Advances in Wheat Rust Resistance: Challenges, and Management Strategies

Breeding wheat for resistance to major rust diseases stem rust (Puccinia graminis), stripe rust (Puccinia striiformis), and leaf rust (Puccinia triticina) is a pivotal strategy for advancing sustainable agronomic systems, safeguarding yield potential, and reducing dependence on fungicides. This effort employs race-specific resistance genes, including Lr47, Lr52, Yr5, Yr10, Yr36, Sr31, and Sr24, which confer high efficacy against specific pathogen races but are vulnerable to evolving virulent strains. To complement this, durable adult plant resistance (APR) genes such as Lr34, Lr46, and Sr57 provide broad-spectrum and long-lasting defense by modulating systemic resistance pathways. These genes trigger mechanisms like enhanced signaling cascades and antimicrobial compound synthesis. Genetic introgression from wild relatives, such as Triticum turgidum and Aegilops spp., enriches the wheat gene pool with novel resistance alleles. Cutting-edge methodologies, including marker-assisted selection (MAS), genomic selection, and pathogen monitoring, accelerate the incorporation of resistance genes while mitigating risks posed by pathogen adaptation. Through the strategic integration of genetic resistance and molecular precision, this multidimensional approach forms the basis for the creation of durable resistant varieties. These varieties ensure agronomic sustainability and enhance crop defense against biotic stresses, accounting for the complexities of evolving agro-ecological and climatic dynamics.