Septoria tritici blotch (STB) is an important foliar disease of wheat that is caused by the fungal pathogen . The grass has been used previously as a model system for cereal-pathogen interactions. In this study, we examined the nonhost resistance (NHR) response of to two different isolates in comparison with wheat. These isolates vary in aggressiveness on wheat cultivar Remus, displaying significant differences in disease and pycnidia coverage. Using microscopy, we found that similar isolate-specific responses were observed for hydrogen peroxide accumulation and cell death in both wheat and . Despite this, induction of isolate-specific patterns of defense gene expression by did differ between and wheat. Our results suggest that expression of the phenylalanine ammonia lyase gene may be important for NHR in , while pathogenesis-related genes and expression of genes regulating reactive oxygen species may be important to limit disease in wheat. Future studies of the - interaction may allow identification of conserved plant immunity targets that are responsible for the isolate-specific responses observed in both plant species.
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