Melatonin suppression of heat-induced leaf senescence involves changes in abscisic acid and cytokinin biosynthesis and signaling pathways in perennial ryegrass ( Lolium perenne L.)

Zhang, Jing; Shi, Yi; Zhang, Xunzhong; Du, Hongmei; Xu, Bin; Huang, Bingru

doi:10.1016/j.envexpbot.2017.02.012

Cited by 250 publications

(158 citation statements)

References 49 publications

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“…Since MEL integrates with ABA during numerous biological processes, it becomes easy to approximate that MEL might have interactions with CK during plant growth and development. Exogenous application of MEL improved the endogenous levels of MEL and CK, while decreasing the ABA content under heat stress . It was also observed that MEL treatment significantly upregulated the transcripts of CK biosynthesis genes and its signaling transcription factors (type B ARRs), while suppressing the ABA biosynthesis and signaling genes under heat stress.…”

Section: Mel: a Key Regulator In Plant Growth Developmentmentioning

confidence: 85%

“…Cytokinins (CKs) are involved in cell cycle regulation and influence other developmental programs in plants . Endogenous levels of CK significantly modulate, under diverse biotic and abiotic stresses, and inhibit CK signaling pathways to accelerate senescence . In CK signaling pathway, ARR genes act as downstream transcriptional regulators .…”

Section: Mel: a Key Regulator In Plant Growth Developmentmentioning

confidence: 99%

“…Since, CK is implicated in natural or stress‐induced senescence. Therefore, to establish a MEL and CK interaction, particularly under heat stress, Zhang et al conducted an experiment in cool‐season perennial grass species. Their results demonstrated that MEL reduced leaf senescence through its integration with ABA and CK or by regulating their metabolic pathways.…”

Section: Mel: a Key Regulator In Plant Growth Developmentmentioning

confidence: 99%

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Phytomelatonin: Recent advances and future prospects

Kanwar

Zhou

2018

Journal of Pineal Research

175

109

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Melatonin (MEL) has been revealed as a phylogenetically conserved molecule with a ubiquitous distribution from primitive photosynthetic bacteria to higher plants, including algae and fungi. Since MEL is implicated in numerous plant developmental processes and stress responses, the exploration of its functions in plant has become a rapidly progressing field with the new paradigm of involvement in plants growth and development. The pleiotropic involvement of MEL in regulating the transcripts of numerous genes confirms its vital involvement as a multi‐regulatory molecule that architects many aspects of plant development. However, the cumulative research in plants is still preliminary and fragmentary in terms of its established functions compared to what is known about MEL physiology in animals. This supports the need for a comprehensive review that summarizes the new aspects pertaining to its functional role in photosynthesis, phytohormonal interactions under stress, cellular redox signaling, along with other regulatory roles in plant immunity, phytoremediation, and plant microbial interactions. The present review covers the latest advances on the mechanistic roles of phytomelatonin. While phytomelatonin is a sovereign plant growth regulator that can interact with the functions of other plant growth regulators or hormones, its qualifications as a complete phytohormone are still to be established. This review also showcases the yet to be identified potentials of phytomelatonin that will surely encourage the plant scientists to uncover new functional aspects of phytomelatonin in plant growth and development, subsequently improving its status as a potential new phytohormone.

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Section: Mel: a Key Regulator In Plant Growth Developmentmentioning

confidence: 85%

Section: Mel: a Key Regulator In Plant Growth Developmentmentioning

confidence: 99%

Section: Mel: a Key Regulator In Plant Growth Developmentmentioning

confidence: 99%

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Phytomelatonin: Recent advances and future prospects

Kanwar

Zhou

2018

Journal of Pineal Research

175

109

View full text Add to dashboard Cite

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“…Leaf tissue (~2.5 g) was ground to a fine powder with liquid nitrogen, and total chlorophyll was extracted with 80% cold acetone overnight at 4°C. The chlorophyll content in the extract was quantified spectrophotometrically by measuring its optical density at 663 and 645 nm as described previously . The maximum PSII quantum yield (Fv/Fm) and actual photochemical efficiency (Y(II)) were calculated noninvasively using Imaging‐PAM‐M series chlorophyll fluorometer (Heinz Walz) equipped with a charge‐coupled device (CCD) camera that enables the capture of high‐resolution digital images of the emitted fluorescence.…”

Section: Methodsmentioning

confidence: 99%

“…ABA may advance senescence via ethylene‐dependent or ethylene‐independent pathways . Interestingly, exogenous melatonin application delayed heat‐induced senescence in perennial ryegrass leaves by inhibiting the ABA biosynthesis and signaling, suggesting the antagonism between melatonin and ABA . However, how and by what means melatonin counteracts ABA during leaf senescence, particularly, and more importantly, in the postharvest senescence of major horticultural products such as Chinese flowering cabbage, remains largely unknown.…”

Section: Introductionmentioning

confidence: 99%

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

Tan

Fan

Kuang

et al. 2019

Journal of Pineal Research

145

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Melatonin and abscisic acid (ABA) play contrasting roles in regulating leaf senescence in plants. The molecular mechanism underlying the interaction between melatonin and ABA involved in leaf senescence, however, remains poorly defined. Herein, we found that exogenous application of melatonin delayed the senescence of Chinese flowering cabbage, accompanied by reduced expression of chlorophyll catabolic and ABA biosynthetic genes, and a lower endogenous ABA level. Significantly, three nucleus‐localized transcriptional activators BrABF1, BrABF4, and BrABI5 were identified, and their expressions were repressed by melatonin. In vitro and in vivo binding experiments revealed that BrABF1, BrABF4, and BrABI5 activated the transcription of a series of ABA biosynthetic and chlorophyll catabolic genes by physically binding to their promoters. Moreover, transient over‐expression of BrABF1, BrABF4, and BrABI5 in tobacco leaves induced ABA accumulation and promoted chlorophyll degradation by upregulating tobacco ABA biosynthetic and chlorophyll catabolic genes, resulting in the accelerated leaf senescence. These effects were significantly attenuated by melatonin treatment. Our findings suggest that melatonin‐mediated inhibition of leaf senescence involves suppression of ABFs‐mediated ABA biosynthesis and chlorophyll degradation. Unraveling of the molecular regulatory mechanism of leaf senescence controlled by ABA and melatonin expands our understanding of the regulation of this phenomenon and offers potentially more effective molecular breeding strategies for extending the shelf‐life of Chinese flowering cabbage.

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