Accelerating Resistance Breeding: Emerging Methods to Identify and Validate Plant Immunity Genes

Area of Science:

• Plant Pathology
• Genetics
• Genomics

Background:

• Plant pathogens cause significant crop yield losses, necessitating effective disease resistance breeding.
• Plant immunity relies on genes like nucleotide-binding site leucine-rich repeat (NLR) and pattern-recognition receptors (PRR).
• Traditional genetic association studies have been successful but have limitations.

Purpose of the Study:

• To review emerging techniques for identifying and validating plant immunity genes.
• To discuss how novel functional approaches accelerate resistance breeding.
• To outline opportunities and future directions in plant immunity gene discovery.

Main Methods:

• Mutagenesis with R gene enrichment sequencing (MutRenSeq).
• Single-cell RNA sequencing.
• Advances in RenSeq-derived methods, spatial omics, proximity labelling, computational prediction, CRISPR screens, and cell death assays.

Main Results:

• MutRenSeq identified wheat resistance genes Sr22 and Sr45.
• Single-cell RNA sequencing revealed ZmChit7 in maize epidermal and guard cells.
• Emerging techniques offer advantages over traditional methods, including speed and mechanistic insights.

Conclusions:

• Novel functional genomics approaches are reshaping plant resistance breeding pipelines.
• These methods accelerate the identification and validation of causal variants for disease resistance.
• Continued development and combination of these techniques are crucial for future plant breeding efforts.