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Plant and Cell Physiology Advance Access originally published online on July 18, 2006
Plant and Cell Physiology 2006 47(8):1112-1123; doi:10.1093/pcp/pcj082
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© The Author 2006. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Cytokinin-Mediated Cell Cycling Arrest of Pericycle Founder Cells in Lateral Root Initiation of Arabidopsis

Xiang Li, Xiaorong Mo, Huixia Shou and Ping Wu*

State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zi Jin Gang Campus, Zhejiang University, Hangzhou, 310058, PR China

* Corresponding author: E-mail, clspwu{at}zju.edu.cn; Fax, +86-571-88206412.

In Arabidopsis, lateral root formation is a post-embryonic developmental event, which is regulated by hormones and environmental signals. In this study, via analyzing the expression of cyclin genes during lateral root (LR) formation, we report that cytokinins (CTKs) inhibit the initiation of LR through blocking the pericycle founder cells cycling at the G2 to M transition phase, while the promotion by CTK of LR elongation is due to the stimulation of the G1 to S transition. No significant difference was detected in the inhibitory effect of CTK on LR formation between wild-type plants and mutants defective in auxin response or transport. In addition, exogenously applied auxin at different concentrations could not rescue the CTK-mediated inhibition of LR initiation. Our data suggest that CTK and auxin might control LR initiation through two separate signaling pathways in Arabidopsis. The CTK-mediated repression of LR initiation is transmitted through the two-component signal system and mediated by the receptor CRE1.

(Received April 19, 2006; Accepted June 25, 2006)
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