SA Being a Constituent of Plants Is Consumed by Herbivore Animals as Well as Humans

1416 WordsFeb 16, 20186 Pages
SA being a constituent of plants is consumed by herbivores animals as well as humans Introduction (Explain what are salicylates, its origin and importance in plants) Salicylic acid (SA) is a Mono-hydroxy benzoic acid derived from the metabolism of Salicin, an alcoholic beta-glucoside known for its anti-inflammatory properties isolated from willow bark tree. Salicylic acid has well identified roles in plant growth, physiology and disease resistance. In plants, Salicylic acid is important in the establishment of both local and systemic acquired resistance (SAR) analogous to innate immunity in animals. It helps in accumulation of pathogenesis-related (PR) proteins. Blocking SA accumulation by expressing Salicylate hydroxylase which causes its degradation prevent induction of PR genes. When some parts of a plant gets infected with viruses like Tobacco Mosaic Virus (TMV), locally produced SA sends signal to all other regions to get ready for a potential infection. Methyl Salicylate is one of the important signal for SAR derived from SA, which is not present in plant but is synthesized upon pathogen infection. SA in cell is converted to methyl salicylate by an SA carboxyl methyltransferase and this volatile derivative is an important long distance signal. Methyl Salicylate is then recognized by Salicylic acid binding protein 2 (SABP2) enzyme, which exhibits 150 times more affinity to SA than catalase which helps in conversion of hydrogen peroxide to water and oxygen. When SA

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