Academia.edu no longer supports Internet Explorer.
To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser.
…
5 pages
1 file
of Cd-induced growth improvement by exogenous melatonin pre-treatment in Abutilon theophrasti Medicus, E3S Web Conferences 293, 01010 (2021) ,
Journal of Pineal Research, 2005
Melatonin regulates the growth of roots, shoots, and explants, to activate seed germination and rhizogenesis and to delay induced leaf senescence. The antioxidant properties of melatonin would seem to explain, at least partially, its ability to fortify plants subjected to abiotic stress. In this Review we examine recent data on the gene-regulation capacity of melatonin that point to many interesting features, such as the upregulation of anti-stress genes and recent aspects of the auxin-independent effects of melatonin as a plant growth regulator. This, together with the recent data on endogenous melatonin biosynthesis induction by environmental factors, makes melatonin an interesting candidate for use as a natural biostimulating treatment for field crops.
Asian-Australasian journal of animal sciences, 2012
We have investigated the effect of melatonin (MLT) on specific growth rate (SGR% day(-1)), condition factor (k), gonado-somatic-index (GSI), histological structures of gonads, serum as well as gonadal protein and lipid in Nile tilapia Oreochromis niloticus. MLT treatment in the dose of 25 μg/L for three weeks reduced SGR% day(-1) (0.9±0.04) as compared to control (1.23±0.026). The GSI value was significantly (p<0.05) reduced to 1.77±0.253 from control where it was 2.56±0.25. Serum protein level increased from 9.33±2.90 mg/ml (control) to 11.67±1.45 mg/ml after MLT treatment while there was depressed serum triglycerides (86.16±1.078 mg/dl) and cholesterol (126.66±0.88 mg/dl) as compared to control values where these were 123.0±1.23 mg/dl and 132.0±1.65 mg/dl respectively. Histological structure of ovary showed small eggs of early perinucleolus stage after MLT treatment while testicular structure of control and MLT treated fish was more or less similar. It is concluded that exogeno...
Planta, 2004
Melatonin (N-acetyl-5-methoxi-tryptamine), a well-known animal hormone synthetised by the pineal gland, plays a key role in the circadian rhythm of vertebrates. An exhaustive bibliographical revision of studies on melatonin in plants published since 1990 points to very few studies (around 20), of which only 8 have a clear plant physiological focus. The data presented in this study demonstrate that melatonin plays a physiological role in plant tissues. Melatonin is seen to be a molecule that promotes vegetative growth in etiolated Lupinus albus L. hypocotyls, in a similar way to IAA. The measurements of melatonin and IAA in lupin hypocotyls by high-performance liquid chromatography with electrochemical detection, and their identification by tandem mass spectrometry, point to a different distribution of these molecules in etiolated hypocotyls.
Journal of Pineal Research, 2009
Int. J. Mol. Sci., 2020
The gilthead seabream larval rearing in continuous light is common in most Mediterranean hatcheries to stimulate larval length growth and increase food consumption. Several studies have shown that continuous light affects larval development and increases the prevalence of skeletal deformities. Melatonin is a crucial pineal neurohormone that displays daily secretion patterns, stimulates cell proliferation and embryonic development in Atlantic salmon and zebrafish, and improves osseointegration in mice and humans. However, no studies have examined the effects of orally supplemented melatonin on skeletal deformities in Sparus aurata larvae. We administered exogenous melatonin to gilthead seabream larvae via enriched rotifers and nauplii of Artemia. Exogenous melatonin induced bone deformities and stimulated parathyroid hormone-related protein-coding gene (PTHrP) mRNA expression. In addition to the melatonin-induced PTHrP high expression level, the recorded non coordinated function of s...
General and Comparative Endocrinology, 1991
This study examined the effects of photoperiod and three different dosages of melatonin on the rate of metamorphosis and weight gain in Xenopus laevis. Exposure of larvae to 23L: 1D resulted in lower mean body weight and a retarded metamorphic rate in comparison to larvae exposed to lL:23D. Larvae reared in either photoperiod and treated with exogenous melatonin demonstrated a dose-dependent suppression of weight attained, with short photoperiod larvae showing a more dramatic effect. Analysis of growth patterns indicate that photoperiod and exogenous melatonin have a greater effect on weights prior to Nieuwkoop and Faber stage 56 in the development of Xenopus. Larvae exposed to lL:23D and exogenous melatonin metamorphosed at an accelerated rate when compared to larvae exposed to 23L:lD and the same dosages of melatonin. In both photoperiod regimens an exogenous melatonin concentration of 45 (*g/100 ml resulted in an accelerated metamorphic rate, whereas 225 and 450 (~g/100 ml retarded metamorphic rate of larvae in comparison to COtWOk.
Plant Physiology and Biochemistry, 2015
Since the discovery of melatonin in plants, several roles have been described for different species, organs, and developmental stages. Arabidopsis thaliana, being a model plant species, is adequate to contribute to the elucidation of the role of melatonin in plants. In this work, melatonin was monitored daily by UHPLC-MS/MS in leaves, in order to study its diurnal accumulation as well as the effects of natural and artificial light treatments on its concentration. Furthermore, the effects of exogenous application of melatonin to assess its role in seed viability after heat stress and as a regulator of growth and development of vegetative tissues were evaluated. Our results indicate that melatonin contents in Arabidopsis were higher in plants growing under natural radiation when compared to those growing under artificial conditions, and its levels were not diurnally-regulated. Exogenous melatonin applications prolonged seed viability after heat stress conditions. In addition, melatonin applications retarded leaf senescence. Its effects as growth promoter were dose and tissueedependent; stimulating root growth at low concentrations and decreasing leaf area at high doses.
Journal of Pineal Research, 1998
Rose MF, Rose SR. Melatonin accelerates metamorphosis in Xenopus luevis. J. Pineal Res. 1998; 24:90-95. 0 Munksgaard, Copenhagen Abstract: Delayed metamorphosis associated with large body size has been observed in Woodhousei fowleri tadpoles reared in continuous dark (DD). To evaluate the mechanism by which DD delayed metamorphosis, lightcycle exposure was controlled and thyroxine (T4), melatonin, or drugs that alter prolactin (Prl) concentrations were given to Xenopus luevis tadpoles. It was hypothesized that exogenous melatonin would delay metamorphosis and increase body size, and that elevation of Prl concentrations would have effects similar to melatonin exposure. Xenopus luevis tadpoles were randomized to three light conditions [light/dark (LD, 12 h/12 h), DD, and continuous light (LL)] and subgroups in each light condition were treated with T4, melatonin, bromocriptine (Bro), haloperidol (Hal), or no drug. Each subgroup included 12 tadpoles. Drugs were administered in the water either continuously or daily from 07.00 to 19.00 h (Intermittent). Measurements of total length, leg length, and stage of metamorphosis were obtained at regular intervals. DD resulted in delayed metamorphosis, while LL did not. T4 accelerated metamorphosis as expected, countering the delaying effects of DD. In contrast to the hypothesis, melatonin accelerated metamorphosis and impaired body size compared to controls. Intermittent Hal also accelerated metamorphosis, while Bro delayed it. In DD, both T4 and melatonin led to increased tadpole size in contrast to their counterparts in LD or LL. Delayed metamorphosis in DD is not caused by increased melatonin production. Melatonin and Hal (as given in this study) accelerate metamorphosis. Melatonin acceleration of metamorphosis may occur through alteration of the concentration of prolactin.
General and Comparative Endocrinology, 2013
A widespread occurrence of melatonin (Mel) in plant kingdom has been recently reported. Mel-till now known as an animal hormon and neurotransmiter-seems to be a highly conserved molecule occurring in evolutionary distant organisms. Its role in plants seems to be similar in some aspects to that in animals. Although Mel function in plants is not well known yet a hypothesis can be put forward that it probably acts as a ºnight signal, coordinating responses to diurnal and photoperiodic environmental cues. It has also been suggested that Mel is an independent plant growth regulator, probably its action is analogous to indole-3-acetic acid (IAA) and it may mediate the activities of other plant growth regulators. Due to its antioxidant properties Mel may also stabilise cell redox status and protect tissues against reactive oxygen species (ROS) and other harmful environmental influence. Some researchers speculate that Mel could also be used to improve the phytoremediation efficiency of plants against different pollutants.We have suggested that exogenous Mel applied into the seed could be a good biostimulator improving seed germination and seedling growth in abiotic stress conditions. Since Mel is safe to animals and humans as well as inexpensive, this technique could be a good, feasible and cost-effective tool for positive seed quality modification and may have economically important meaning for ecological agriculture.
El Estado Libre de Cospaia: En el alto valle del Tíber, 1892
Alphabet Scribes in the Land of Cuneiform: Sēpiru Professional in Mesopotamia in the Neo-Babylonian and Achaemenid Periods., 2018
Journal of Learning Disabilities, 1993
Pablo Sánchez León, Carla Vieira e Nina Vieira (eds.), Espelhos de Mercúrio. A representaçâo do comércio nas monarquías ibéricas, 1500-1800, Coimbra, Universidade de Coimbra, 2024, pp. 9-26., 2024
International Journal of Computer Science and Mobile Computing (IJCSMC), 2023
International Journal of Industrial and Systems Engineering
Journal of Hospitality and Tourism Technology, 2017
Semi di Sapienza "Margine e marginalità: un'analisi multidisciplinare delle figure e dei contesti", 2023
Acta Alimentaria, 1999
Journal of anesthesia & intensive care medicine, 2023
Free Radical Biology and Medicine, 1998
Arctic Review on Law and Politics, 2023
Informe Epidemiológico do Sus, 2002
Талдамалық баяндама: «Балалардың әл-ауқаты Индексі жүйесін зерттеу: монито- ринг және Қазақстандағы балалардың өмір сүру сапасын арттыру» (2 том) / Абишева Г.А., Отар Э.С., Таипова М.К., Мурзалинова А.Ж., Сарсекеева А.М., Сатанов А.Б., Сакенова Е.Н., Балғабаева Г.К., Маликов Б.Ж., Сыздыкова Г.И..., 2024
Journal of Health Population and Nutrition, 2006
Archives of Dermatological Research, 2000
Journal of Clinical Medicine