Melatonin enhances drought stress tolerance in maize through coordinated regulation of carbon and nitrogen assimilation

Ren, Jianhong; Yang, Xiaoxiao; Ma, Chunying; Wang, Yuling; Zhao, Juan

doi:10.1016/j.plaphy.2021.09.007

Cited by 41 publications

(31 citation statements)

References 77 publications

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“…Different lines of evidence highlight the effect of MT on photosynthesis of plants ( Li H. et al, 2017 ; Liang et al, 2019 ; Yan et al, 2021 ). MT could trigger many genes and enzymes associated with carbon and nitrogen metabolism which in turn improved photosynthesis to promote plant growth and development under abiotic stress ( Debnath et al, 2019 ; Iqbal et al, 2021 ; Ren et al, 2021 ). Here, we found that cucumber seedlings in the MT treatment showed a higher daily increase in leaf area than those in the H 2 O treatment under chilling stress, which was related to the higher Pn of the MT treatment following 1 day of chilling stress ( Figure 4A ).…”

Section: Discussionmentioning

confidence: 99%

Melatonin Promotes the Chilling Tolerance of Cucumber Seedlings by Regulating Antioxidant System and Relieving Photoinhibition

Zhang

Feng²,

Jing

et al. 2021

Front. Plant Sci.

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Chilling adversely affects the photosynthesis of thermophilic plants, which further leads to a decline in growth and yield. The role of melatonin (MT) in the stress response of plants has been investigated, while the mechanisms by which MT regulates the chilling tolerance of chilling-sensitive cucumber remain unclear. This study demonstrated that MT positively regulated the chilling tolerance of cucumber seedlings and that 1.0 μmol⋅L–1 was the optimum concentration, of which the chilling injury index, electrolyte leakage (EL), and malondialdehyde (MDA) were the lowest, while growth was the highest among all treatments. MT triggered the activity and expression of antioxidant enzymes, which in turn decreased hydrogen peroxide (H2O2) and superoxide anion (O2⋅–) accumulation caused by chilling stress. Meanwhile, MT attenuated the chilling-induced decrease, in the net photosynthetic rate (Pn) and promoted photoprotection for both photosystem II (PSII) and photosystem I (PSI), regarding the higher maximum quantum efficiency of PSII (Fv/Fm), actual photochemical efficiency (ΦPSII), the content of active P700 (ΔI/I0), and photosynthetic electron transport. The proteome analysis and western blot data revealed that MT upregulated the protein levels of PSI reaction center subunits (PsaD, PsaE, PsaF, PsaH, and PsaN), PSII-associated protein PsbA (D1), and ribulose-1,5-bisphosphate carboxylase or oxygenase large subunit (RBCL) and Rubisco activase (RCA). These results suggest that MT enhances the chilling tolerance of cucumber through the activation of antioxidant enzymes and the induction of key PSI-, PSII-related and carbon assimilation genes, which finally alleviates damage to the photosynthetic apparatus and decreases oxidative damage to cucumber seedlings under chilling stress.

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Section: Discussionmentioning

confidence: 99%

Melatonin Promotes the Chilling Tolerance of Cucumber Seedlings by Regulating Antioxidant System and Relieving Photoinhibition

Zhang

Feng²,

Jing

et al. 2021

Front. Plant Sci.

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“…In this study, we evaluated the parameters of PSI and PSII to unveil the damaging effects of LT and HH on photosynthesis, PSII activity, and the role of MT in plant defense ( Figure 1 ). MT application triggers many genes and enzymes associated with C and N metabolism, which in turn improves photosynthesis and consequently promotes plant growth and development under abiotic stress conditions ( Ren et al, 2021 ). We found that Pn, Gs, and E, were markedly reduced by LTHH stress, which is consistent with previous studies ( Ding et al, 2017a , 2018 ) in which exogenous application of MT enhanced photosynthesis under cold stress.…”

Section: Discussionmentioning

confidence: 99%

Melatonin Rescues Photosynthesis and Triggers Antioxidant Defense Response in Cucumis sativus Plants Challenged by Low Temperature and High Humidity

et al. 2022

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Environmental factors such as low temperature (LT) and high humidity (HH) hinder plant growth and development in plastic tunnels and solar greenhouses in the cold season. In this study, we examined the effect of melatonin (MT) on shoot-based tolerance to LT and HH conditions in cucumber (Cucumis sativus) seedlings and explored its underlying mechanism. LT and HH stress inhibited growth and biomass accumulation, produced leaf chlorosis, led to oxidative stress, lowered chlorophyll and carotenoid contents, reduced photosynthetic and photosystem II (PSII) activities, and increased the level of intercellular carbon dioxide and the non-photochemical quenching of photosystem I (PSI) and PSII. However, foliar application of MT significantly improved the morphological indices and photosynthetic efficiency of cucumber seedlings, which entailed the elevation of electrolyte leakage, lipid peroxidation, and reactive oxygen species accumulation by boosting the antioxidant enzyme defense system under LT and HH conditions. Additionally, the measurement of nitrogen (N), magnesium (Mg), and iron (Fe) contents in roots and leaves showed that MT significantly augmented the nutrient uptake of cucumber seedlings exposed to LT and HH stresses. Furthermore, MT application increased the transcripts levels of genes encoding antioxidant enzymes under LT and HH conditions, whereas treatment with LT and HH suppressed these genes, suggesting that MT application increases the LT and HH tolerance of cucumber seedlings. Overall, our results suggest that MT application increases the tolerance of cucumber seedlings to LT and HH stress by enhancing the plant morphometric parameters, regulating PSI and PSII, and activating the antioxidant defense mechanism. Thus, the exogenous application of MT could be potentially employed as a strategy to improve the LT and HH tolerance of cucumber.

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“…Để cải thiện năng suất nông nghiệp, điều cấp thiết là phải nâng cao khả năng chịu hạn của cây trồng bằng nhiều cách tiếp cận khác nhau. Việc ứng dụng các chất điều hòa sinh trưởng thực vật ngoại sinh được coi là một cách hiệu quả để tăng cường khả năng chịu hạn cho cây trồng [1], [2].…”

Section: Giới Thiệuunclassified

“…Melatonin (N-acetyl-5-methoxytryptamine) hoạt động như một chất điều hòa sinh trưởng, được phát hiện ở thực vật vào năm 1995, đóng vai trò quan trọng trong nhiều quá trình như sự nảy mầm của hạt giống, sự phát triển của rễ, quang hợp, sự ra hoa và già hóa của quả. Quan trọng hơn, melatonin còn là tín hiệu trung gian của cây trồng đối với các stress phi sinh học [2]. Nhiều nghiên cứu cho thấy, melatonin giảm thiểu stress hạn thông qua cơ chế trực tiếp là "nhặt" các gốc tự do (reactive oxygen species-ROS) và gián tiếp bằng việc phục hồi hệ thống quang hợp, cân bằng nước, bảo vệ màng tế bào [3], [4].…”

Section: Giới Thiệuunclassified

Cải Thiện Khả Năng Chịu Hạn Của Cây Ngô Non Bằng Việc Xử Lý Melatonin Ngoại Sinh

Huệ¹,

Quyền²

2022

TNUJST

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Hạn hán ức chế sự sinh trưởng và giảm năng suất của ngô. Vì vậy, việc tăng cường khả năng chịu hạn cho ngô là điều cấp thiết. Trong nghiên cứu này, hạt giống ngô nếp lai HN68 và cây ngô non 3 lá được xử lý melatonin với 3 nồng độ 50 µM, 100 µM và 150 µM. Cây ngô được xử lý hạn bằng cách không tưới nước và cách li với nước. Kết quả nghiên cứu cho thấy, việc xử lý melatonin 150 µM cho ngô làm giảm tỷ lệ thiệt hại và tăng chỉ số chịu hạn tương đối. Ngô được xử lý melatonin 150 µM đều thể hiện sự vượt trội về một số chỉ tiêu hóa sinh như hàm lượng đường khử, hàm lượng proline, hoạt độ enzyme α-amylase, catalase so với đối chứng. Kết quả này chứng tỏ ứng dụng melatonin ngoại sinh là giải pháp tiềm năng có thể cải thiện khả năng chịu hạn cho cây ngô.

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Melatonin enhances drought stress tolerance in maize through coordinated regulation of carbon and nitrogen assimilation

Cited by 41 publications

References 77 publications

Melatonin Promotes the Chilling Tolerance of Cucumber Seedlings by Regulating Antioxidant System and Relieving Photoinhibition

Melatonin Promotes the Chilling Tolerance of Cucumber Seedlings by Regulating Antioxidant System and Relieving Photoinhibition

Melatonin Rescues Photosynthesis and Triggers Antioxidant Defense Response in Cucumis sativus Plants Challenged by Low Temperature and High Humidity

Cải Thiện Khả Năng Chịu Hạn Của Cây Ngô Non Bằng Việc Xử Lý Melatonin Ngoại Sinh

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