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The deacetylation of core histones controlled by the action of histone deacetylases (HDACs) plays an important role in the epigenetic regulation of plant gene transcription. However, no systematic analysis of  HDAC  genes in  Dendrobium officinale , a medicinal orchid, has been performed. In the current study, a total of 14 histone deacetylases in  D. officinale  were identified and characterized using bioinformatics-based methods. These genes were classified into RPD3/HDA1, SIR2, and HD2 subfamilies. Most  DoHDAC  genes in the same subfamily shared similar structures, and their encoded proteins contained similar motifs, suggesting that the  HDAC  family members are highly conserved and might have similar functions. Different  cis -acting elements in promoters were related to abiotic stresses and exogenous plant hormones. A transient expression assay in onion epidermal cells by  Agrobacterium -mediated transformation indicated that all of the detected histone deacetylases such as DoHDA7, DoHDA9, DoHDA10, DoHDT3, DoHDT4, DoSRT1 and DoSRT2, were localized in the nucleus. A tissue-specific analysis based on RNA-seq suggested that  DoHDAC  genes play a role in growth and development in  D. officinale . The expression profiles of selected  DoHDAC  genes under abiotic stresses and plant hormone treatments were analyzed by qRT-PCR.  DoHDA3 ,  DoHDA8 ,  DoHDA10  and  DoHDT4  were modulated by multiple abiotic stresses and phytohormones, indicating that these genes were involved in abiotic stress response and phytohormone signaling pathways. These results provide valuable information for molecular studies to further elucidate the function of  DoHDAC  genes.

peerj

Identification of histone deacetylase genes in <i>Dendrobium officinale</i> and their expression profiles under phytohormone and abiotic stress treatments

Identification of histone deacetylase genes in Dendrobium officinale and their expression profiles under phytohormone and abiotic stress treatments