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Open AccessArticle

Exogenous Melatonin Delays Dark-Induced Grape Leaf Senescence by Regulation of Antioxidant System and Senescence Associated Genes (SAGs)

1
Wuwei Academy of Forestry Science, Wuwei 733000, China
2
College of Horticulture, Hebei Agricultural University, Baoding 071001, China
3
Economic Crops Technical Advising Station of Huzhou City, Huzhou 313000, China
4
Wuwei Management Office for Forestry and Fruit Industry, Wuwei 733000, China
5
Department of Plant Biology, Faculty of Biological Sciences, Tarbiat Modares University, Teheran 14115-111, Iran
6
College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China
*
Author to whom correspondence should be addressed.
Plants 2019, 8(10), 366; https://doi.org/10.3390/plants8100366
Received: 23 August 2019 / Revised: 18 September 2019 / Accepted: 19 September 2019 / Published: 23 September 2019
(This article belongs to the Special Issue Leaf Senescence)
Leaf senescence is a developmentally programmed and degenerative process which comprises the last stage of the life cycle of leaves. In order to understand the melatonin effect on grapevine leaf senescence, the dark treatment on detached leaves of Vitis vinifera L. cv. Red Globe was performed to induce leaf senescence at short period of time. Then, a series of physiological and molecular changes in response to exogenous melatonin were measured. Results showed that 100 μM of melatonin treatment could significantly delay the dark induced leaf senescence, which is accompanied by the decreased production of reactive oxygen species (ROS). Meanwhile, melatonin treatment could increase the scavenging activity of antioxidant enzymes, such as peroxidase (POD), superoxide dismutase (SOD), and catalase (CAT). Simultaneously, ascorbate (AsA) and glutathione (GSH) contents, the activities of ascorbate peroxidase (APX), and glutathione reductase (GR) were significantly higher than control treatment in samples treated with melatonin. Furthermore, melatonin treatment showed to suppress the expression of leaf senescence-associated genes (SAGs). All these results demonstrated that melatonin could activate the antioxidant and Ascorbate-Glutathione (AsA-GSH) cycle system and repress the expression of SAGs that lead to delay the dark induced grape leaf senescence. View Full-Text
Keywords: antioxidant enzymes; grape; leaf senescence; melatonin; reactive oxygen species; ascorbate-glutathione; leaf senescence-associated genes antioxidant enzymes; grape; leaf senescence; melatonin; reactive oxygen species; ascorbate-glutathione; leaf senescence-associated genes
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MDPI and ACS Style

Shi, X.; Xu, S.; Mu, D.; Sadeghnezhad, E.; Li, Q.; Ma, Z.; Zhao, L.; Zhang, Q.; Wang, L. Exogenous Melatonin Delays Dark-Induced Grape Leaf Senescence by Regulation of Antioxidant System and Senescence Associated Genes (SAGs). Plants 2019, 8, 366.

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