Diurnal and Seasonal Changes in Melatonin Content and Its Effect on Ageing in Plants
2021
Karaca, Aygul | Koklu, Sebnem | Korkmaz, Ahmet
Melatonin (N-acetyl-5-methoxytryptamine) is an indolamine which was first isolated from bovine pineal gland in 1958 and since its discovery, it’s been identified in almost all life forms. In addition to being regarded as a phytohormone recently, it is known as a broad spectrum antioxidant due to its ability to remove reactive oxygen and nitrogen species from the environment. Extensive research demonstrated that this molecule, which is stated to act as a photoperiodic regulator or 24-hour rhythm regulator in plants, controls the daily and annual rhythm in animals and humans as well. In addition, studies have shown that although the tissue melatonin content varies from species to species, its concentration is known to increase especially at night or in the dark, and in some plants it peaks twice a day. The role of melatonin in the ageing metabolism of plants or seeds has not been completely demonstrated. However, latest research has shown that the positive effect of melatonin on aging is closely related to the effect of phytohormones that regulate or delay aging. This review mainly focuses on diurnal and seasonal change in melatonin content of plant tissues and its effect on aging.
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