Genome-Wide Identification and Analysis of the Plant Cysteine Oxidase (PCO) Gene Family in and Its Role in Abiotic Stress Response.

Plant Cysteine Oxidase (PCO) is a plant O-sensing enzyme catalyzing the oxidation of cysteine to Cys-sulfinic acid at the N-termini of target proteins. To better understand the gene family, genes in and related species were analyzed. In this study, 20, 7 and 8 genes were identified in , and , respectively. According to phylogenetic analysis, the were divided into five groups: , , , and . Gene organization and motif distribution analysis suggested that the gene family was relatively conserved during evolution. According to the public expression data, genes were expressed in different tissues at different developmental stages. Moreover, qRT-PCR data showed that most of the members were expressed in leaves, roots, flowers and siliques, suggesting an important role in both vegetative and reproductive development. Expression of was induced by various abiotic stress, especially waterlogging stress, which was consistent with the result of cis-element analysis. In this study, the gene family of was analyzed for the first time, which contributes to a comprehensive understanding of the origin and evolution of genes in and the function of in abiotic stress responses.