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The  SnRK  (Snf1-Related protein Kinase) gene family plays crucial roles in various plant signaling pathways and stress-adaptive responses including biotic and abiotic stresses via activating protein phosphorylation pathways. However, there is no information available on the role of the  SnRK  gene family in  Hedychium coronarium .  H. coronarium  is an important crop widely cultivated as an ornamental plant, herb, spice, or condiment. In this study, 60  HcSnRK  genes were identified from the  H. coronarium  genomic and transcriptome data. Phylogenetic and gene structure analysis showed that the  HcSnRK  genes were divided into three groups ( HcSnRK1 ,  HcSnRK2  and  HcSnRK3 ) and among them  HcSnRK3  subfamily was further subdivided into two clades according to the number of introns. Chromosome localization analysis showed that  HcSnRK  genes were unevenly mapped onto all chromosomes, and the  Ka/Ks  ratio of 24 paralogues includes four tandems and 20 segmental duplications indicated that the  HcSnRK  gene family underwent a purifying selection.  Cis -regulatory elements analysis suggested that the  HcSnRK  genes respond to multiple hormones and other stresses. The responsiveness of  HcSnRK  genes to several hormones was analyzed by quantitative real-time PCR. Based on the different transcriptome data, two candidates  HcSnRK  genes ( HcSnRK2.2  and  HcSnRK2.9 ) were screened out for further characterization . The subcellular localization experiment revealed that both genes were located in the nucleus and cytoplasm. Moreover, virus-induced gene silencing (VIGS) of  HcSnRK2.2  and  HcSnRK2.9  significantly reduced the floral volatile contents by suppressing the expression of terpene synthase genes ( HcTPS1, HcTPS3,  and  HcTPS5 ), indicating that  HcSnRK2.2  and  HcSnRK2.9  genes play an important role in the regulatory mechanism of floral aroma. These results will provide novel insights into the functional dissection of  H. coronarium SnRK  gene family.

peerj

Genome-wide identification and expression pattern of SnRK gene family under several hormone treatments and its role in floral scent emission in Hedychium coronarium