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Updated: Jan 28, 2026
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VIGS-Mediated Forward Genetics Screening for Identification of Genes Involved in Nonhost Resistance
Published on: August 23, 2013
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Genes for Adult-Plant Resistance to Leaf Rust in Soft Red Winter Wheat
Yeshi A Wamishe1, Eugene A Milus1
1Department of Plant Pathology, University of Arkansas, Fayetteville 72701.
Plant Disease
|February 24, 2019
Summary
Most wheat cultivars possess durable adult-plant resistance to leaf rust, with many lines showing resistance due to known genes Lr12, Lr13, or Lr34. This study highlights the prevalence and effectiveness of adult-plant resistance in wheat breeding.
Area of Science:
- Plant Pathology
- Agronomy
- Genetics
Background:
- Host plant resistance is crucial for managing wheat leaf rust (Puccinia triticina).
- Durable resistance strategies increasingly focus on adult-plant resistance (APR) over seedling resistance.
Purpose of the Study:
- To investigate the genetic basis of adult-plant resistance in wheat.
- To identify effective methods for detecting APR genes Lr12, Lr13, and Lr34.
- To assess the prevalence of these APR genes in contemporary soft red winter wheat cultivars.
Main Methods:
- Inoculation of wheat flag leaves with a virulent pathogen race.
- Phenotypic evaluation of infection types under controlled and field conditions.
- Association of resistance with known APR genes (Lr12, Lr13, Lr34) based on specific resistance profiles and linked markers.
Main Results:
- Approximately 90% of 116 wheat lines exhibited adult-plant resistance.
- Resistance was attributed to Lr12 (17 lines), Lr34 (27 lines), and Lr13 (23 lines) based on distinct phenotypic responses.
- A significant portion (40%) of resistance was due to unidentified APR genes, indicating diverse genetic sources.
Conclusions:
- Adult-plant resistance is highly prevalent in modern soft red winter wheat cultivars.
- Known APR genes (Lr12, Lr13, Lr34) contribute significantly to this resistance.
- Adult-plant resistance can be effectively incorporated into wheat germplasm, even alongside strong seedling resistance.
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