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- W1980219199 abstract "Cytokinins (CKs), a class of plant hormones, are central regulators of plant growth and development. Based on numerous physiological and genetic studies, the quantitative regulation of cytokinin levels is the major mechanism regulating cytokinin action in diverse developmental processes. Here, we identified a different mechanism with which the physiological function of CK is modulated through side-chain modification (trans-hydroxylation). The trans-hydroxylation that forms trans-zeatin (tZ)-type CK from N6-(Δ2-isopentenyl)adenine (iP)-type CK is catalyzed by the cytochrome P450 enzymes CYP735A1 and CYP735A2 in Arabidopsis. Deficiency in trans-hydroxylation activity results in dramatic retardation of shoot growth without affecting total CK quantity, while augmentation of the activity enhances shoot growth. Application of exogenous tZ but not iP recovers the wild-type phenotype in the mutants, indicating that trans-hydroxylation modifies the physiological function of CK. We propose that the control of cytokinin function by side-chain modification is crucial for shoot growth regulation in plants." @default.
- W1980219199 created "2016-06-24" @default.
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- W1980219199 date "2013-11-01" @default.
- W1980219199 modified "2023-10-11" @default.
- W1980219199 title "Side-Chain Modification of Cytokinins Controls Shoot Growth in Arabidopsis" @default.
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- W1980219199 doi "https://doi.org/10.1016/j.devcel.2013.10.004" @default.
- W1980219199 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24286826" @default.
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