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Crosstalk between melatonin and nitric oxide restrains Cadmium-induced oxidative stress and enhances vinblastine biosynthesis in Catharanthus roseus (L) G Don.

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Abstract

Key message

Nitric oxide functions downstream of the melatonin in adjusting Cd-induced osmotic and oxidative stresses, upregulating the transcription of D4H and DAT genes, and increasing total alkaloid and vincristine contents.

Abstract

A few studies have investigated the relationship between melatonin (MT) and nitric oxide (NO) in regulating defensive responses. However, it is still unclear how MT and NO interact to regulate the biosynthesis of alkaloids and vincristine in leaves of Catharanthus roseus (L.) G. Don under Cd stress. Therefore, this context was explored in the present study. Results showed that Cd toxicity (200 µM) induced oxidative stress, decreased biomass, Chl a, and Chl b content, and increased the content of total alkaloid and vinblastine in the leaves. Application of both MT (100 µM) and sodium nitroprusside (200 µM SNP, as NO donor) enhanced endogenous NO content and accordingly increased metal tolerance index, the content of total alkaloid and vinblastine. It also upregulated the transcription of two respective genes (D4H and DAT) under non-stress and Cd stress conditions. Moreover, the MT and SNP treatments reduced the content of H2O2 and malondialdehyde, increased the activities of superoxide dismutase and ascorbate peroxidase, enhanced proline accumulation, and improved relative water content in leaves of Cd-exposed plants. The scavenging NO by 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxy l-3-oxide (cPTIO) averted the effects of MT on the content of total alkaloid and vinblastine and antioxidative responses. Still, the effects conferred by NO on attributes mentioned above were not significantly impaired by p–chlorophenylalanine (p-CPA as an inhibitor of MT biosynthesis). These findings and multivariate analyses indicate that MT motivated terpenoid indole alkaloid biosynthesis and mitigated Cd-induced oxidative stress in the leaves of periwinkle in a NO-dependent manner.

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Data availability

The data that support the findings of this study are available from the first author upon reasonable request.

Abbreviations

APX:

Ascorbate peroxidase

CAT:

Catalase

Cd:

Cadmium

Chl.:

Chlorophyll

cPTIO:

4-Carboxyphenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide

D-4H:

Desacetoxylvindoline-4 hydroxylase

DAT:

Deacetylvindoline acetyl CoA acetyltransferase

DW:

Dry weight

FW:

Fresh weight

HM:

Heavy metals

MAPKs:

Mitogen-activated protein kinases

MDA:

Malondialdehyde

MT:

Melatonin

MTI:

Metal tolerance index

NBT:

Nitroblue tetrazolium

NO:

Nitric oxide

NOMET:

N-Nitrosomelatonin

NOS:

Nitric oxide synthase

NR:

Nitrate reductase

nSiO2 :

Silicon dioxide nanoparticles

p-CPA:

P–chlorophenylalanine

POD:

Peroxidase

PRX1:

Peroxidase 1

PTMs:

Post-translational modifications

ROS:

Reactive oxygen species

RWC:

Relative water content

SNP:

Sodium nitroprusside

SOD:

Superoxide dismutase

STR:

Strictosidine synthase

TBA:

Thiobarbituric acid

TIA:

Terpenoid indole alkaloid

TW:

Turgor weight

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Funding

The authors would like to thank the Plant Science Department of Shahrekord University, Iran, for the financial support of this research.

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Authors

Contributions

RA conceived and designed research. MN conducted experiments. AA and MG advised and contributed to RT-PCR and statistical analysis, respectively. RA and MN analyzed data and wrote the manuscript and M.Gh. edited it. All authors read and approved the manuscript.

Corresponding author

Correspondence to Rayhaneh Amooaghaie.

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The authors declare that they have no conflict of interest.

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Not applicable. This manuscript does not involve researching about humans or animals.

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Communicated by Muthu Thiruvengadam.

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Nabaei, M., Amooaghaie, R., Ghorbanpour, M. et al. Crosstalk between melatonin and nitric oxide restrains Cadmium-induced oxidative stress and enhances vinblastine biosynthesis in Catharanthus roseus (L) G Don.. Plant Cell Rep 43, 139 (2024). https://doi.org/10.1007/s00299-024-03229-4

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  • DOI: https://doi.org/10.1007/s00299-024-03229-4

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