Arabidopsis ABCG14 protein controls the acropetal translocation of root-synthesized cytokinins

Kewei Zhang, Ondrej Novak, Zhaoyang Wei, Mingyue Gou, Xuebin Zhang, Yong Yu, Huijun Yang, Yuanheng Cai, Miroslav Strnad and Chang-Jun Liu ()
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Kewei Zhang: Brookhaven National Laboratory
Ondrej Novak: Laboratory of Growth Regulators, Faculty of Science, Palacký University & Institute of Experimental Botany AS CR
Zhaoyang Wei: Brookhaven National Laboratory
Mingyue Gou: Brookhaven National Laboratory
Xuebin Zhang: Brookhaven National Laboratory
Yong Yu: St. John’s University
Huijun Yang: Brookhaven National Laboratory
Yuanheng Cai: Brookhaven National Laboratory
Miroslav Strnad: Laboratory of Growth Regulators, Faculty of Science, Palacký University & Institute of Experimental Botany AS CR
Chang-Jun Liu: Brookhaven National Laboratory

Nature Communications, 2014, vol. 5, issue 1, 1-12

Abstract: Abstract Cytokinins are a major group of phytohormones regulating plant growth, development and stress responses. However, in contrast to the well-defined polar transport of auxins, the molecular basis of cytokinin transport is poorly understood. Here we show that an ATP-binding cassette transporter in Arabidopsis, AtABCG14, is essential for the acropetal (root to shoot) translocation of the root-synthesized cytokinins. AtABCG14 is expressed primarily in the pericycle and stelar cells of roots. Knocking out AtABCG14 strongly impairs the translocation of trans-zeatin (tZ)-type cytokinins from roots to shoots, thereby affecting the plant’s growth and development. AtABCG14 localizes to the plasma membrane of transformed cells. In planta feeding of C14 or C13-labelled tZ suggests that it acts as an efflux pump and its presence in the cells directly correlates with the transport of the fed cytokinin. Therefore, AtABCG14 is a transporter likely involved in the long-distance translocation of cytokinins in planta.

Date: 2014
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DOI: 10.1038/ncomms4274

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