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Mapping crown rust resistance at multiple time points in elite oat germplasm.

Ian G McNish1, Cristiano M Zimmer2, Alexander Q Susko1

  • 1Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, 1991 Upper Buford Circle, 411 Borlaug Hall, St. Paul, MN, 55108.

The Plant Genome
|October 5, 2020
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Summary

Crown rust resistance in oats is complex. This study identified six quantitative trait loci (QTL) for resistance, highlighting the importance of temporal variation in genetic mapping for oat breeding.

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Area of Science:

  • Plant Pathology
  • Agronomy
  • Genetics

Background:

  • Crown rust, caused by *Puccinia coronata f. sp. avenae*, is a major threat to cultivated oat (*Avena sativa* L.) production.
  • Genetic resistance is the preferred management strategy, but its genetic architecture, especially considering temporal dynamics, remains poorly understood.

Purpose of the Study:

  • To investigate the genetic architecture of crown rust resistance in elite oat lines.
  • To assess the impact of temporal variation on quantitative trait loci (QTL) mapping for disease resistance.

Main Methods:

  • Genotyping-by-sequencing of elite oat lines from North American breeding programs.
  • Phenotypic evaluation of crown rust severity across multiple time points in three environments.
  • Genome-wide association mapping (GWAS) incorporating temporal disease data and multi-environment models.

Main Results:

  • Six QTL for crown rust resistance were identified on linkage groups Mrg05, Mrg12, Mrg15, Mrg18, Mrg20, and Mrg33.
  • A single QTL on Mrg15 was consistently detected across models, while others were specific to single time points, underscoring temporal variation's role.
  • No overlap was found between crown rust resistance QTL and a detected QTL for days-to-heading on Mrg02.

Conclusions:

  • Temporal variation significantly influences the detection and characterization of QTL for plant disease resistance.
  • High-density temporal data offers potential for more precise understanding of plant resistance mechanisms in oats and other crops.
  • Understanding temporal QTL dynamics is crucial for developing durable crown rust resistance in oat breeding programs.