Abstract— The investigation was carried out to find out whether enhanced UVB radiation increases the synthesis of secondary metabolites in some plants grown under tropical region. Like tropical plant temperate plant also grown successfully in the tropical region. Tropical plants are thought to have an inherent resistance to abiotic stress. The abiotic stress that enhances the ability of the plant by increasing the content of the secondary bioactive components. While the plants exposed to enhanced UVB radiation in the field condition, the synthesis of secondary pigments like flavonoids and anthocyanin level varied among species. In radish and beet- root the synthesis of flavonoid and anthocyanin the content was increased, whereas, in the onion and carrot, the level of synthesis of secondary pigment was less. But compared to ambient plants the UVB the irradiated the plant has more secondary pigment. So it proves that the UVB radiation increases the synthesis of secondary pigment content by activating the defence mechanism and to protect plants against UVB damage.
Keywords— Anthocyanin, UV-B radiation, Carrot, Radish, Beetroot, Onion, Seconary pigment.
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