| Summary: | Cell cycle proteins and cyclin-dependent kinases (CDKs) play a vital role in the control of cell division, and their complexes form a powerful driving force in pushing cell cycle progression. <i>D-type cyclins</i> (<i>CycD</i>s) are essential for interpreting outside mitogenic signals and regulating the G1 phase. At least 19 distinct <i>CycD</i>s are present in the Moso bamboo (<i>Phyllostachys edulis</i>) genome, belonging to subgroups identified previously in other plants. Silico analysis validated the representative distinctive cyclin domains of each <i>CycD</i> in Moso bamboo, revealing that the genomic architectures of these genes were identical to those of their orthologs in <i>Arabidopsis</i> and rice. Both the phylogeny and covariance suggested that <i>PheCycD</i>s were structurally conserved and had undergone gene duplication. Transcriptome data analysis related to different tissues revealed that most <i>CycD</i>s were highly expressed in Moso bamboo shoots. The addition of growth hormone (NAA) significantly increased the transcript levels of <i>PheCycD4;4</i>, <i>D5;1</i>, <i>D5;2</i>, and <i>D6;1</i> for a short period of time (6 h), and inhibitors (PCIB) also greatly decreased their expression. These results improved the understanding of <i>PheCycD</i>s in our study, notably in relation to auxin response, and offered an initial insight into the expression pattern and functional mining of the <i>PheCycD</i> gene family.
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