Melatonin acts as a growth‐stimulating compound in some monocot species

Melatonin acts as a growth‐stimulating compound in some monocot species Abstract: In a recent study melatonin (N‐acetyl‐5‐methoxytryptamine), a well‐investigated animal molecule but minimally studied in plants, was seen to have a physiological role as growth‐promoting molecule in lupin hypocotyls. In the present study, the role of melatonin as a growth promoter is extended to coleoptiles of canary grass, wheat, barley and oat, in which it shows a relative auxinic activity (with respect to indole‐3‐acetic acid (IAA), the main auxin in plants) of between 10 and 55%. In addition, melatonin is seen to have an important inhibitory growth effect on roots similar to that played by auxin. The quantitation by liquid chromatography with electrochemical detection and identification by tandem mass spectrometry of melatonin and IAA in etiolated coleoptiles of the monocots assayed showed that both compounds are present in similar levels in these tissues. These results point to the co‐existence of auxin and melatonin in tissues and raises the possibility of their co‐participation in some physiological actions as auxinic hormones in plants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Pineal Research Wiley

Melatonin acts as a growth‐stimulating compound in some monocot species

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Publisher
Wiley
Copyright
Copyright © 2005 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0742-3098
eISSN
1600-079X
DOI
10.1111/j.1600-079X.2005.00226.x
Publisher site
See Article on Publisher Site

Abstract

Abstract: In a recent study melatonin (N‐acetyl‐5‐methoxytryptamine), a well‐investigated animal molecule but minimally studied in plants, was seen to have a physiological role as growth‐promoting molecule in lupin hypocotyls. In the present study, the role of melatonin as a growth promoter is extended to coleoptiles of canary grass, wheat, barley and oat, in which it shows a relative auxinic activity (with respect to indole‐3‐acetic acid (IAA), the main auxin in plants) of between 10 and 55%. In addition, melatonin is seen to have an important inhibitory growth effect on roots similar to that played by auxin. The quantitation by liquid chromatography with electrochemical detection and identification by tandem mass spectrometry of melatonin and IAA in etiolated coleoptiles of the monocots assayed showed that both compounds are present in similar levels in these tissues. These results point to the co‐existence of auxin and melatonin in tissues and raises the possibility of their co‐participation in some physiological actions as auxinic hormones in plants.

Journal

Journal of Pineal ResearchWiley

Published: Sep 1, 2005

References

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