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• W2149308640 abstract "Cytokinin activity in plants is closely related to nitrogen availability, and an Arabidopsis gene for adenosine phosphate-isopentenyltransferase (IPT), IPT3, is regulated by inorganic nitrogen sources in a nitrate-specific manner. In this study, we have identified another regulatory system of cytokinin de novo biosynthesis in response to nitrogen status. In rice, OsIPT4, OsIPT5, OsIPT7 and OsIPT8 were up-regulated in response to exogenously applied nitrate and ammonium, with accompanying accumulation of cytokinins. Pre-treatment of roots with l-methionine sulfoximine, a potent inhibitor of glutamine synthetase, abolished the nitrate- and ammonium-dependent induction of OsIPT4 and OsIPT5, while glutamine application induced their expression. Thus, neither nitrate nor ammonium, but glutamine or a related metabolite, is essential for the induction of these IPT genes in rice. On the other hand, glutamine-dependent induction of IPT3 occurs in Arabidopsis, at least to some extent. In transgenic lines repressing the expression of OsIPT4, which is the dominant IPT in rice roots, the nitrogen-dependent increase of cytokinin in the xylem sap was significantly reduced, and seedling shoot growth was retarded despite sufficient nitrogen. We conclude that plants possess multiple regulation systems for nitrogen-dependent cytokinin biosynthesis to modulate growth in response to nitrogen availability." @default.
• W2149308640 created "2016-06-24" @default.
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• W2149308640 creator A5085426100 @default.
• W2149308640 date "2013-10-10" @default.
• W2149308640 modified "2023-10-01" @default.
• W2149308640 title "Nitrogen-Dependent Regulation of De Novo Cytokinin Biosynthesis in Rice: The Role of Glutamine Metabolism as an Additional Signal" @default.
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• W2149308640 doi "https://doi.org/10.1093/pcp/pct127" @default.
• W2149308640 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3814184" @default.
• W2149308640 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24058148" @default.
• W2149308640 hasPublicationYear "2013" @default.
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