ABSTRACT
This chapter reviews recent research on genetic resistance loci and breeding strategies based on both conventional and biotechnology-based breeding approaches to achieve durable resistance to septoria tritici blotch infection and minimise grain yield losses. Deployment of genetic resistance is considered one of the most effective and environmentally safe strategies for reducing yield losses in cereal crops. To achieve durable resistance in commercial varieties, comprehensive understanding of the genetics of host resistance. Host-pathogen interaction and genetic inheritance studies have revealed two types of resistance to Z. tritici. These are: qualitative resistance; and quantitative resistance. Monogenic sources for genetic resistance are often deployed in commercial varieties, as they provide ‘complete’ resistance against pathogens. For such resistance, host-pathogen interaction response is easier to evaluate under glasshouse and field conditions based on phenotypic expression at seedling stage. Besides naturally occurring variation, novel genes conferring resistance to diseases can be deployed to enhance durability.
