Abstract
Key message
The mechanism of exogenous Spd-induced Ca(NO3)2 stress tolerance in cucumber was studied by proteomics and physiological analyses. Protein–protein interaction network revealed 13 key proteins involved in Spd-induced Ca(NO3)2 stress resistance.
Abstract
Ca(NO3)2 stress is one of the major reasons for secondary salinization that limits cucumber plant development in greenhouse. The conferred protective role of exogenous Spd on cucumber in response to Ca(NO3)2 stress cues involves changes at the cellular and physiological levels. To investigate the molecular foundation of exogenous Spd in Ca(NO3)2 stress tolerance, a proteomic approach was performed in our work. After a 9 days period of Ca(NO3)2 stress and/or exogenous Spd, 71 differential protein spots were confidently identified. The resulting proteins were enriched in seven different categories of biological processes, including protein metabolism, carbohydrate and energy metabolism, ROS homeostasis and stress defense, cell wall related, transcription, others and unknown. Protein metabolism (31.2%), carbohydrate and energy metabolism (15.6%), ROS homeostasis and stress defense (32.5%) were the three largest functional categories in cucumber root and most of them were significantly increased by exogenous Spd. The Spd-responsive protein interaction network revealed 13 key proteins, whose accumulation changes could be critical for Spd-induced resistance; all 13 proteins were upregulated by Spd at transcriptional and protein levels in response to Ca(NO3)2 stress. Furthermore, accumulation of antioxidant enzymes, non-enzymatic antioxidant and polyamines, along with reduction of H2O2 and MDA, were detected after exogenous Spd application during Ca(NO3)2 stress. The results of these proteomic and physiological analyses in cucumber root may facilitate a better understanding of the underlying mechanism of Ca(NO3)2 stress tolerance mediated by exogenous Spd.
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Abbreviations
- 2-DE:
-
Two-dimensional electrophoresis
- AKR4C9:
-
Aldo-keto reductase family 4 member C9-like
- APX:
-
Ascorbate peroxidase
- AsA:
-
Ascorbate
- AXS:
-
UDP-d-apiose/UDP-d-xylose synthase
- CyP:
-
Cysteine proteinase RD21a
- DapF:
-
Diaminopimelate epimerase
- EIF:
-
Eukaryotic translation initiation factor 3 subunit protein
- HSP70:
-
Heat shock 70 kDa protein
- LC–MS/MS:
-
Liquid chromatography coupled to tandem mass spectrometry
- MDA:
-
Malondialdehyde
- MDHAR:
-
Monodehydroascorbate reductase
- MG:
-
Methylglyoxal
- PAs:
-
Polyamines
- PDI:
-
Protein disulfide-isomerase-like
- POD:
-
Peroxidase
- Prx2F:
-
Peroxiredoxin-2F
- Put:
-
Putrescine
- RNAP II:
-
RNA polymerase II transcription subunit 37e-like proteins
- SAH:
-
S-adenosyl-l-homo-cys
- SAM:
-
S-adenosyl-l-met
- Spd:
-
Spermidine
- Spm:
-
Spermine
- TCA:
-
Tricarboxylic acid cycle
- TCTP:
-
Translationally-controlled tumor protein homolog
- Trx:
-
Thioredoxin
- XLA:
-
Beta-xylosidase/alpha-l-arabinofuranosidase 2-like
- CCoAMT1:
-
Caffeoyl-CoA O-methyltransferase 1
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Nos. 31471869, 31272209 and 31401919), the National Key Technology R&D Program (2013BAD20B05), the Jiangsu Province Scientific and Technological Achievements into Special Fund (BA2014147), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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JD and SG designed the research and wrote the paper. SS and JS analyzed data and helped to draft the manuscript. All authors have read and approved the final manuscript.
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Du, J., Guo, S., Sun, J. et al. Proteomic and physiological analyses reveal the role of exogenous spermidine on cucumber roots in response to Ca(NO3)2 stress. Plant Mol Biol 97, 1–21 (2018). https://doi.org/10.1007/s11103-018-0721-1
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DOI: https://doi.org/10.1007/s11103-018-0721-1