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Validating Molecular Markers for Barley Leaf Rust Resistance Genes Rph20 and Rph24.

P M Dracatos¹, R F Park¹, D Singh¹

¹Sydney Institute of Agriculture, Plant Breeding Institute, The University of Sydney, Narellan 2567, NSW, Australia.

|September 24, 2020

Summary

Developing new molecular markers for barley leaf rust resistance genes Rph20 and Rph24 aids breeding. These markers enable efficient selection of barley genotypes with enhanced resistance to Puccinia hordei.

Keywords:

adult plant resistance codominant marker leaf rust marker assisted selection

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Published on: February 20, 2012

Area of Science:

Plant breeding
Molecular genetics
Crop protection

Background:

Barley leaf rust, caused by Puccinia hordei, significantly impacts global barley production.
Improving adult plant resistance (APR) is a key breeding objective for sustainable agriculture.
Genes Rph20 and Rph24 provide effective, interactive resistance common in European and Australian barley.

Purpose of the Study:

To develop and validate codominant PCR-based markers for Rph20 and Rph24 resistance alleles.
To facilitate high-throughput selection of barley genotypes with enhanced leaf rust resistance.

Main Methods:

Development of insertion-deletion (indel) based PCR markers.
Validation of marker predictivity for resistance alleles Rph20.ai and Rph24.an.
Utilizing molecular markers for marker-assisted selection in barley breeding programs.

Main Results:

Successfully developed codominant indel markers for Rph20 and Rph24.
Markers demonstrated high predictivity for the targeted resistance alleles.
These markers facilitate efficient selection for multiple resistance genes.

Conclusions:

The developed markers are valuable tools for barley breeders.
Efficient selection for Rph20 and Rph24 will accelerate the deployment of resistant barley varieties.
This contributes to improved crop stewardship and yield stability in the face of leaf rust pressure.