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Open AccessArticle

Exogenous Melatonin Delays Methyl Jasmonate-Triggered Senescence in Tomato Leaves

by Meiling Wang 1, Tong Zhang 2 and Fei Ding 1,2,*
1
College of Life Sciences, Liaocheng University, Liaocheng 252000, China
2
College of Forestry, Northwest A & F University, Yangling 712100, China
*
Author to whom correspondence should be addressed.
Agronomy 2019, 9(12), 795; https://doi.org/10.3390/agronomy9120795
Received: 3 October 2019 / Revised: 19 November 2019 / Accepted: 19 November 2019 / Published: 22 November 2019
Leaf senescence represents the last stage of leaf development and is highly regulated by plant hormones and environmental factors. Leaf senescence limits growth and yields in crops, leading to a significant portion of agricultural loss. It is thus crucial to develop strategies to delay this physiological process. Melatonin, an extensively studied molecule, has been demonstrated to play a role in the regulation of leaf senescence in plants. Here, we report the role of exogenous melatonin in the alleviation of methyl jasmonate (MeJA)-induced senescence in tomato (Solanum lycopersicum) leaves. The application of melatonin led to slower degradation of chlorophyll, reduced electrolyte leakage, decreased malondialdehyde (MDA) content, and reduced reactive oxygen species (ROS) levels in tomato leaves incubated with MeJA. In addition, melatonin repressed the upregulation of senescence-related genes (SAG and SEN) and chlorophyll degradation genes (SGR1 and PAO) in tomato leaves exposed to MeJA. Furthermore, melatonin stimulated the activity of a Calvin-Benson Cycle enzyme sedoheptulose-1,7-bisphosphatase (SBPase) and alleviated the inhibition of SlSBPASE (tomato SBPase gene) expression and in MeJA-treated tomato leaves, suggesting an action of melatonin on the capacity for carbon fixation during senescence. Collectively, these results support a role for melatonin in the alleviation of MeJA-induced senescence in tomato leaves. This work also presents a case study that melatonin may be a useful agent in the delay of crop senescence in agricultural practice. View Full-Text
Keywords: melatonin; senescence; chlorophyll; reactive oxygen species; photosynthesis; tomato melatonin; senescence; chlorophyll; reactive oxygen species; photosynthesis; tomato
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Wang, M.; Zhang, T.; Ding, F. Exogenous Melatonin Delays Methyl Jasmonate-Triggered Senescence in Tomato Leaves. Agronomy 2019, 9, 795.

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