Affiliation:
1. National Key Laboratory for Tropical Crop Breeding Institute of Tropical Bioscience and Biotechnology, Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences Sanya Hainan 572024 China
2. Key Laboratory of Sugarcane Biology and Genetic Breeding, Ministry of Agriculture and Rural Affairs, National Engineering Research Center for Sugarcane College of Agriculture, Fujian Agriculture and Forestry University Fuzhou Fujian 350002 China
Abstract
SUMMARY12‐Oxo‐phytodienoic acid reductases (OPRs) perform vital functions in plants. However, few studies have been reported in sugarcane (Saccharum spp.), and it is of great significance to systematically investigates it in sugarcane. Here, 61 ShOPRs, 32 SsOPRs, and 36 SoOPRs were identified from R570 (Saccharum spp. hybrid cultivar R570), AP85‐441 (Saccharum spontaneum), and LA‐purple (Saccharum officinarum), respectively. These OPRs were phylogenetically classified into four groups, with close genes similar structures. During evolution, OPR gene family was mainly expanded via whole‐genome duplications/segmental events and predominantly underwent purifying selection, while sugarcane OPR genes may function differently in response to various stresses. Further, ScOPR2, a tissue‐specific OPR, which was localized in cytoplasm and cell membrane and actively response to salicylic acid (SA), methyl jasmonate, and smut pathogen (Sporisorium scitamineum) stresses, was cloned from sugarcane. In addition, both its transient overexpression and stable overexpression enhanced the resistance of transgenic plants to pathogen infection, most probably through activating pathogen‐associated molecular pattern/pattern‐recognition receptor‐triggered immunity, producing reactive oxygen species, and initiating mitogen‐activated protein kinase cascade. Subsequently, the transmission of SA and hypersensitive reaction were triggered, which stimulated the transcription of defense‐related genes. These findings provide insights into the function of ScOPR2 gene for disease resistance.
Funder
Natural Science Foundation of Fujian Province
National Key Research and Development Program of China