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Published on: March 10, 2020
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Seedling Resistance Genes 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
|March 1, 2019
Summary
This study identified leaf rust resistance genes in soft red winter wheat lines, finding Lr3, Lr10, and Lr11 to be most common. Understanding these genes is crucial for durable disease management in wheat.
Area of Science:
- Plant genetics
- Agricultural science
- Crop pathology
Background:
- Managing leaf rust in wheat relies on seedling and adult-plant resistance, but genetic information on contemporary cultivars is limited.
- Lack of knowledge on resistance genes hinders durability assessment and gene pyramiding strategies for leaf rust (caused by Puccinia triticina).
Purpose of the Study:
- To determine the genetic basis of race-specific seedling resistance to leaf rust in 116 soft red winter wheat lines.
- To identify specific leaf rust resistance (Lr) genes present in advanced breeding lines and cultivars.
Main Methods:
- Evaluated seedling infection types of wheat lines and isolines against 22 races of Puccinia triticina under controlled conditions.
- Utilized a computer program to analyze infection data and postulate the presence of specific Lr genes.
Main Results:
- Identified Lr genes 1, 2a, 2c, 3, 3ka, 9, 10, 11, 14a, 18, 20, 23, 24, and 26 in the tested wheat lines.
- Genes Lr3, Lr10, and Lr11 were the most frequently detected resistance genes.
- Fifty-four lines possessed unidentified Lr genes, and only four lines showed resistance to all tested races, likely due to Lr9, Lr24, and Lr26.
Conclusions:
- Established the presence and frequency of various Lr genes in contemporary soft red winter wheat.
- Highlighted the importance of Lr3, Lr10, and Lr11 for leaf rust resistance in this germplasm.
- Identified specific lines with potentially durable resistance combinations for future breeding efforts.
Keywords:
gene-for-gene specificity
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