Abstract
Dendrobium officinale, a herb with highly medicinal and ornamental value, is widely distributed in China. MADS-box genes encode transcription factors that regulate various growth and developmental processes in plants, particular in flowering. However, the MADS-box genes in D. officinale are largely unknown. In our study, expression profiling analyses of selected MADS-box genes in D. officinale were performed. In total, 16 DnMADS-box genes with full-length ORF were identified and named according to their phylogenetic relationships with model plants. The transient expression of eight selected MADS-box genes in the epidermal cells of tobacco leaves showed that these DnMADS-box proteins localized to the nucleus. Tissue-specific expression analysis pointed out eight flower-specific expressed MADS-box genes in D. officinale. Furthermore, expression patterns of DnMADS-box genes were investigated during the floral transition process. DnMADS3, DnMADS8 and DnMADS22 were significantly up-regulated in the reproductive phase compared with the vegetative phase, suggesting putative roles of these DnMADS-box genes in flowering. Our data showed that the expressions of MADS-box genes in D. officinale were controlled by diverse exogenous phytohormones. Together, these findings will facilitate further studies of MADS-box genes in Orchids and broaden our understanding of the genetics of flowering.
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Acknowledgements
This study was supported by the Natural Science Foundation of China (31801891), the Tree Breeding Project of Zhejiang Province, China (2016C02065), the Natural Science Foundation of Zhejiang Province, China (LQ17C150002), and the Open Research Subject of Key Laboratory of Plant Germplasm Enhancement of Specially Forestry of Central and South of Zhejiang Province (ZX201902).
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Conceived and designed the experiments: YC and QS; Performed the experiments: YC, PL, RL; Analyzed the data: RL; Drafted the manuscript: YC and CBS.
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Chen, Y., Shen, Q., Lyu, P. et al. Identification and expression profiling of selected MADS-box family genes in Dendrobium officinale. Genetica 147, 303–313 (2019). https://doi.org/10.1007/s10709-019-00071-5
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DOI: https://doi.org/10.1007/s10709-019-00071-5