Genome wide analysis for the identification and characterization of Superoxide-dismutase gene family in Rosa chinensis ascertains the role of salinity-responsive RcMSD1 protein and its interaction with peroxyl radical

Abiotic stresses e.g., cold, heat, and salinity affect the quality and yield of Rosa chinensis, a well-known ornamental and medicinal plant. Previously, several attempts have been made to identify the genes that confer resistance to oxidative stressors. Superoxide-dismutase (SOD) is a crucial member of the class metalloenzyme that responds to abiotic stresses and protects plants by countering the reactive-oxygen species (ROS). In this genome-wide association study, the SOD gene family has been investigated in R. chinensis. Seven SOD genes, including three Cu/ZnSODs, two MnSODs, and two FeSODs were identified. Phylogenetic analysis revealed that RcSODs are divided into three clades; (i) CSDs (Cu/ZnSODs) (ii) FSDs (FeSODs) and MSDs (MnSODs). Most of the RcSODs exhibited different exons/introns distribution patterns. Motifs 3 and 5 are conserved in all RcSODs genes. The RNA-seq data analysis and qRT-PCR-based expression profiling indicated that RcSODs exhibit diverse responses under salt stress conditions. The RcCSD1, RcCSD3, and RcFSD3 are significantly up-regulated under salt stress conditions in roots and down-regulated in leaves. This data provides valuable information for further application and function of SODs in R. chinensis under abiotic stresses.

Automated summary

This study identified seven SOD genes in R. chinensis and found that they play a crucial role in protecting plants against oxidative stress under abiotic conditions. The expression patterns of these genes varied and they were significantly involved in salt stress responses. These findings provide valuable insights into the application and function of SODs in R. chinensis under abiotic stresses.