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Exogenous Melatonin Alleviates Heat‐Induced Oxidative Damage in Strawberry (Fragaria × ananassa Duch. cv. Ventana) Plant

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Abstract

Melatonin is a signaling molecule that is involved in inducing plantsʼ abiotic stress tolerance. To determine the possible effects of the melatonin pre-treatment on thermotolerance in strawberry (Fragaria × ananassa Duch.), the heat-sensitive cultivar Ventana was subjected to high temperatures (35 °C and 40 °C) for 10 h after pre-treatment with 0, 50, and 100 μM melatonin. High temperature increased malondialdehyde and H2O2 contents and reduced relative water content, carotenoid content, and catalase and ascorbate peroxidase activities, which led to a marked reduction in chlorophyll fluorescence. However, pre-treatment with melatonin at 100 μM decreased heat injury symptoms and induced antioxidant mechanisms in heat-sensitive cultivar Ventana, increasing heat tolerance. The results showed that when the melatonin pre-treated strawberry plants were exposed to high temperature (40 °C) for 2 h, the levels of FaTHsfA2a and HSP90 mRNA significantly increased, but after heat treating at 40 °C for 5 and 10 h, their mRNA levels were as similar as the control. The results support the hypothesis that melatonin acts as an important signaling molecule during heat stress to induce protective mechanisms via up-regulating the expression of defense HSF (FaTHsfA2a, FaTHSFB1a) and HSP (HSP90) genes.

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Abbreviations

SOD:

Superoxide dismutase

CAT:

Catalase

APX:

Ascorbate peroxidase

GPX:

Guaiacol peroxidase

HSP:

Heat shock proteins

HSF:

Heat shock transcription factors

MDA:

Malondialdehyde

H2O2 :

Hydrogen peroxide

AsA:

Ascorbic acid

GSH:

Reduced glutathione

RWC:

Relative water content

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Acknowledgements

We thank M. Afazel for valuable technical helps with this experiment.

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Contributions

HM carried out the experiment and performed the data analyses and reviewed the manuscript. BB was the project supervisor, designed the research, provided all the technical support during the laboratory work, and wrote the manuscript. MG helped in the design of the experiment and reviewed the manuscript. MT helped in the design of the experiment, performed gene expression analyses, and reviewed the manuscript. SK helped in the design of the experiment and reviewed the manuscript.

Corresponding author

Correspondence to Bahram Baninasab.

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The authors have no conflict of interest to report.

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Handling Editor: Shuxin Ren.

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Manafi, H., Baninasab, B., Gholami, M. et al. Exogenous Melatonin Alleviates Heat‐Induced Oxidative Damage in Strawberry (Fragaria × ananassa Duch. cv. Ventana) Plant. J Plant Growth Regul 41, 52–64 (2022). https://doi.org/10.1007/s00344-020-10279-x

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  • DOI: https://doi.org/10.1007/s00344-020-10279-x

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