Putative regulatory molecules in plants: evaluating melatonin

Tassel, David L. Van; O’Neill, Sharman D.

doi:10.1034/j.1600-079x.2001.310101.x

Cited by 77 publications

(64 citation statements)

References 37 publications

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“…The specific role of MEL and SER in higher plants, remains in the dark (Van Tassel and Oneill 2001). MEL, first identified in edible plants (Dubbels et al 1995) has been subsequently found in many other plants (Murch et al 2000;Manchester et al 2000;Ramakrishna et al 2009).…”

Section: Introductionmentioning

confidence: 95%

Indoleamines and calcium enhance somatic embryogenesis in Coffea canephora P ex Fr

Ramakrishna

Giridhar

Jobin

et al. 2011

Plant Cell Tiss Organ Cult

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Melatonin (MEL) and serotonin (SER) are important indoleamines that are involved in neural transmission in mammalian cells. They are also known to be present in various genera of plants. The role (s) of these indoleamines in plants are not well known. In this study, the effects of SER, MEL, calcium, and calcium ionophore (A23187), a calcium channel activator, on somatic embryogenesis in Coffea canephora have been investigated. Adding 100 lM of either SER or MEL to strength Murashige and Skoog (MS) medium and 0.93 lM kinetin (KN) has resulted in enhanced induction of somatic embryogenesis, 85 ± 3 and 62 ± 6 embryos/callus, respectively. In the presence of either 5 mM calcium or 100 lM calcium ionophore A23187, number of somatic embryos/callus is also increased, with 56 ± 4 and 118 ± 10 somatic embryos/callus, respectively, compared to 25 ± 3 embryos/callus for control. The presence of 5 mM calcium chloride along with either 100 lM SER or 100 lM MEL, respectively, have also promoted somatic embryogenesis with induction of 105 ± 6 and 78 ± 2 somatic embryos/callus. While, addition of calcium ionophore A23187 along with either 100 lM SER or 100 lM MEL have produced 155 ± 12 or 135 ± 8 embryos/callus, respectively. In contrast, addition of such indoleamine inhibitors as 40 lM p-chlorophenylalanine (p-CPA), 20 lM fluoexitine hydrochloride (prozac), 1 mM verapamil hydrochloride (calcium channel blocker), and 1 mM ethylene glycol-bis (b-amino ethylether)-N, N, N 0 , N 0 -tetra acetic acid (EGTA) (a calcium chelator) individually, has inhibited induction of somatic embryos while reducing levels of endogenous pools of SER, MEL and indole-3-acetic acid (IAA) levels. Calcium imaging by laser scanning confocal microscopy (LSCM) has revealed high fluorescence intensity in callus treated with calcium and calcium ionophore A23187. Immunolocalization of SER in different tissues of C. canephora has revealed that it is localized in vascular tissues of stems, roots, and somatic embryos, as well as in endocarps (husks) of immature fruits.

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Section: Introductionmentioning

confidence: 95%

Indoleamines and calcium enhance somatic embryogenesis in Coffea canephora P ex Fr

Ramakrishna

Giridhar

Jobin

et al. 2011

Plant Cell Tiss Organ Cult

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“…The high level of this compound was found in flower buds of Datura metel L. but it decreased following the floral development (Murch et al 2009a). MEL was found also in fruits such as strawberries, kiwis, pineapples, bananas, apples and in grapes (Hattori et al 1995;Iriti et al 2006;Sae-Teaw et al 2013) as well as tart cherries (Manchester et al 2000) and tomatoes (Van Tassel and O'Neill 2001;Okazaki and Ezura 2009). This may be related to their high sensitivity to environmental stresses including UV radiation during buds development and plant growth (Murch et al 2009a).…”

Section: Melatonin In Plantsmentioning

confidence: 99%

Melatonin, an underestimated natural substance with great potential for agricultural application

2013

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Melatonin (MEL) was thought to be only a neurotransmitter found in vertebrates until its detection in other organisms including plants. Although the number of publications on MEL function in plants is expanding, the knowledge of this subject is still insufficient. Among many functions which MEL performs in plants, its role as an antioxidant and a growth promoter is most supported by experimental evidence. This compound is an independent plant growth regulator and it may mediate the activities of other plant growth regulators. Due to its antioxidant properties MEL may also stabilize cell redox status and protect tissues against reactive oxygen and nitrogen species which accumulated under stressful environment. Some researchers propose that MEL could be used to improve the phytoremediation efficiency of plants against different pollutants. In this paper we show that exogenous MEL applied into the seeds could be a good biostimulator improving not only seed germination, seedling/plant growth but also crop production especially under stress conditions. We also believe that this compound can increase food quality (the aspect of functional food) and may improve human health. Since MEL is inexpensive and safe for animals and humans its application as a biostimulator could be a good, feasible and cost-effective method useful in agriculture.

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“…A similar rhythmic fluctuation in the content of melatonin in the short-day plant Chenopodium rubrum has been reported (Kolar et al 1997). The elevation of melatonin in reproductive tissue, with declining melatonin level as the plant ages, was also observed in Pharbitis nil (Van Tassel and O'Neill 2001). Similarly, there was a 15-to 30-fold higher level of melatonin in very young, etiolated seedlings than has been found in any older, light adapted tissues (Murch et al 2000b).…”

Section: Melatonin Metabolism In Plantsmentioning

confidence: 63%

“…Unlike the classical antioxidants, melatonin is devoid of prooxidative activity, and all known intermediates generated by the interaction of melatonin with reactive species are also free radical scavengers . Van Tassel and O'Neill (2001) and Manchester et al (2000) proposed that melatonin plays an antioxidant role in fruit and seed development as a mechanism to increase the survival and perpetuation of species. The presence of melatonin in the walnut may be to protect the highly oxidizable lipids from oxidation, thereby preserving the viability of the nut .…”

Section: Melatonin and Plant Survivalmentioning

confidence: 99%

Neurotransmitters, neuroregulators and neurotoxins in the life of plants

Cao¹,

Cole²,

Murch³

2006

Can. J. Plant Sci.

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Cao, J., Cole, I. B. and Murch, S. J. 2006. Neurotransmitters, neuroregulators and neurotoxins in the life of plants. Can. J. Plant Sci. 86: 1183-1188. Recent evidence has shown that neurologically active compounds play an important role in the physiology of higher plants. The human neurotransmitter melatonin (N-acetyl-5-methoxytryptamine) has been found in more than 140 different plant species and is associated with flower and seed development, reproductive capacity and root growth. Hyperforin, once thought to be characteristic of St. John's wort (Hypericum perforatum L.), has now been found in several other plant species and preliminary findings indicate that it may function as a modulator of plant cell polarity and ion flow. The excitotoxin, β-methylamino-L-alanine, has been used to selectively isolate glutamate receptor mutants in Arabidopsis, and these studies are leading to new understandings of plant cell development. The study of these and other plant neurochemicals may lead to a new understanding of plant signal transmission and the mechanisms by which plant cells sense, interpret and respond to environmental cues. Mots clés: Neuromédiateurs, mélatonine, hyperforine, plante médicinale Plant cells produce a wide range of common and uncommon chemical compounds that ensure the survival of the individual and the species. Most frequently, plant responsive compounds are thought of as secondary metabolites, compounds that are not essential for the growth and development of the plant, but that accumulate in response to environmental stressors. However, there is another group of phytochemicals that includes compounds historically classified as primary or secondary metabolites that are essential for the reallocation of resources in plants in response to changing environmental factors. Neurologically active compounds fall into this mixed category and include such diverse examples as indoleacetic acid, caffeine, epinephrine, acetylcholine, opiates, nicotine, levodopa, serotonin, melatonin, hyperforin and many others. In mammalian systems, neurologically active compounds mediate brain function so that external stimuli are translated into immediate responses. The human neurotransmitter melatonin (N-acetyl-5-methoxytryptamine) is a ubiquitous, highly conserved molecule associated with timing of circadian rhythms in many organisms, including higher plants. Other compounds such as hyperforin, now isolated from several plant species, may function as serotonin transport inhibitors or nonspecific cation channel activators in human brains and potentially in higher plants. A different group of neuroregulatory molecules produced by plants overstimulate human neurons, resulting in neuronal cell damage and death. Excitotoxins such as β-methylamino-L-alanine not only affect human health but are also regulatory molecules redirecting plant growth. Plants lack the "flight or flight" response common

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Putative regulatory molecules in plants: evaluating melatonin

Cited by 77 publications

References 37 publications

Indoleamines and calcium enhance somatic embryogenesis in Coffea canephora P ex Fr

Indoleamines and calcium enhance somatic embryogenesis in Coffea canephora P ex Fr

Melatonin, an underestimated natural substance with great potential for agricultural application

Neurotransmitters, neuroregulators and neurotoxins in the life of plants

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