Abstract
Prunus persica is considered one of the most hypoxia-intolerant stone fruits. However, waterlogging, which causes hypoxia, occurs frequently in southern China where peaches are commercially important. As useful waterlogging-tolerant rootstock for peaches is limited, effective emergency strategies are urgent to identify solutions for this problem. In this study, we assessed the effect of exogenous melatonin application at different concentrations on the physiological, metabolic, and molecular properties of peach seedlings during waterlogging. The results revealed that melatonin markedly enhanced the waterlogging tolerance of peach seedlings, especially using a 200-μM solution of melatonin, as evidenced by the tolerant phenotype including new leaves and root activity, as well as by the higher levels of relative chlorophyll content and stomatal aperture, compared with waterlogging-stressed plants. In addition, higher levels of superoxide dismutase (SOD, EC 1.15.1.1) and peroxidase (POD, EC 1.11.1.7) activity and lower levels of lipid peroxidation, hydrogen peroxide (H2O2), as well as ethylene content in melatonin-treated plants suggest that melatonin acts as an antioxidant in the context of waterlogging stress. Anaerobic respiration was controlled by melatonin through the enhanced aerenchyma and the suppressed regulation of metabolic enzymes (ADH: EC 1.1.1.1, PDC: EC 4.1.1.1, and LDH: EC 1.1.1.27) and the enzymatic and/or transcript level. Moreover, the expression levels of Ca2+ signalling and hypoxia-related ERF VII transcription factor genes were elevated by melatonin against waterlogging stress. Taken together, these results highlight that melatonin was an effective molecule for enhancement of hypoxia tolerance, particularly in peach plants, through the regulation of antioxidant enzymes and anaerobic respiration.
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Abbreviations
- SOD:
-
Superoxide dismutase
- POD:
-
Peroxidase
- ADH:
-
Alcohol dehydrogenase
- PDC:
-
Pyruvate decarboxylase
- LDH:
-
Lactate dehydrogenase
- MDA:
-
Malondialdehyde
- ROS:
-
Reactive oxygen species
- GABA:
-
γ-Aminobutyric acid
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Acknowledgements
This work was supported by funding from the Natural Science Foundation of Zhejiang Province (Grant No. LQ19C150003), the China Agriculture Research System (Grant No. CARS-30-Z-06), the Key Project for New Agricultural Cultivar Breeding in Zhejiang Province (Grant No. 2016C02052-5), the Key Research and Development Projects of Zhejiang Province (Grant No. 2018C02011) and the Program for Young Science Technology Talent Cultivation of Zhejiang Academy of Agricultural Sciences.
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XG and HZ designed the research as well as wrote the manuscript. XG and LX performed the experiment. LL, JX, GS and MX assisted the data analysis and manuscript writing. All authors approved the manuscript.
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Gu, X., Xue, L., Lu, L. et al. Melatonin Enhances the Waterlogging Tolerance of Prunus persica by Modulating Antioxidant Metabolism and Anaerobic Respiration. J Plant Growth Regul 40, 2178–2190 (2021). https://doi.org/10.1007/s00344-020-10263-5
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DOI: https://doi.org/10.1007/s00344-020-10263-5