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G Fedak, W Cao, D Wolfe

    Tsitologiia I Genetika
    |November 29, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Researchers introgressed Fusarium Head Blight (FHB) resistance from Elymus repens into wheat. A specific chromosome 3D translocation was identified as the source of this valuable disease resistance in wheat breeding.

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    Area of Science:

    • Plant breeding
    • Genetics
    • Agronomy

    Background:

    • Fusarium Head Blight (FHB) poses a significant threat to wheat production worldwide.
    • Developing wheat cultivars with durable FHB resistance is a key objective in plant breeding.
    • Elymus repens is a potential source of novel genetic resistance to FHB.

    Purpose of the Study:

    • To introgress FHB resistance from Elymus repens into the wheat cultivar Crocus.
    • To identify the chromosomal basis of FHB resistance in the introgressed lines.
    • To evaluate the potential of the resistant lines for wheat breeding programs.

    Main Methods:

    • A cross between Elymus repens and wheat cultivar Crocus was performed.
    • BC1F7 progeny were advanced using single seed descent.

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  • Agronomic performance and FHB resistance were evaluated in an epiphytotic nursery.
  • Genomic in situ hybridization (GISH) and SSR markers were used for chromosomal analysis.

    • Main Results:

    • Sixteen lines were selected for agronomic performance, and eight showed FHB resistance.
    • Line P1142-3-1-5 possessed a 3D chromosome with telomeric translocations.
    • FHB resistance was attributed to a translocation on the long arm of chromosome 3D.
    • The resistant line exhibited minimal linkage drag.

    Conclusions:

    • A novel source of FHB resistance has been successfully introgressed into wheat.
    • The translocation on chromosome 3D is responsible for conferring FHB resistance.
    • This translocation offers a promising tool for breeding disease-resistant wheat varieties with minimal undesirable genetic material.