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Melatonin as an antioxidant and its semi-lunar rhythm in green macroalga Ulva sp.

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Melatonin as an antioxidant and its semi-lunar rhythm in green macroalga Ulva sp.

Content Provider	PubMed Central
Author	Tal, Ofir Haim, Abraham Harel, Orna Gerchman, Yoram
Copyright Year	2011
Abstract	The presence and role of melatonin in plants are still under debate owing to difficulties of identification and quantification. Accordingly, although it has been frequently proposed that melatonin acts as an antioxidant in phototrophic organisms, experimental data on its physiological role are scarce. This study describes the use of a rapid and simple new method for quantification of melatonin in the marine macroalga Ulva sp., organisms routinely exposed to tide-related environmental stresses and known for their high tolerance to abiotic conditions. The method was used here to show that exposure to oxidative stress-inducing environmental conditions (elevated temperature and heavy metals) induced a rise in melatonin level in the algae. Addition of exogenous melatonin alleviated the algae from cadmium-induced stress. Interestingly, although the algae were taken from a culture growing free floating and kept under constant photoperiod and water level, they exhibited a semi-lunar rhythm of melatonin levels that correlated with predicted spring tides. The correlation can probably be interpreted as reflecting preparation for predicted low tides, when the algae are exposed to increasing temperature, desiccation, and salinity, all known to induce oxidative stress. Given the simplicity of the described method it can easily be adapted for the study of melatonin in many other phototrophic organisms. These results provide, for the first time, experimental data that support both an antioxidant role for melatonin and its semi-lunar rhythm in macroalgae.
Related Links	http://dx.doi.org/10.1093/jxb/erq378
Ending Page	1910
Page Count	8
Starting Page	1903
File Format	PDF
ISSN	00220957
e-ISSN	14602431
Journal	Journal of Experimental Botany
Issue Number	6
Volume Number	62
Language	English
Publisher	Oxford University Press
Publisher Date	2011-03-01
Access Restriction	Open
Rights Holder	Oxford University Press
Subject Keyword	Plant Science Physiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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Melatonin as an antioxidant and its semi-lunar rhythm in green macroalga Ulva sp.

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Melatonin as an antioxidant and its semi-lunar rhythm in green macroalga Ulva sp.

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Melatonin as an antioxidant and its semi-lunar rhythm in green macroalga Ulva sp.

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Melatonin as an antioxidant and its semi-lunar rhythm in green macroalga Ulva sp.