Abstract
Key Message
PbMYB1L enhances the cold tolerance and anthocyanin accumulation of transgenic Arabidopsis by regulating the expression of genes related to the cold-responsive genes pathway and anthocyanin synthesis pathway.
Abstract
MYB transcription factors (TFs) have been demonstrated to play diverse roles in plant growth and development. In the present study, we identified a novel R2R3-MYB transcription factor, PbMYB1L, from the peel of 'Red Zaosu' pear (Pyrus bretschneideri), which was induced by cold stress and acted as a positive regulator in anthocyanin biosynthesis. Notably, the transgenic Arabidopsis lines exhibited enhanced tolerance to cold stress. Compared to the Arabidopsis wild-type plants, the transgenic lines displayed longer primary roots and reduced reactive oxygen species (ROS) levels including O2−, hydrogen peroxide (H2O2), and malondialdehyde (MDA). Furthermore, significant upregulation of key cold-responsive genes AtCBF1, AtCBF2, AtCBF3, AtCBF4, and AtKIN1 was observed in the transgenic plants under cold stress conditions compared to wild type. Arabidopsis plants overexpressing PbMYB1L had significant anthocyanin accumulation in leaves after cold treatment with quantitative results indicating higher expression of anthocyanin structural genes compared to wild type. These findings suggest that PbMYB1L not only plays a vital role in conferring cold tolerance but also acts as a crucial regulator of anthocyanin biosynthesis.
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The data that support the findings of this study are available from the corresponding author on reasonable request.
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This work was supported by grants from the Science and Technology Plan Project of Sichuan Province (Grant No. 2021YFYZ0023-03) and the Double Support Project of Discipline Construction of Sichuan Agricultural University (03573134).
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XZ, DYL, and YZ contributed to conceptualization. XZ, HYW, and JYL conducted the experiment. XZ and WTY analyzed data. XRW did formal analysis. SYL, YTZ, and YXL were involved in methodology. YW, WH, and QC provided software. XZ, DYL, and MYL were responsible for visualizations. XZ and DYL were involved in writing – first draft. YZ and YL were involved in writing – reviews and editing. HRT performed project administration. YZ was involved in funding acquisition. All authors have read and agreed to the published version of the manuscript.
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Zhou, X., Lei, D., Yao, W. et al. A novel R2R3-MYB transcription factor PbMYB1L of Pyrus bretschneideri regulates cold tolerance and anthocyanin accumulation. Plant Cell Rep 43, 34 (2024). https://doi.org/10.1007/s00299-023-03117-3
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DOI: https://doi.org/10.1007/s00299-023-03117-3