Exogenous melatonin alleviates cadmium uptake and toxicity in apple rootstocks

He, Jun; Zhuang, Xiaolei; Zhou, Jiangtao; Sun, Luyang; Wan, Huixue; Li, Huifeng; Lyu, Deguo

doi:10.1093/treephys/tpaa024

Cited by 56 publications

(25 citation statements)

References 64 publications

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“…Melatonin affects biological processes not only by improving antioxidant defense systems but also by facilitating the exclusion or sequestration of heavy metals in plant cells (Hasan et al, 2015(Hasan et al, , 2019Nawaz et al, 2018;Cao et al, 2019;Sun et al, 2020). Melatonin decreases cadmium accumulation in Arabidopsis by modulating the expression of several heavy metal transporter genes, including ABC transporter genes and PCR2 (Gu et al, 2017;He et al, 2020). Taken together, these findings suggest that melatonin plays important roles in plant adaptation to heavy metal stress, functioning in a variety of ways to orchestrate this process.…”

Section: Melatonin Levels and Biosynthesis In Plants Under Stress Conmentioning

confidence: 91%

“…The authors proposed that strigolactones act upstream of melatonin to delay flowering due to the activation of FLC when the melatonin content in tissues exceeds a certain threshold. Interestingly, NO, whose production is induced by melatonin, increases DELLA protein levels (Lozano‐Juste and León, 2011) and represses the floral transition in Arabidopsis (He et al, 2004). Shi and co‐workers (2016b), who first reported a direct link between melatonin and the floral transition, suggested that NO might be involved in melatonin‐mediated stabilization of DELLA proteins, leading to a clear delay in flowering.…”

Section: Melatonin As a Master Plant (Hormone) Regulatormentioning

confidence: 99%

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Melatonin: A master regulator of plant development and stress responses

Sun

Liu

Wang

et al. 2020

JIPB

259

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Melatonin is a pleiotropic molecule with multiple functions in plants. Since the discovery of melatonin in plants, numerous studies have provided insight into the biosynthesis, catabolism, and physiological and biochemical functions of this important molecule. Here, we describe the biosynthesis of melatonin from tryptophan, as well as its various degradation pathways in plants. The identification of a putative melatonin receptor in plants has led to the hypothesis that melatonin is a hormone involved in regulating plant growth, aerial organ development, root morphology, and the floral transition. The universal antioxidant activity of melatonin and its role in preserving chlorophyll might explain its anti‐senescence capacity in aging leaves. An impressive amount of research has focused on the role of melatonin in modulating postharvest fruit ripening by regulating the expression of ethylene‐related genes. Recent evidence also indicated that melatonin functions in the plant's response to biotic stress, cooperating with other phytohormones and well‐known molecules such as reactive oxygen species and nitric oxide. Finally, great progress has been made towards understanding how melatonin alleviates the effects of various abiotic stresses, including salt, drought, extreme temperature, and heavy metal stress. Given its diverse roles, we propose that melatonin is a master regulator in plants.

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Section: Melatonin Levels and Biosynthesis In Plants Under Stress Conmentioning

confidence: 91%

Section: Melatonin As a Master Plant (Hormone) Regulatormentioning

confidence: 99%

Melatonin: A master regulator of plant development and stress responses

Sun

Liu

Wang

et al. 2020

JIPB

259

203

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“…It was expected that scion/rootstock interactions affected the transcription of the genes involved in Cd uptake, translocation, and detoxification. Plasma membrane-bound H + -ATPases, Fe(III) reductase, and NRAMPs regulate the uptake of divalent cations such as Cd 2+ in plants ( Zhou et al., 2016 ; Ding et al., 2017 ; He et al., 2020 ). HA7 and FRO2-like encode PM-bound H + -ATPase and Fe(III) reductase, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Our previous study found that the mRNA levels of ABCC1 and NAS1 catalyzing NA synthesis were higher in M. baccata than in M. micromalus “qingzhoulinqin”. Hence, the former had relatively greater Cd tolerance ( He et al., 2020 ). The ABCC1 , CAX4 , and MT2 transcript levels were substantially higher in Cd-treated HF/Mb than they were in Cd-challenged HF/Mm which led to comparatively higher Cd tolerance in the former.…”

Section: Discussionmentioning

confidence: 99%

“…Plasma membrane (PM) H + -ATPases furnish the proton motive force for ion transmembrane transport (Ma et al, 2014). HA7, HA2.1, and AHA10.1 encode various H + -ATPases that play important roles in Cd uptake (He et al, 2015;He et al, 2020). FRO2-like encoding Fe(III) reductase proteins and natural resistance-associated macrophage protein 1 (NRAMP1) are located in the PM and control Cd penetration into root cell cytosols (Gao et al, 2011;Lin and Aarts, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Rootstock–Scion Interaction Affects Cadmium Accumulation and Tolerance of Malus

Zhou

Wan

et al. 2020

Front. Plant Sci.

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To understand the roles of Malus rootstock, scion, and their interaction in Cd accumulation and tolerance, four scion/rootstock combinations consisting of the apple cultivars "Hanfu" (HF) and "Fuji" (FJ) grafted onto M. baccata (Mb) or M. micromalus "qingzhoulinqin" (Mm) rootstocks differing in relative Cd tolerance were exposed either to 0 µM or 50 µM CdCl 2 for 18 d. Cd accumulation and tolerance in grafted Malus plants varied within rootstock, scion, and rootstock-scion interaction. Cd-induced decreases in photosynthesis, photosynthetic pigment level, and biomass were lower for HF grafted onto Mb than those for HF grafted onto Mm. Reductions in growth and photosynthetic rate were always the lowest for HF/Mb. Cd concentration, bioconcentration factor (BCF), and translocation factor (T f) were always comparatively higher in HF and FJ grafted onto rootstock Mm than in HF and FJ grafted on Mb, respectively. When HF and FJ were grafted onto the same rootstock, the root Cd concentrations were always higher in HF than FJ, whereas the shoot Cd concentrations displayed the opposite trend. The shoot Cd concentrations and T f were lower for HF/Mb than the other scion/rootstock combinations. Rootstock, scion, and rootstock-scion interaction also affected subcellular Cd distribution. Immobilization of Cd in the root cell walls may be a primary Cd mobility and toxicity reduction strategy in Malus. The rootstock and scion also had statistically significant influences on ROS level and antioxidant activity. Cd induced more severe oxidative stress in HF and FJ grafted onto Mm than it did in HF and FJ grafted onto Mb. Compared with FJ, HF had lower foliar O 2-, root H 2 O 2 , and root and leaf MDA levels, but higher ROS-scavenging capacity. The rootstock, scion, and rootstock-scion interaction affected the mRNA transcript levels of several genes involved in Cd uptake, transport, and detoxification including HA7, FRO2-like, NRAMP1, NRAMP3, HMA4, MT2, NAS1, and ABCC1. Hence, the responses of grafted Malus plants to Cd toxicity vary with rootstock, scion, and rootstock-scion interaction.

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Effects of exogenous melatonin on the growth and cadmium accumulation of lettuce under cadmium‐stress conditions

Tang

Li³

et al. 2022

Env Prog and Sustain Energy

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Melatonin (MT) is a signaling molecule that is widely present in plants and can help them resist abiotic stresses. In this study, the effects of different concentrations of exogenous MT on the growth and development of lettuce (Lactuca sativa) under cadmium stress (50 μmol/L) were investigated. Based on their Cd accumulation differences, the "Hong Feng" and "Luo Ma" lettuce cultivars were selected as research materials. The results showed that different concentrations of MT could promote the growth of lettuce under 50 μmol/L cadmium stress. The application of exogenous melatonin can significantly increase the plant height, biomass, chlorophyll, soluble protein and soluble sugar content of lettuce, and increase the net photosynthetic rate. MT could also reduce the malondialdehyde content in lettuce under cadmium stress and increase the activities of superoxide dismutase, peroxidase, and catalase activities. After treatment with different concentrations of MT, the Cd content in the shoots of both cultivars significantly decreased; in contrast, the Cd content in the roots was significantly increased, which limited the transport of Cd from underground to the shoots. In addition, both Cd stress and exogenous MT induced the synthesis of endogenous MT, and 50 μmol/L MT treatment most effectively induced this response. In conclusion, this study demonstrated that MT could alleviate the negative effects of Cd stress on lettuce with different Cd accumulation differences in terms of physiological indicators. Therefore, it provides a certain reference for the potential of MT to be applied to crops threatened by heavy metals.

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Exogenous melatonin alleviates cadmium uptake and toxicity in apple rootstocks

Cited by 56 publications

References 64 publications

Melatonin: A master regulator of plant development and stress responses

Melatonin: A master regulator of plant development and stress responses

Rootstock–Scion Interaction Affects Cadmium Accumulation and Tolerance of Malus

Effects of exogenous melatonin on the growth and cadmium accumulation of lettuce under cadmium‐stress conditions

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