ArticlePlant cell reports2026
Exogenous melatonin enhances the tolerance of ground-cover Chrysanthemum morifolium Ramat. to cadmium by improving photosynthetic capacity and reactive oxygen species scavenging.
Article in Plant cell reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
key messageMT mitigates Cd toxicity by enhancing photosystem and antioxidant system activities, and related gene expression in GCC. NAC, HSF, and MYB-related families may play key roles in MT-induced Cd tolerance. Cadmium (Cd), a toxic heavy metal non-essential to plants, has detrimental impacts on both the environment and human health. Melatonin (MT) plays an important protective role in plants against stresses such as heavy metal toxicity. However, the detailed mechanism underlying MT alleviating Cd toxicity remains unclear in ground-cover chrysanthemum (Chrysanthemum morifolium Ramat., GCC). GCC seedlings were pre-treated with MT solution (150 μM) via foliar spraying and subsequently grown under Cd stress, after which the growth, physiological, and transcriptomic responses of the plant were investigated. The results demonstrated that MT pre-treatment inhibited the Cd-induced chlorophyll degradation in GCC seedlings, while it enhanced chlorophyll synthesis and related gene expression by promoting electron transfer efficiency and maintaining the integrity of the oxygen-evolving complex in photosynthesis. Furthermore, MT + Cd treatment upregulated 11 photosystem I (PSI), 13 PSII, eight light-harvesting complex I (LHCI), and 20 LHCII-related genes as compared with Cd treatment alone. MT also alleviated oxidative stress and boosted antioxidant capacity by conserving the activities and gene expression levels of superoxide dismutase, peroxidase, and key enzymes in the ascorbate-glutathione cycle and thioredoxin-peroxiredoxin pathway. In addition, MT reduced the generation rate of O
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