Abstract
Dopamine (DA) is a kind of catecholamine that enhances plants’ ability to resist stress. However, the effects of DA treatment on the stress resistance of watermelon under continuous cropping obstacles remain unclear. The seedlings were treated at three-leaf-stage by exogenous dopamine. Then leaf-samples were collected in 0, 10, 20, 30, and 40days and examined by colorimetry to measure the activity of antioxidant enzymes and nitrogen-assimilating enzymes or the chlorophyll content. After measuring antioxidant metabolism by colorimetry, the activities of superoxide dismutase, peroxidase, catalase, ascorbate peroxidase, and polyphenol oxidase with 100 μmol L−1 dopamine treatment (DA100) in the two cultivars were over 31%, 25%, 30%, 32%, and 57% higher than those in the control (DA0), respectively. Nitrogen metabolism was measured by colorimetry. The activities of nitrate reductase, glutamine synthetase, glutamate dehydrogenase, and glutamate synthase (GOGAT) in DA100 in the two cultivars were over 38%, 34%, 28%, and 53% higher than those in the control (DA0), respectively. DA treatment improved photosynthetic efficiency and chlorophyll content. The chlorophyll content of “Qianding No. 1” in the DA100 group was 26.94% higher than that of plants in the DA0 group. In conclusion, the most suitable concentration of dopamine was 100 μmol L−1. The effects confirmed the physiological mechanism by which exogenous dopamine enhances watermelon resistance to continuous cropping stress. This study may provide insights and mechanism validation for watermelon production to resist continuous cropping obstacles.
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Acknowledgements
The authors are grateful to Prof. Fengwang Ma and Mr. Zhengwei Ma for their help in the management of the potted plants. The authors also thank the Science Research Center at College of Horticulture, NWAFU for the support of techniques used in this work.
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This work was supported by the earmarked fund for the China Agricultural Research System (CARS-24).
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Zeyu Liu and Zeyu Ji contributed equally to the work.
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Supplementary Fig. 1. Effects of exogenous dopamine on root vigor of watermelon. Data represent means ± SD. Different letters within a panel indicate significant differences among treatments (P < 0.05). The sample taken at 40d. a, ‘Qianding No.1’ (N); b, ‘Jingxin No.2’(J); DA means dopamine; the number means dopamine concentration of 0, 50, 100, 200 μmol L-1
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Liu, Z., Ji, Z., Han, Y. et al. The Mitigation Effects of Exogenous Dopamine Treatment on Continuous Cropping Obstacles in Watermelon. J Soil Sci Plant Nutr 23, 4233–4249 (2023). https://doi.org/10.1007/s42729-023-01344-x
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DOI: https://doi.org/10.1007/s42729-023-01344-x