Structure and function of cytokinin oxidase/dehydrogenase genes of maize, rice, Arabidopsis and other species

被引:339
作者
Schmülling, T [1 ]
Werner, T [1 ]
Riefler, M [1 ]
Krupková, E [1 ]
Bartrina y Manns, I [1 ]
机构
[1] Free Univ Berlin, Inst Biol Appl Genet, D-14195 Berlin, Germany
关键词
Arabidopsis thaliana; cytokinin dehydrogenase; cytokinin oxidase; plant hormones; rice; Zea mays;
D O I
10.1007/s10265-003-0096-4
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Cytokinin oxidases/dehydrogenases (CKX) catalyze the irreversible degradation of the cytokinins isopentenyladenine, zeatin, and their ribosides in a single enzymatic step by oxidative side chain cleavage. To date the sequences of 17 fully annotated CKX genes are known, including two prokaryotic genes. The CKX gene families of Arabidopsis thaliana and rice comprise seven and at least ten members, respectively. The main features of CKX genes and proteins are summarized in this review. Individual proteins differ in their catalytic properties, their subcellular localization and their expression domains. The evolutionary development of cytokinin-catabolizing gene families and the individual properties of their members indicate an important role for the fine-tuned control of catabolism to assure proper regulation of cytokinin functions. The use of CKX genes as a tool in studies of cytokinin biology and biotechnological applications is discussed.
引用
收藏
页码:241 / 252
页数:12
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