Genome-Wide Identification and Characterization of Lectin Receptor-Like Kinase Gene Family in Cucumber and Expression Profiling Analysis under Different Treatments

Lectin receptor-like kinases (LecRLKs) are a class of membrane proteins found in plants that are involved in diverse functions, including plant development and stress responses. AlthoughLecRLKfamilies have been identified in a variety of plants, a comprehensive analysis has not yet been undertaken in cucumber (Cucumis sativusL.). In this study, 46 putativeLecRLKgenes were identified in the cucumber genome, including 23 G-type and 22 L-type, and one C-typeLecRLKgene. They were unequally distributed on all seven chromosomes, with a clustering tendency. Most of the genes in the cucumberLecRLK(CsLecRLK)gene family lacked introns. In addition, there were many regulatory elements associated with phytohormones and stress on these genes' promoters. Transcriptome data demonstrated distinct expression patterns ofCsLecRLKgenes in various tissues. Furthermore, we found that each member of theCsLecRLKfamily had its own unique expression pattern under hormone and stress treatment by the quantitative real-time PCR (qRT-PCR) analysis. This study provides a better understanding of the character and function of theLecRLKgene family in cucumber and opens up the possibility to exploring the roles thatLecRLKs might play in the life cycle of cucumber.