U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 Cereal Disease Lab: St. Paul, MN
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    Careers


        


                    Cereal Rust Bulletins
                    PublicationsSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




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





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            BRIGGS, JORDAN - University Of Minnesotaitem
                                            CHEN, SHISHENG - University Of Californiaitem
                                            ZHANG, WENJUN - University Of Californiaitem
                                            NELSON, SARAH - University Of Minnesotaitem
                                            DUBCOVSKY, JORGE - University Of Californiaitem
                                            Rouse, Matthew

                                                         - *Matt*
  Submitted to: Phytopathology
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 3/29/2015
                                    Publication  Date: 4/6/2015
                                    Citation: Briggs, J., Chen, S., Zhang, W., Nelson, S., Dubcovsky, J., Rouse, M.N. 2015. Mapping of SrTm4, a recessive stem rust resistance gene from diploid wheat effective to Ug99. Phytopathology. 105:1347-1354.Interpretive Summary: Wheat stem rust is a fungal disease of wheat that decreases yield. A strain of the wheat stem rust fungus known as Ug99 emerged in Uganda in 1999 and threatens global wheat production because it is able to infect nearly all wheat varieties. We characterized a fourth stem rust resistance gene from a wheat relative species called Einkorn wheat, that provides resistance to Ug99 and all other tested races of the stem rust pathogen. We identified the location of this gene, that we call SrTm4, within a specific wheat chromosome arm. The molecular markers that we identified as linked to this gene can be used to aid introgression of SrTm4 into bread wheat to select for resistance to Ug99 and other races of the stem rust pathogen. The identification these molecular markers will facilitate the improvement of resistance of United States wheat cultivars to the dangerous Ug99. Ug99 resistant wheat cultivars will protect United States wheat production from yield loss if a Ug99 epidemic were to occur in the United States.
                                Technical Abstract: Race TTKSK (or Ug99) of Puccinia graminis f. sp. tritici (Pgt), the causal agent of wheat stem rust, is a serious threat to wheat production worldwide. The best approach to reduce this threat is to identify and deploy new stem rust resistance genes. Diploid wheat, Triticum monococcum (genome Am), has wild and cultivated forms, that have been utilized previously for the introgression of stem rust resistance genes Sr21, Sr22, and Sr35. Multi-pathotype seedling tests of biparental populations demonstrated that T. monococcum accession PI 306540 from Romania, contains a different recessive resistance gene effective to all Pgt races screened so far (including race TTKSK), which we will refer to as SrTm4 (fourth stem rust resistance gene characterized from T. monococcum). Using two mapping populations derived from crosses of PI 272557 × PI 306540 and G3116 × PI 306540, we mapped SrTm4 on chromosome arm 2AmL within a 2.1 cM interval flanked by sequence-tagged markers BQ461276 and DR732348, which corresponds to a 240-kb region in Brachypodium chromosome 5. The eight microsatellite and nine sequence-tagged markers linked to SrTm4 will facilitate the introgression of this resistance gene into hexaploid wheat and accelerate the deployment of SrTm4-mediated Ug99 resistance in common wheat breeding programs.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov