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

Reference ID

11086

Title

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

Source

J Plant Res, 2003, vol. 116, pp. 241-252

Authors (4)

Schmulling-T	Werner-T
Riefler-M	Krupkova-E

Abstract

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.