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Plant and Cell Physiology Advance Access published online on July 18, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj082
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© The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received April 19, 2006
Accepted June 25, 2006

Regular Paper

Cytokinin-mediated cell cycling arrest of pericycle founder cells in lateral root initiation of Arabidopsis

Xiang Li 1, Xiaorong Mo 1, Huixia Shou 1, and Ping Wu 1 *

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

* To whom correspondence should be addressed.
Ping Wu, E-mail: clspwu{at}zju.edu.cn


  Abstract

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 roots (LRs) 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 of CTK on LR elongation is due to the stimulation of G1-to-S transition. No significant difference was detected in the inhibition effect of CTK on LR formation between wild type plants and the mutants defective in auxin response or transport. In addition, exogenous applied auxin with different concentrations could not rescue the CTK-mediated inhibition of LR initiation. Our data suggests that CTK and auxin might control the LR initiation through two separate signal pathways in Arabidopsis. The CTK-mediated repression of LR initiation is transmitted through the two-component signal system and mediated by receptor CRE1.

Keywords: Arabidopsis; cell cycle; cytokinin; lateral root initiation.
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