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Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) is a key glycolytic enzyme that plays important roles in multiple cellular processes including phytohormone signaling, plant development, and transcriptional regulation. Although  GAPDH  genes have been well characterized in various plant species such as  Arabidopsis , tobacco, wheat, rice, and watermelon, comprehensive analysis has yet to be completed at the whole genome level in sweet orange ( Citrus sinensis ). In this study, six  GAPDH  genes distributed across four chromosomes were identified within the sweet orange genome. Their gene structures, conserved subunits, and subcellular localization were also characterized. Cis-element analysis of  CsGAPDHs’  promoter regions and the results of dark treatments indicate that CsGAPDH may be involved in photosynthesis.  CsGAPDH  genes expressed either in a tissue-specific manner or constitutively were ultimately identified along with their expression response to phosphorus deficiency treatments. In addition, a dual-luciferase transient assay was performed to reveal the transcriptional activation of CsGAPDH proteins. Gene Ontology (GO) analysis for proteins interacting with CsGAPDHs helped to uncover the roles these CsGAPDHs play in other plant processes such as citrus seed germination. This study provides a systematic analysis of the  CsGAPDH  gene family in the sweet orange genome, which can serve as a strong foundation for further research into the biochemical properties and physiological functions of  CsGAPDHs .

peerj

Genome-wide identification, characterization, interaction network and expression profile of <i>GAPDH</i> gene family in sweet orange (<i>Citrus sinensis</i>)

Genome-wide identification, characterization, interaction network and expression profile of GAPDH gene family in sweet orange (Citrus sinensis)