Abstract
Main conclusion
Short-term cold stress can induce the increased expression of key enzyme-encoding genes involved in secondary metabolite synthesis, thereby increasing secondary metabolite concentration.
Abstract
Cold stress is an ecologically limiting factor that strongly affects the physiological and biochemical properties of medicinal plants often resulting in changes of the secondary metabolic process. Ginsenosides are the main active ingredients in medicinal ginseng yet few studies exist on the effect of cold stress on the expression of ginsenosides or the molecular mechanism underlying its regulation. Here, we evaluated the effects of cold stress on the physiological characteristics and secondary metabolism of P. ginseng embryogenic calli. Physiological measurements and RNA-Seq analysis were used to dissect the metabolic and molecular responses of P. ginseng to cold conditions. We found that the dynamic accumulation of ginsenoside and various physiological indicators leads to homogenous adaptation to cold stress. Secondary metabolism of ginseng could be a compensation mechanism to facilitate its adaptation to cold stress. Combined with the changes in the endogenous hormone content, 9-cis-epoxycarotenoid dioxygenase (NCED), zeaxanthin epoxidase (ZEP), and short chain dehydrogenase (SDR) from the abscisic acid (ABA) synthesis pathway were identified as key mediators of this response. Thus, an appropriate degree of cold stress may promote accumulation of ginsenosides. Moreover, 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR2), squalene epoxidase (SE1), squalene synthase (SS), dammarenediol synthase (DS-II), and β-alanine C-28 hydroxylase (CYP716A52v2) should be considered key mediators of the cold stress response and ginsenoside biosynthesis. During industrial production, short-term cold stress should be carried out on ginseng calli to improve the quality of its medicinal materials.
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Abbreviations
- CAT:
-
Catalase
- CYP716A52v2 :
-
β-Alanine C-28 hydroxylase
- DS :
-
Dammarenediol synthase
- HMGR :
-
3-Hydroxy-3-methylglutaryl-CoA reductase
- JA:
-
Jasmonic acid
- MDA:
-
Malondialdehyde
- NCED:
-
9-Cis-epoxycarotenoid dioxygenase
- POD:
-
Peroxidase
- SA:
-
Salicylic acid
- SDR:
-
Short chain dehydrogenase
- SE :
-
Squalene epoxidase
- SS1 :
-
Squalene synthase
- SOD:
-
Superoxide dismutase
- SP:
-
Soluble protein
- SS:
-
Soluble sugars
- ZEP:
-
Zeaxanthin epoxidase
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Acknowledgements
This work was supported by the major science and technology projects of the Jilin Province (20200504002YY), the National Key Research and Development Programs of China (2019YFC1710700), and the Chinese Agricultural Research System (grant number CARS-21).
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MH and LY conceived and designed the research. TZ performed the experiments and prepared the manuscript; YG completed the experimental data processing; all authors read and approved the manuscript.
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425_2020_3535_MOESM5_ESM.png
Supplementary file5 (PNG 175 KB) Fig. S5 Analysis of T_6 vs C_6 differentially expressed gene KEGG enrichment. Fig. S6 Validation of the transcriptome data using qRT-PCR. Vertical bars indicate the mean value ± SD from three independent experiments. *P < 0.05 and **P < 0.01 denote significant differences from the control, respectively.
425_2020_3535_MOESM6_ESM.xlsx
Supplementary file6 (XLSX 10 KB) Table S1 FPKM results of ten randomly selected P. ginseng calli unigenes identified during high-throughput transcriptome sequencing
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Zhang, T., Gao, Y., Han, M. et al. Changes in the physiological characteristics of Panax ginseng embryogenic calli and molecular mechanism of ginsenoside biosynthesis under cold stress. Planta 253, 79 (2021). https://doi.org/10.1007/s00425-020-03535-7
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DOI: https://doi.org/10.1007/s00425-020-03535-7