Investigation of The Roles of Hydrogen Peroxide and NADPH Oxidase in The Regulation of Polyamine Metabolism in Maize Plants under Drought Stress Conditions

Authors : Mehmet DEMİRALAY, Aykut SAĞLAM, Fuat YETİŞSİN, Asım KADIOĞLU

Pages : 613-625

Doi:10.15832/ankutbd.861008

View : 67 | Download : 14

Publication Date : 2022-10-17

Article Type : Research Paper

Abstract :The relationship between hydrogen peroxide and the metabolism of polyamines and the role of NADPH oxidase insert ignore into journalissuearticles values(NOX); in that relationship under drought conditions remains unclear. To reveal the relationship, expression levels of the genes in polyamine metabolism, such as arginine decarboxylase, agmatine aminohydrolase, spermidine synthase, S-adenosyl methionine decarboxylase, diamine oxidase, and polyamine oxidase were determined by RT PCR under drought stress combined with exogenous hydrogen peroxide insert ignore into journalissuearticles values(H2O2); and diphenyleneiodonium chloride insert ignore into journalissuearticles values(DPI); treatments in maize seedlings. In addition, some basic stress parameters insert ignore into journalissuearticles values(leaf water potential, lipid peroxidation);, levels of polyamines insert ignore into journalissuearticles values(putrescine, spermidine, and spermine);, and gene expression of NOX were measured under drought stress. Exogenous H2O2 induced the polyamine content by up-regulating polyamine-synthesizing genes and downregulating polyamine oxidizing genes. When the NOX enzyme was inhibited by DPI, the polyamine pathway tended towards degradation instead of production. Exogenous H2O2 regulated the metabolism of polyamines to promote their synthesis, and NOX played a key role in that regulation.
Keywords : Antioxidant enzymes, Arginine decarboxylase, Diphenyleneiodonium chloride, Polyamine oxidation, Reactive oxygen species

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