Melatonin-priming enhances maize seedling drought tolerance by regulating the antioxidant defense system

Ihsan, Muhammad; Yang, Li; Ahmad, Shakeel; Farooq, Saqib; Khan, Ahmad; Nisar, Muhammad; Ullah, Saif; Adnan, Muhammad; Ali, Shamsher; Liang, Qing Ping; Zhou, X. B.

doi:10.1093/plphys/kiad027

Cited by 37 publications

(19 citation statements)

References 67 publications

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“…Theoretically, the stomatal properties are critical indicators to evaluate the plant response to stress environments [50]. In this study, we found that single drought or cold stress dramatically decreased the stomatal aperture (the ratio of width to length), which is consistent with the results in Zea mays L. [51]. Drought stress induced more direct and rapid injury on stomatal closure than cold stress, which was manifested as lower stomatal width in drought-treated E. nutans.…”

Section: Discussionsupporting

confidence: 87%

Combined Cold and Drought Stress-Induced Response of Photosynthesis and Osmotic Adjustment in Elymus nutans Griseb.

Liu,

Wang,

Gong

et al. 2023

Agronomy

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Elymus nutans Griseb. is a dominant forage in the Qinghai–Tibetan Plateau. However, the combined cold and drought (CD) stress is a major problem inhibiting its growth, development, and yield. Here, the responses of morphological, photosynthetic, osmoregulation levels, and signal transduction under cold, drought, and CD stress were explored. Both cold- and drought-stressed plants showed varying degrees of damage. In addition, CD stress led to more severe damage than single stress, especially in total biomass, photosynthetic capacity, and electron transfer efficiency. The total biomass, net photosynthetic rate, and maximal quantum yield of photosystem II (PSII) photochemistry reduced by 61.47%, 95.80%, and 16.06% in comparison with the control, respectively. Meanwhile, CD stress was accompanied by lower chlorophyll contents, down-regulated expression level of key photosynthetic enzymes (EnRbcS, EnRbcL, and EnRCA), stomatal closure, disrupted chloroplast ultrastructure, and reduced starch content. Furthermore, CD stress induced some adaptability responses in cold- and drought-tolerant E. nutans seedlings. The combined stress provoked alterations in both cold- and drought-related transcription factors and responsive genes. EnCBF12, EnCBF9, EnCBF14, and EnCOR14α were significantly up-regulated under cold or drought stress, and the transcript level of EnCBF3 and EnCBF12 was even 2.94 and 12.59 times higher than control under CD treatment, which indicated the key role of transcription factors activation in coping with CD stress. In addition, the content of soluble sugar, reducing sugar, proline, glycine betaine, and other osmolytes was significantly improved under CD stress. Therefore, we demonstrated that exposure to CD stress led to severe morphological and photosynthetic damage and revealed the acclimation to the cold and drought stress combination via osmotic adjustment and transcription factors activation in the Tibetan wild E. nutans.

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Section: Discussionsupporting

confidence: 87%

Combined Cold and Drought Stress-Induced Response of Photosynthesis and Osmotic Adjustment in Elymus nutans Griseb.

Liu,

Wang,

Gong

et al. 2023

Agronomy

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“…35−37 Among them, chlorophyll is the key substance that is used to absorb sunlight, and pores are an important channel for plant respiration and photosynthesis. 38,39 As shown in Figures 6 and 7C, the results revealed that the contents of Pn, Tr, WUE, Gs, chlorophyll a, chlorophyll b, total chlorophyll, and starch significantly decreased in the TMV treatment group at 1−5 dpi. The values of Pn, Tr, WUE, Gs, chlorophyll a, chlorophyll b, total chlorophyll, and starch increased by 135, 105, 20.0, 17.4, 40.9, 40.9, 41.9, and 117%, respectively, after treatment with compound T 8 at 5 dpi and were similar to those of the mock and NNM groups.…”

Section: Photosynthesis and Stomatal Parameters And Chlorophyll Contentmentioning

confidence: 80%

“…Organic matter accumulates by photosynthesis in plants, and leaves are the main organs of photosynthesis. − Among them, chlorophyll is the key substance that is used to absorb sunlight, and pores are an important channel for plant respiration and photosynthesis. , …”

Section: Resultsmentioning

confidence: 99%

Repairing Host Damage Caused by Tobacco Mosaic Virus Stress: Design, Synthesis, and Mechanism Study of Novel Oxadiazole and Arylhydrazone Derivatives

Wen,

Liu,

Zheng

et al. 2024

J. Agric. Food Chem.

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Tobacco mosaic virus (TMV), as one of the most traditional and extensive biological stresses, poses a serious threat to plant growth and development. In this work, a series of 1-phenyl/tertbutyl-5-amino-4-pyrazole oxadiazole and arylhydrazone derivatives was synthesized. Bioassay evaluation demonstrated that the title compounds (P 1 –P 18 ) without a “thioether bond” lost their anti-TMV activity, while some of the ring-opening arylhydrazone compounds exhibited superior in vivo activity against TMV in tobacco. The EC50 value of title compound T 8 for curative activity was 139 μg/mL, similar to that of ningnanmycin (NNM) (EC50 = 152 μg/mL). Safety analysis revealed that compound T 8 had no adverse effects on plant growth or seed germination at a concentration of 250 μg/mL. Morphological observation revealed that compound T 8 could restore the leaf tissue of a TMV-stressed host and the leaf stomatal aperture to normal. A mechanism study further revealed that compound T 8 not only restored the photosynthetic and growth ability of the damaged host to normal levels but also enhanced catalase (CAT) activity and reduced the content of malondialdehyde (MDA) and hydrogen peroxide (H2O2) in the damaged host, thereby reducing the oxidation damage to the host. TMV–green fluorescent protein (GFP) experiments further demonstrated that compound T 8 not only slowed the transmission speed of TMV in the host but also inhibited its reproduction. All of the experimental results demonstrated that compound T 8 could reduce the oxidative damage caused by TMV stress and regulate the photosynthetic ability of the host, achieving the ability to repair damage, to make the plant grow normally.

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“…Studies have shown that MEL regulates the ascorbate-glutathione (AsA-GSH) cycle and proline metabolism while increasing the activity of antioxidant enzymes, which in turn protects the plant . Additionally, MEL ensures the proper functioning of the light system by reducing malondialdehyde (MDA) and electrolyte leakage while increasing chlorophyll concentration and accelerating nonphotochemical quenching . When exogenous MEL is applied, it stimulates the gene expression of Cu / Zn SOD , Fe / Zn SOD , and CAT , thereby improving plant performance and antioxidant activities under cold stress .…”

Section: Introductionmentioning

confidence: 99%

“…9 Additionally, MEL ensures the proper functioning of the light system by reducing malondialdehyde (MDA) and electrolyte leakage while increasing chlorophyll concentration and accelerating nonphotochemical quenching. 10 When exogenous MEL is applied, it stimulates the gene expression of Cu/Zn SOD, Fe/Zn SOD, and CAT, thereby improving plant performance and antioxidant activities under cold stress. 11 Furthermore, MEL upregulates the expression of cold signaling pathway genes such as C-repeat binding factor (CBF), thus enhancing plant cold tolerance.…”

Section: ■ Introductionmentioning

confidence: 99%

Exogenous Melatonin Promotes Cold Tolerance in Grape Seedlings: Physiological, Transcriptomic, and Functional Evidence

Li,

Lv,

et al. 2023

J. Agric. Food Chem.

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Melatonin-priming enhances maize seedling drought tolerance by regulating the antioxidant defense system

Cited by 37 publications

References 67 publications

Combined Cold and Drought Stress-Induced Response of Photosynthesis and Osmotic Adjustment in Elymus nutans Griseb.

Combined Cold and Drought Stress-Induced Response of Photosynthesis and Osmotic Adjustment in Elymus nutans Griseb.

Repairing Host Damage Caused by Tobacco Mosaic Virus Stress: Design, Synthesis, and Mechanism Study of Novel Oxadiazole and Arylhydrazone Derivatives

Exogenous Melatonin Promotes Cold Tolerance in Grape Seedlings: Physiological, Transcriptomic, and Functional Evidence

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