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POSTERS: Genetics of Resistance I

P-277 - Against the Bacterial Streak: The Fight to Save Wheat

Monday, August 4, 2025
3:45 PM - 4:30 PM HST
Location: Exhibit Hall 3

    Presenting Author(s)

  • GA

    Gazala Ameen, n/a

    Assistant Professor
    Department of Agronomy, Horticulture and Plant Science, South Dakota State University, Brookings, SD 57007
    Brookings, South Dakota, United States

    • Author(s)

  • MA

    Muhammad Ahmad, n/a

    Graduate Research Assistant/ Ph.D. Student
    Department of Agronomy, Horticulture, and Plant Sciences,South Dakota State University
    Brookings, South Dakota, United States

  • TP

    Tapish PAWAR, n/a

    Graduate Research Assistant/ Ph.D. studnet
    Department of Agronomy, Horticulture, and Plant Sciences,South Dakota State University
    Brookings, South Dakota, United States

  • SS

    Shyam Solanki, n/a

    Assistant Professor
    Department of Agronomy, Horticulture and Plant Science, South Dakota State University, Brookings, SD 57007
    Brookings, South Dakota, United States

  • KD

    Karl D. Glover, n/a

    Professor
    Department of Agronomy, Horticulture, and Plant Sciences,South Dakota State University
    Brookings, South Dakota, United States

  • JH

    Jose L. Gonzalez Hernandez, n/a

    Professor
    Department of Agronomy, Horticulture and Plant Science, South Dakota State University, Brookings, SD 57007
    Brookings, South Dakota, United States

  • JD

    Jeffrey D. Boehm Jr., n/a

    USDA Research Geneticist
    University of Nebraska-Lincoln East Campus, USDA-ARS, Lincoln
    Lincoln, Florida, United States

  • GB

    Guihua Bai

    USDA-ARS Hard Winter Wheat Genetics Research Unit
    Manhattan, Kansas, United States

  • MA

    Meriem Aoun

    Oklahoma State University
    Stillwater, Oklahoma, United States

Abstract Text: Bacterial leaf streak (BLS), caused by Xanthomonas translucens pv. undulosa (Xtu), poses a significant threat to wheat production, with potential yield losses of up to 60% in the Northern Great Plains of the U.S. Since no effective chemical controls are available, genetic resistance remains the most viable management strategy. This study aims to identify BLS resistance sources and DNA markers linked to resistance genes using genome-wide association studies (GWAS) on elite wheat germplasm. Utilizing a diverse wheat panel of winter wheat lines from nine U.S. states, GWAS uncovered nine marker-trait associations (MTAs) for BLS resistance across nine chromosomes, pinpointing key genomic regions involved in resistance, with the largest effect on Chromosome 1B. While initial surveys and infection assays focused on Xtu as the primary pathogen, our results revealed that Pantoea ananatis and P. agglomerans also infect wheat, producing similar symptoms. Consequently, it is imperative to unravel the host resistance mechanism against all three bacterial pathogens to achieve sustainable BLS management. Notably, our preliminary results indicate that resistance to Xtu may not provide protection against Pantoea spp., highlighting the complexities of disease management. Investigating these phyllosphere bacterial interactions is essential for improving disease diagnosis and developing long-term BLS control strategies for wheat production.