Journal
PLANTS-BASEL
Volume 8, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/plants8100366
Keywords
antioxidant enzymes; grape; leaf senescence; melatonin; reactive oxygen species; ascorbate-glutathione; leaf senescence-associated genes
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Funding
- Youth Science and Technology Fund Plan of Gansu Province, China [17JR5RH353]
- National Natural Science Foundation of China [31460499]
- Forestry Science & Technology Project of Gansu province, China [2015kj023]
- Found of Engineering Technology Research Center for Rapid Propagation of Wine Grape seedlings in Gansu Province [GSGCZX2018002]
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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 mu M 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.
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