Abstract
The MYB transcription factors comprise one of the largest superfamilies in plants that have been implicated in the regulation of plant-specific metabolites and responses to biotic and abiotic stresses. Here, we present the first comprehensive genome-wide analysis and functional characterization of the CtMYB family in Carthamus tinctorius. A total of 272 CtMYBs were identified and classified into 12 subgroups using comparative phylogenetic analysis with Arabidopsis and rice orthologs. The overview of conserved motifs, gene structures, and cis elements as well as the expression pattern of CtMYB genes indicated the diverse roles of these transcription factors during plant growth, regulation of secondary metabolites, and various abiotic stress responses. The subcellular localization and transactivation analysis of four CtMYB proteins indicated predominant localization in the nuclei with enhanced transcriptional activation in yeast. The expression of CtMYB63 induced with various abiotic stress conditions showed upregulation in its transcription level. In addition, the expression analysis of the core structural genes of anthocyanin biosynthetic pathway under drought and cold stress in CtMYB63 overexpressed transgenic lines also supports the notion of CtMYB63 transcriptional reprogramming in response to abiotic stress by upregulating the anthocyanin biosynthesis. Together, our findings revealed the underlying regulatory mechanism of CtMYB TF network involving enhanced cold and drought stress tolerance through activating the rapid biosynthesis of anthocyanin in C. tinctorius. This study also presents useful insights towards the establishment of new strategies for crop improvements.
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Data availability
The draft genome sequence of C. tinctorius available at the NCBI (https://www.ncbi.nlm.nih.gov) under accession number (PRJNA399628; submitted on august 23rd, 2017).
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Acknowledgements
This work was funded by grants from the National Natural Science Foundation of China (No. 31771868, 31501366), the Science and Technology Development Project of Jilin Province (No. 20190201172JC, 20190201175JC, 20150623024TC-11), Student innovation and entrepreneurship training program of Jilin Agricultural University.
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LX and YN designed the project; H Y and NA performed the experiments and analyze the data; JZ, and YX carried out formal analysis; XY and XT performed statistical analysis; NA conducted software analysis, HY wrote the original draft.
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Hong, Y., Ahmad, N., Zhang, J. et al. Genome-wide analysis and transcriptional reprogrammings of MYB superfamily revealed positive insights into abiotic stress responses and anthocyanin accumulation in Carthamus tinctorius L.. Mol Genet Genomics 297, 125–145 (2022). https://doi.org/10.1007/s00438-021-01839-1
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DOI: https://doi.org/10.1007/s00438-021-01839-1