Abstract
Seed germination marks a new life cycle of a plant. Although ethylene promotes seed germination, the underlying molecular mechanism is poorly understood. Ethylene Responsive Factors (ERFs) play an essential role in ethylene signaling. Here we show that overexpression of Tomato Ethylene Responsive Factor 1 (TERF1), an ERF transcription factor isolated from tomato, can promote tobacco seed germination at 23 °C in darkness. Hormones analysis showed that salicylic acid (SA), 3-indoleacetic acid (IAA), abscisic acid (ABA) and gibberellic acids (GAs) were significantly increased by TERF1, while jasmonic acid (JA) was significantly reduced in TERF1 seeds. Transcriptome analysis identified 7,961 differentially expressed genes (DEGs), including 6,213 mRNAs, 25 miRNAs, 1,581 lncRNAs and 141 circRNAs. Gene Ontology (GO) enrichment analysis showed that cell cycles, sugar metabolism, microtubule-based processes were activated by TERF1, while DNA repair, lipid metabolism were repressed by TERF1. We also identified differentially expressed regulatory genes for ABA and GA biosynthesis or signaling in TERF1 seed, including transcription factors, kinases, phosphatases and ubiquitin protein ligases, non-coding RNAs (ncRNAs). At posttranscriptional level TERF1 also regulates gene expression through alternative splicing (AS). Protein–protein interaction (PPI) network analysis revealed three key biological processes regulated by TERF1, including nitrogen metabolism, light related processes and mitosis. Pheynotype and gene expression analysis showed that TERF1 significantly reduced seed sensitivity to ABA and auxin during germination through repressing key components of ABA signaling pathway. Our results unraveled the function of TERF1 in promoting seed germination.
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Acknowledgements
We thank Prof. Rongfeng Huang for providing the gene of TERF1 for our research. This research received the support by grants from Chinese Academy of Agricultural Sciences Basal Research Fund (No. 1610042018006).
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WW and HL designed and preformed the experiments.HL analyzed the data and wrote the manuscript. All authors read and approved the manuscript.
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The sequencing raw data has been uploaded to the Sequence Read Archive (https://www.ncbi.nlm.nih.gov/sra) under Bioproject PRJNA706111.
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Liu, H., Wu, W. Comparative transcriptome analysis reveals function of TERF1 in promoting seed germination. Physiol Mol Biol Plants 27, 1659–1674 (2021). https://doi.org/10.1007/s12298-021-01049-4
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DOI: https://doi.org/10.1007/s12298-021-01049-4