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Multi-location wheat stripe rust QTL analysis: genetic background and epistatic interactions
M Dolores Vazquez1, Robert Zemetra, C James Peterson
1Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, 97331-2902, USA, m.dolores.vazquez@oregonstate.edu.
Summary
Genetic background and epistasis significantly influence wheat stripe rust resistance. Major quantitative trait loci (QTL) and minor QTL were identified in two wheat populations, providing insights for breeding durable resistance.
Area of Science:
- Plant genetics and breeding
- Crop pathology
- Agricultural science
Background:
- Stripe rust (Puccinia striiformis f. sp. tritici) is a major global wheat disease.
- Developing durable resistance is crucial but challenging due to pathogen evolution and gene interactions.
- Understanding genetic control of resistance is key for effective breeding strategies.
Purpose of the Study:
- To identify chromosomal regions associated with stripe rust resistance in two winter wheat populations.
- To investigate the genetic architecture, including major genes and quantitative trait loci (QTL), underlying resistance.
- To analyze epistatic interactions and the influence of genetic background on resistance expression.
Main Methods:
- Utilized two winter wheat recombinant inbred line (RIL) populations evaluated across seven environments.
- Employed Diversity Array Technology (DART) and simple sequence repeat (SSR) markers for genetic mapping.
- Performed quantitative trait loci (QTL) analysis and analysis of variance (ANOVA) on phenotypic data.
Main Results:
- Significant genotypic differentiation for stripe rust resistance was observed (P < 0.01).
- In the 'Einstein'/'Tubbs' population, two major QTL on chromosomes 2AS and 6AL with epistatic interaction controlled resistance.
- In the 'Tubbs'/'NSA-98-0995' population, eight QTL were identified, with major contributions from chromosomes 2AL and 2BL.
Conclusions:
- Epistasis and genetic background are significant factors in stripe rust resistance.
- Identified specific QTL provide targets for marker-assisted selection in wheat breeding programs.
- Findings contribute to developing wheat varieties with enhanced and durable resistance to stripe rust.
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