Synergistic anti‐oomycete effect of melatonin with a biofungicide against oomycetic black shank disease

Zhang, Shumin; Liu, Sen; Zhang, Jiankui; Reíter, Russel J.; Wang, Ying; Qiu, Dong; Luo, Xiumei; Khalid, A Rehman; Wang, Hanyan; Feng, Li; Lin, Zhenghong; Ren, Maozhi

doi:10.1111/jpi.12492

Cited by 61 publications

(36 citation statements)

References 56 publications

(129 reference statements)

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“…Of particular note are the synergistic anti-fungal effects of melatonin and the fungicide Infinito (fluopicolide, Bayer ® ) on P. infestans, suggesting that melatonin could reduce the dose levels and enhance the efficacy of the fungicide against potato late blight [90]. The same synergistic action of melatonin and ethylicin (a bio-oomyceticide fungicide) has been described [98]. A similar beneficial effect of melatonin treatments was observed with other fungicides and herbicides (Table 1).…”

Section: Metals As a Severe Abiotic Stress And Effects Induced By Melsupporting

confidence: 55%

Role of Melatonin to Enhance Phytoremediation Capacity

Arnao

Hernández‐Ruíz

2019

Applied Sciences

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Phytoremediation is a green technology that aims to take up pollutants from soil or water. Metals are one of the targets of these techniques due to their high toxicity in biological systems, including plants and animals. Their elimination or, at least, decrease will help keep them from being incorporated in the trophic chain and thus reaching animal and human food. The metal removal efficiency of plants is closely related to their growth rate, tolerance, and their adaptability to different environments. Melatonin (N-acetyl-5-methoxytryptamine) is a ubiquitous molecule present in animals, plants, fungi, and bacteria. In plants, it plays an important role related to antioxidant activity, but also as an important redox network regulator. Thus, melatonin has been defined as a biostimulator of plant growth, especially under environmental stress conditions, whether abiotic (water deficit and waterlogging, extreme temperature, UV radiation, salinity, alkalinity, specific mineral deficit/excess, metals and other toxic compounds, etc.) or biotic (bacteria, fungi, and viruses). Exogenous melatonin treated plants have been seen to have a high tolerance to stressors, minimizing possible harmful effects through the control of reactive oxygen species (ROS) levels and activating antioxidative responses. Furthermore, important gene expression changes in stress specific transcription factors have been demonstrated. Melatonin is capable of mobilizing toxic metals, through phytochelatins, transporting this, while sequestration adds to the biostimulator effect of melatonin on plants, improving plant tolerance against toxic pollutants. Furthermore, melatonin improves the uptake of nitrogen (N), phosphorus (P), and sulfur (S) in stress situations, enhancing cell metabolism. In light of the above, the application of melatonin seems to be a useful option for clearing toxic pollutants from the environment by improving phytoremediation. Interestingly, a variety of stressors induce melatonin biosynthesis in plants, and the study of this endogenous response in hyperaccumulator plants may be even more interesting as a natural response of the phytoremediation of diverse plants.

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Section: Metals As a Severe Abiotic Stress And Effects Induced By Melsupporting

confidence: 55%

Role of Melatonin to Enhance Phytoremediation Capacity

Arnao

Hernández‐Ruíz

2019

Applied Sciences

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“…This pretreatment reduced the disease index by activating antioxidant enzymes and the expression of antioxidant-related genes [66]. Zhang, et al [67] demonstrated that the combined application of melatonin and ethylicin (an oomycete antifungal) has a synergistic effect that inhibits the in vitro and in vivo growth of Phytophthora nicotianae through disturbed amino acid metabolic homeostasis of this fungus. Exogenous application of melatonin in replant soil enhances apple seedling growth, raises K levels, and stimulates photosynthesis, which subsequently relieves the disorders of replant disease [68].…”

Section: Antifungal Effect Of Melatoninmentioning

confidence: 99%

“…Similar results have been obtained in fungi such as Botrytis spp., Penicillium spp., Fusarium spp., P. nicotianae, and Alternaria spp. [67][68][69]. Furthermore, several investigations have studied the role of endophytic rhizobacteria in the reinforcement ability of plants to produce melatonin [70,71].…”

Section: Antifungal Effect Of Melatoninmentioning

confidence: 99%

Melatonin and Its Protective Role against Biotic Stress Impacts on Plants

Almoneafy²,

et al. 2019

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A.A.); shaoyingai@21cn.com (S.A.); Tel.: +86-186-8050-4072 (M.M.-F.); +967-777766831 (A.A); +86-020-3288-5970 (S.A.) † These authors contributed equally to this work.Abstract: Biotic stress causes immense damage to agricultural products worldwide and raises the risk of hunger in many areas. Plants themselves tolerate biotic stresses via several pathways, including pathogen-associated molecular patterns (PAMPs), which trigger immunity and plant resistance (R) proteins. On the other hand, humans use several non-ecofriendly methods to control biotic stresses, such as chemical applications. Compared with chemical control, melatonin is an ecofriendly compound that is an economical alternative strategy which can be used to protect animals and plants from attacks via pathogens. In plants, the bactericidal capacity of melatonin was verified against Mycobacterium tuberculosis, as well as multidrug-resistant Gram-negative and -positive bacteria under in vitro conditions. Regarding plant-bacteria interaction, melatonin has presented effective antibacterial activities against phytobacterial pathogens. In plant-fungi interaction models, melatonin was found to play a key role in plant resistance to Botrytis cinerea, to increase fungicide susceptibility, and to reduce the stress tolerance of Phytophthora infestans. In plant-virus interaction models, melatonin not only efficiently eradicated apple stem grooving virus (ASGV) from apple shoots in vitro (making it useful for the production of virus-free plants) but also reduced tobacco mosaic virus (TMV) viral RNA and virus concentration in infected Nicotiana glutinosa and Solanum lycopersicum seedlings. Indeed, melatonin has unique advantages in plant growth regulation and increasing plant resistance effectiveness against different forms of biotic and abiotic stress. Although considerable work has been done regarding the role of melatonin in plant tolerance to abiotic stresses, its role in biotic stress remains unclear and requires clarification. In our review, we summarize the work that has been accomplished so far; highlight melatonin's function in plant tolerance to pathogens such as bacteria, viruses, and fungi; and determine the direction required for future studies on this topic.

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“…Phytophthora nicotianae is one of the most destructive soil-borne oomycetes pathogens in agriculture (Zhang et al, 2018;Lee et al, 2018). The fungus can infect tobacco, citrus, and other plants, causing serious economic losses (Jing et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Effects of manganese and zinc on the growth process of Phytophthora nicotianae and the possible inhibitory mechanisms

Luo

Yao

Tan

et al. 2020

PeerJ

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Background Phytophthora nicotianae is a fungal soil-borne pathogen that damages various plant species. Mancozeb and Zineb, fungicides containing manganese (Mn) and zinc (Zn) as the main components, are widely used to control the diseases caused by Phytophthora. However, the inhibition mechanism is still unclear. The purpose of this study was to examine the effects of Mn and Zn on P. nicotianae and to determine possible inhibitory mechanisms of Mn and Zn on sporangiogenesis of P. nicotianae. Methods The mycelial growth, sporangium generation, zoosporogenesis and zoospore germination of P. nicotianae were observed under Mn and Zn treatments. The gene (csn4 and csn7) expression levels of P. nicotianae in different growth stages were examined. Csn4 and csn7 gene expression, superoxide dismutase (SOD) activity, catalase (CAT) activity and malondialdehyde (MDA) content were tested at the stage of sporangiogenesis under different Mn and Zn concentrations. Results Mycelial growth of P. nicotianae was significantly inhibited by Mn from ≥1 mg/L concentration and by Zn from ≥10 mg/L. The sporangia production, sporangia release, and zoospore germination of P. nicotianae were significantly reduced by Mn at all concentrations, while treatment with Zn from ≥0.5 mg/L concentration significantly inhibited the same processes. At the same concentration, the inhibition rate of Mn on the growth process of P. nicotianae was higher than that of Zn. The csn4 and csn7 gene transcription of P. nicotianae were significantly reduced by all treatments with Mn and Zn at the stage of sporangiogenesis. With the increase of Mn concentration, the activities of SOD and CAT increased to maxima and then decreased, and the content of MDA gradually increased during sporangiogenesis of P. nicotianae. The sporangia production of P. nicotianae was significantly positively correlated with the expression levels of the genes csn4 and csn7. Conclusion The inhibitory effect of Mn on the growth process of P. nicotianae was stronger than that of Zn, especially on sporangiogenesis and zoosporogenesis. A possible mechanism of the inhibitory effect on sporangiogenesis of P. nicotianae was that Mn and Zn acted by inhibiting the expression levels of the genes csn4 and csn7 and by affecting antioxidant enzyme activity (further resulting in lipid peroxidation) in the sporangium of P. nicotianae.

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Synergistic anti‐oomycete effect of melatonin with a biofungicide against oomycetic black shank disease

Cited by 61 publications

References 56 publications

Role of Melatonin to Enhance Phytoremediation Capacity

Role of Melatonin to Enhance Phytoremediation Capacity

Melatonin and Its Protective Role against Biotic Stress Impacts on Plants

Effects of manganese and zinc on the growth process of Phytophthora nicotianae and the possible inhibitory mechanisms

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