Unraveling Effects of miRNAs Associated with APR Leaf Rust Resistance Genes in Hybrid Forms of Common Wheat (Triticum aestivum L.)

Summary

This experimental study unravels the molecular mechanisms of adult plant resistance (APR) to leaf rust in common wheat by profiling expression patterns of key resistance genes and associated microRNAs across early infection stages. Using hybrid wheat crosses between the resistant cultivar Glenlea and Polish wheat varieties, the authors employed RT-qPCR to track temporal changes in APR gene (Lr34, Lr46, Lr67) expression and miRNA regulation in response to Puccinia triticina inoculation. The findings contribute toward understanding the molecular basis of durable, race-non-specific resistance, with implications for breeding strategies.

UK applicability

Leaf rust caused by Puccinia triticina is a significant pathogen of wheat in UK and northern European climates. Understanding APR gene expression mechanisms and miRNA-mediated regulation could inform UK wheat breeding programmes developing durable resistance varieties adapted to temperate conditions and multiple fungal races.

Key measures

RT-qPCR expression profiles of APR genes (Lr34, Lr46, Lr67) and miRNAs; timepoints at 0, 6, 12, 24, and 48 hours post-inoculation (hpi); segregating F2 and BC1F1 hybrid wheat generations

Outcomes reported

The study measured differential expression profiles of three adult plant resistance (APR) genes and associated microRNAs in wheat hybrid generations at five timepoints (0–48 hours) following Puccinia triticina fungal inoculation. Results demonstrated temporal variation in APR gene and miRNA expression during leaf rust infection progression.

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