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Int. J. Mol. Sci. 2017, 18(5), 991; doi:10.3390/ijms18050991

High Concentration of Melatonin Regulates Leaf Development by Suppressing Cell Proliferation and Endoreduplication in Arabidopsis

Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources and College of Biology, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
These authors contributed equally to this work.
Authors to whom correspondence should be addressed.
Academic Editor: Russel J. Reiter
Received: 27 March 2017 / Revised: 22 April 2017 / Accepted: 2 May 2017 / Published: 5 May 2017
(This article belongs to the Special Issue Melatonin and Its Analogues: Experimental and Clinical Aspects)
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N-acetyl-5-methoxytryptamine (Melatonin), as a crucial messenger in plants, functions in adjusting biological rhythms, stress tolerance, plant growth and development. Several studies have shown the retardation effect of exogenous melatonin treatment on plant growth and development. However, the in vivo role of melatonin in regulating plant leaf growth and the underlying mechanism are still unclear. In this study, we found that high concentration of melatonin suppressed leaf growth in Arabidopsis by reducing both cell size and cell number. Further kinetic analysis of the fifth leaves showed that melatonin remarkably inhibited cell division rate. Additionally, flow cytometic analysis indicated that melatonin negatively regulated endoreduplication during leaf development. Consistently, the expression analysis revealed that melatonin regulated the transcriptional levels of key genes of cell cycle and ribosome. Taken together, this study suggests that high concentration of melatonin negatively regulated the leaf growth and development in Arabidopsis, through modulation of endoreduplication and the transcripts of cell cycle and ribosomal key genes. View Full-Text
Keywords: melatonin; leaf growth; cell proliferation; cell expansion; endoreduplication; Arabidopsis melatonin; leaf growth; cell proliferation; cell expansion; endoreduplication; Arabidopsis

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Wang, Q.; An, B.; Shi, H.; Luo, H.; He, C. High Concentration of Melatonin Regulates Leaf Development by Suppressing Cell Proliferation and Endoreduplication in Arabidopsis. Int. J. Mol. Sci. 2017, 18, 991.

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