various market types of barley adapted to California production. The Ug99 resistant lines will be from ICARDA/CIMMYT material previously tested by Brian Steffensen at University of Minnesota, hulless lines from UC Davis and spring 2-row barleys from Washington State University. The locally-adapted lines will include hulled spring barleys for malting. Conduct field evaluations of F2 populations for agronomic traits including cold tolerance and resistance to local diseases, then advance to the F3 generation for further testing. The materials resulting from this SCA will be available for further development and testing to select materials that are locally adapted and have resistance to Ug99. This SCA supports research conducted under National Program (NP) Number303, Plant Diseases. The research is conducted as part of ARS research project 5358-22000-035-00D, augmented by the FY2010 Program Increase for Research to Strengthen Grain Disease Research to Reduce World Hunger.


3.Progress Report

The spring barley Madre Selva (“MSel”), a parent among advanced lines from numerous crosses in the UC Davis malting germplasm subprogram, was tested for stem rust at Njoro, Kenya and found to be moderately resistant. Advanced lines from these crosses were sent to Kulumsa, Ethiopia and Njoro, Kenya for evaluation, and MSel was used to develop a mapping population.

New crosses were made in April 2011 to Ug99 resistant germplasm from barley breeding programs at Washington State University, Utah State University, North Dakota State University, University of Minnesota and Busch Ag. F1 plants are now being grown at Tulelake Experiment Station.

The project was monitored through site visits, meetings, email correspondence and review.


Last Modified: 7/25/2014
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