Exogenous BR Enhances Host Resistance to Through Reactive Oxygen Species Homeostasis and Photosynthesis Improvement in .

Brassinosteroid (BR) is essential in regulating plant growth and development and response to stress. However, there are few reports on the mechanism of BR regulating rice resistance to necrotrophic fungus. In this study, rice seedlings were pretreated with BR hormone and its synthetic inhibitor Brassinazole (BRZ) and inoculated with to analyze the reactive oxygen species (ROS), photosynthetic indices, and expression of phytohormones signal components and defense-related genes in rice leaves during pathogen infection.