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Integrative transcriptomic and metabolomic analyses provide insight into the long-term submergence response mechanisms of young Salix variegata stems

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Abstract

Main conclusion

The mechanisms underlying long-term complete submergence tolerance in S. variegata involve enhanced oxidative stress responses, strengthened ethylene and ABA signaling, synthesis of raffinose family oligosaccharides, unsaturated fatty acids, and specific stress-related amino acids.

Abstract

Salix variegata Franch. is a riparian shrub species that can tolerate long-term complete submergence; however, the molecular mechanisms underlying this trait remain to be elucidated. In this study, we subjected S. variegata plants to complete submergence for 60 d and collected stems to perform transcriptomic and metabolomic analyses, as well as quantitative reverse transcription-polymerase chain reaction (qRT-PCR) assays. Results revealed that photosynthesis and the response to light stimulus were inhibited during submergence and recovered after desubmergence. Ethylene and abscisic acid (ABA) signaling could be important for the long-term submergence tolerance of S. variegata. Jasmonic acid (JA) signaling also participated in the response to submergence. Raffinose family oligosaccharides, highly unsaturated fatty acids, and specific stress-related amino acids accumulated in response to submergence, indicating that they may protect plants from submergence damage, as they do in response to other abiotic stressors. Several organic acids were produced in S. variegata plants after submergence, which may facilitate coping with the toxicity induced by submergence. After long-term submergence, cell wall reorganization and phenylpropanoid metabolic processes (the synthesis of specific phenolics and flavonoids) were activated, which may contribute to long-term S. variegata submergence tolerance; however, the detailed mechanisms require further investigation. Several transcription factors (TFs), such as MYB, continuously responded to submergence, indicating that they may play important roles in the responses and adaption to submergence. Genes related to oxidative stress tolerance were specifically expressed after desubmergence, potentially contributing to recovery of S. variegata plants within a short period of time.

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Abbreviations

DEGs:

Differentially expressed genes

ERF:

Ethylene response factor

JA:

Jasmonic acid

TGRR:

Three Gorges Reservoir region

TF:

Transcription factor

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Acknowledgements

We thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of this manuscript. This research was supported by the Fundamental Research Funds for the Central Universities of China (Grant No. SWU118120), National Natural Science Foundation of China (31901283, 31870657 and 31800505), National Key Project for Research on Transgenic Plant (2016ZX08010-003), Natural Science Foundation Project of CQ CSTC (cstc2018jcyjAX0477), and Fundamental Research Funds for the Central Universities (XDJK2018AA005, XDJK2014a005).

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Correspondence to Qingwei Zhang or Keming Luo.

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Supplementary Information

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425_2021_3604_MOESM1_ESM.xlsx

Supplementary Table S1 Statistical data of the transcriptomic analysis. Table S2 Statistical data of the transcripts mapped to the Salix genome. Table S3 Mapped transcript events in the Salix genome. Table S4 Number of transcripts that encoded proteins. Table S5 The number of DEGs at 0, 5, 10, 20, 40, and 60 d after submergence and 10 d after desubmergence. All groups were compared with the control (samples collected before the onset of submergence). Table S6 List of primer sequences used in the qRT-PCR assays. Table S7 Expression patterns of the homologous genes within the 49 core hypoxia-response genes. Table S8 List of upregulated transcription factor genes that were continuously expressed during submergence. Table S9 Detailed information regarding the genes presented in Figs. 8–12 and S2. (XLSX 34 KB)

425_2021_3604_MOESM2_ESM.xls

Supplementary Table S10 Gene expression profiles that changed 5 d after submergence compared to the control. Table S11 Gene expression profiles that changed 10 d after submergence compared to the control. Table S12 Gene expression profiles that changed 20 d after submergence compared to the control. Table S13 Gene expression profiles that changed 40 d after submergence compared to the control. Table S14 Gene expression profiles that changed 60 d after submergence compared to the control. Table S15 Gene expression profiles that changed 10 d after desubmergence compared to the control. Table S16 Gene expression profiles that changed after 60 d of normal growth compared to the control. Table S17 Gene expression profiles that changed 40 d after submergence compared to 60 d of normal growth. Table S18 Gene expression profiles that changed 60 d after submergence compared to 60 d of normal growth (XLS 86861 KB)

425_2021_3604_MOESM3_ESM.tif

Supplementary Fig. S1 The air temperature, water temperature, and water oxygen concentration data recorded during the experiment (TIF 152 KB)

425_2021_3604_MOESM4_ESM.tif

Supplementary Fig. S2 Gene expression profiles related to phenylpropanoid metabolic processes during submergence and after desubmergence. Note: C0 indicates the onset of submergence; S5, S10, S20, S40, and S60 indicate 5, 10, 20, 40, and 60 d after submergence, respectively; R10 indicates 10 d after desubmergence (TIF 126 KB)

425_2021_3604_MOESM5_ESM.tif

Supplementary Fig. S3 Results of the qRT-PCR assays of selected genes during submergence and the correlation analysis comparing the qRT-PCR and transcriptomic analysis results. Ubiquitin was used as the reference gene. All gene expression levels were normalized based on the reference gene’s expression levels. Note: C0 indicates the onset of submergence; S5, S10, S20, S40, and S60 indicate 5, 10, 20, 40, and 60 d after submergence, respectively; R10 indicates 10 d after desubmergence. The scatter plot was constructed using log2(qRT-PCR) as the independent variable and log2(FPKM) as the dependent variable (TIF 642 KB)

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Zhang, Q., Tang, S., Li, J. et al. Integrative transcriptomic and metabolomic analyses provide insight into the long-term submergence response mechanisms of young Salix variegata stems. Planta 253, 88 (2021). https://doi.org/10.1007/s00425-021-03604-5

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