Melatonin delays leaf senescence of Chinese flowering cabbage by suppressing ABFs‐mediated abscisic acid biosynthesis and chlorophyll degradation

Tan, Xiaoxiao; Fan, Zhengqiu; Kuang, Jian-fei; Lu, Wang-jin; Reíter, Russel J.; Lakshmanan, Prakash; Su, Xiaolu; Zhou, Jie; Chen, Jian-Ye; Shan, Wei

doi:10.1111/jpi.12570

Cited by 131 publications

(57 citation statements)

References 57 publications

(150 reference statements)

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“…For instance, a class I TCP TF GhTCP19 from gladiolus, has recently been reported to positively regulate corm dormancy release by suppressing the transcription of an ABA biosynthetic gene GhNCED , while activating the transcription of cytokinins biosynthetic gene GhIPT and signal transduction gene GhARR [27]. As ABA, JA and cytokinins have been demonstrated to accelerate and delay leaf senescence of Chinese flowering cabbage respectively [18,33,41], whether BrTCP21 or other TCP members such as GhTCP19 can exert dual regulatory roles in hormones-mediated leaf senescence, will be an interesting topic for consideration in the future.…”

Section: Resultsmentioning

confidence: 99%

Activation of the Transcription of BrGA20ox3 by a BrTCP21 Transcription Factor Is Associated with Gibberellin-Delayed Leaf Senescence in Chinese Flowering Cabbage during Storage

Xiao

Zeng

et al. 2019

IJMS

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Several lines of evidence have implicated the involvement of the phytohormone gibberellin (GA) in modulating leaf senescence in plants. However, upstream transcription factors (TFs) that regulate GA biosynthesis in association with GA-mediated leaf senescence remain elusive. In the current study, we report the possible involvement of a TEOSINTE BRANCHED1/CYCLOIDEA/PCF (TCP) TF BrTCP21 in GA-delayed leaf senescence in Chinese flowering cabbage. Exogenous GA3 treatment maintained a higher value of maximum PSII quantum yield (Fv/Fm) and total chlorophyll content, accompanied by the repression of the expression of senescence-associated genes and chlorophyll catabolic genes, which led to the delay of leaf senescence. A class I member of TCP TFs BrTCP21, was further isolated and characterized. The transcript level of BrTCP21 was low in senescing leaves, and decreased following leaf senescence, while GA3 could keep a higher expression level of BrTCP21. BrTCP21 was further found to be a nuclear protein and exhibit trans-activation ability through transient-expression analysis in tobacco leaves. Intriguingly, the electrophoretic mobility shift assay (EMSA) and transient expression assay illustrated that BrTCP21 bound to the promoter region of a GA biosynthetic gene BrGA20ox3, and activated its transcription. Collectively, these observations reveal that BrTCP21 is associated with GA-delayed leaf senescence, at least partly through the activation of the GA biosynthetic pathway. These findings expand our knowledge on the transcriptional mechanism of GA-mediated leaf senescence.

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Section: Resultsmentioning

confidence: 99%

Activation of the Transcription of BrGA20ox3 by a BrTCP21 Transcription Factor Is Associated with Gibberellin-Delayed Leaf Senescence in Chinese Flowering Cabbage during Storage

Xiao

Zeng

et al. 2019

IJMS

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“…Many studies have uncovered the possible cellular and physiological activities of phytomelatonin in plants. Phytomelatonin might acts as a plant stimulator that promotes seed germination, root development, and plant growth, as a stress protector that elevated plant tolerance to unfavorable environmental conditions, or as a growth regulator that influence flowering and fruit ripening (Van Tassel et al, 2001; Byeon and Back, 2014a; Zhang et al, 2015; Wang et al, 2018; Arnao and Hernández‐Ruiz, 2019a; Tan and Reiter, 2020). A few studies have suggested that phytomelatonin exerts its effects by regulating various elements related to the redox network or interfering with the activities of other phytohormones (Paredes et al, 2009; Arnao and Hernández‐Ruiz, 2018, 2019c; Wang et al, 2018).…”

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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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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“…Melatonin has proven to be a versatile regulator and participates in plant growth, development and stress responses. It participates in seed germination, lateral root formation, flowering, circadian rhythms, photosynthesis, senescence and response to various environmental stresses [26][27][28][29][30]. The biosynthesis of melatonin in plants is catalyzed by four successive enzymatic steps, including tryptophan decarboxylase (TDC), tryptamine 5-hydroxylase (T5H), serotonin N-acetyltransferase (SNAT), and N-acetylserotonin methyltransferase (ASMT)/caffeic acid O-methyltransferase (COMT) [31].…”

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confidence: 99%

Melatonin Application Improves Salt Tolerance of Alfalfa (Medicago sativa L.) by Enhancing Antioxidant Capacity

Cen

Wang

Liu

et al. 2020

Plants

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Alfalfa (Medicago sativa L.) is an important and widely cultivated forage grass. The productivity and forage quality of alfalfa are severely affected by salt stress. Melatonin is a bioactive molecule with versatile physiological functions and plays important roles in response to various biotic and abiotic stresses. Melatonin has been proven efficient in improving alfalfa drought and waterlogging tolerance in recent studies. In our reports, we applied melatonin exogenously to explore the effects of melatonin on alfalfa growth and salt resistance. The results demonstrated that melatonin application promoted alfalfa seed germination and seedling growth, and reduced oxidative damage under salt stress. Further application research found that melatonin alleviated salt injury in alfalfa plants under salt stress. The electrolyte leakage, malondialdehyde (MDA) content and H 2 O 2 content were significantly reduced, and the activities of catalase (CAT), peroxidase (POD), and Cu/Zn superoxide dismutase (Cu/Zn-SOD) were increased with melatonin pretreatment compared to control plants under salt stress with the upregulation of genes related to melatonin and antioxidant enzymes biosynthesis. Melatonin was also involved in reducing Na + accumulation in alfalfa plants. Our study indicates that melatonin plays a primary role as an antioxidant in scavenging H 2 O 2 and enhancing activities of antioxidant enzymes to improve the salt tolerance of alfalfa plants.Plants 2020, 9, 220 2 of 17 world's irrigated land affected by saline or sodic globally [7,8]. Salinity has become one of the most important environmental stress factors impairing worldwide agricultural productivity. Under salinity conditions, the seed germination, growth and development processes of alfalfa are inhibited and they finally impair the herbage yield, as well as the forage quality [9]. Breeding new alfalfa cultivars with high salt tolerance is always needed. Genetic engineering and conventional breeding have been proven efficient for improving salt tolerance of various plant species [10][11][12][13]. However, they are time-consuming and complicated. Exogenous application of certain plant growth regulators such as phytohormone and other small molecules has been proven efficient at overcoming the harmful effects of salt stress on plants [14][15][16][17]. Moreover, plant growth regulators in low concentrations always play a role in plants, and are cost-effective. Foliar spraying of salicylic acid (SA) on faba bean inhibits Na + accumulation and lipid peroxidation, improving the antioxidant resistance and finally mitigating the damage caused by salinity [18]. Exogenously applied poly-γ-glutamic acid on wheat maintains the Na + and K + homeostasis and enhances antioxidant capacity by alleviating salinity damage under salt stress conditions [19]. Exogenous spermidine application to salt-stressed cucumber improves the photosynthetic capacity and the activity of key enzymes for CO 2 fixation by regulating the expression of related genes, and tolerance to salinity is thus...

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Melatonin delays leaf senescence of Chinese flowering cabbage by suppressing ABFs‐mediated abscisic acid biosynthesis and chlorophyll degradation

Cited by 131 publications

References 57 publications

Activation of the Transcription of BrGA20ox3 by a BrTCP21 Transcription Factor Is Associated with Gibberellin-Delayed Leaf Senescence in Chinese Flowering Cabbage during Storage

Activation of the Transcription of BrGA20ox3 by a BrTCP21 Transcription Factor Is Associated with Gibberellin-Delayed Leaf Senescence in Chinese Flowering Cabbage during Storage

Melatonin: A master regulator of plant development and stress responses

Melatonin Application Improves Salt Tolerance of Alfalfa (Medicago sativa L.) by Enhancing Antioxidant Capacity

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