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Overexpression of Ginkgo biloba Hydroxy-2-methyl-2-(E)-butenyl 4-diphosphate reductase 2 gene (GbHDR2) in Nicotiana tabacum cv. Xanthi

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Abstract

2-C-Methyl-d-erythrol-4-phosphate (MEP) pathway in plant supplies isoprene building blocks for carotenoids and chlorophylls essential in photosynthesis as well as plant hormones such as gibberellin and abscisic acid. To assess the effect of overexpression of the terminal enzyme of the MEP pathway, 1-hydroxy-2-methyl-2-(E)-butenyl-4-diphosphate reductase (HDR), transgenic Nicotiana tabacum overexpressing class 2 HDR from Ginkgo biloba (GbHDR2) under the control of 35S promoter was constructed. Contents of chlorophylls a and b in transgenic tobacco were enhanced by 19 and 7%, respectively, compared to those of the wild type. The carotenoid level was also 18% higher than that in the control plant. As a result, photosynthetic rate of the transgenic tobacco was increased by up to 51%. Diterepenoid duvatrienediol content of transgenic tobacco was also elevated by at least sixfold. To explore the molecular basis of the enhanced isoprenoid accumulation, transcript levels of the key genes involved in the isoprenoid biosynthesis were measured. Transcript levels of geranylgeranyl diphosphate synthase (GGPP), kaurene synthase (KS), gibberellic acid 20 oxidase (GA20ox), and phytoene desaturase (PD) genes in the transgenic tobacco leaves were about twofold higher compared to the wild type. Therefore, upregulation of down-stream genes involved in biosynthesis of di- and tetraterpenoids due to GbHDR2 overexpression was responsible for elevated production of isoprenoids and enhanced photosynthetic rate.

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Abbreviations

ABA:

Abscisic acid

CMK,4:

(Cytidine 5′-diphospho)-2-C-methyl-d-erythritol kinase

DMAPP:

Dimethylallyl diphosphate

DVT:

Duvatrienediol

DXS:

1-Deoxyxylulose 5-phosphate synthase

G3P:

Glyceraldehydes 3-phosphate

GA:

Gibberellic acid

GA20ox:

Gibberellic acid 20 oxidase

GbHDR2:

Ginkgo biloba Class 2 1-hydroxy-2 methyl-2-(E)-butenyl 4-diphosphate reductase

GGPPS:

Geranylgeranyl diphosphate synthase

HDR:

1-Hydroxy-2-methyl-2-(E)-butenyl-4-diphosphate reductase

IPP:

Isopentenyl diphosphate

KS:

Kaurene synthase

MEP:

2-C-Methyl-d-erythritol-4-phosphate

ORF:

Open reading frame

PDS:

Phytoene desaturase

qRT-PCR:

Quantitative real-time PCR

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Acknowledgements

This work was supported by Next Generation BioGreen 21 Program administered by Rural Development Administration, Republic of Korea (Grant PJ009549032014), through Systems and Synthetic Agrobiotech Center.

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SUP and S-UK conceived the study YBK, S-MK, RS, and Y-KK performed the experiments and analyzed the data. YBK, SUP, S-UK writing—review and editing. All of the authors read and approved the final manuscript.

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Correspondence to Sang Un Park or Soo-Un Kim.

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The authors declare that they have no conflict of interest.

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This article does not contain any original research involving human participants or animals were harmed for this study by any of the authors.

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This article does not contain any original research involving human participants or animals.

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Kim, Y.B., Kim, SM., Sathasivam, R. et al. Overexpression of Ginkgo biloba Hydroxy-2-methyl-2-(E)-butenyl 4-diphosphate reductase 2 gene (GbHDR2) in Nicotiana tabacum cv. Xanthi. 3 Biotech 11, 337 (2021). https://doi.org/10.1007/s13205-021-02887-5

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  • DOI: https://doi.org/10.1007/s13205-021-02887-5

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