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- Title
Cytokinin-Mediated Cell Cycling Arrest of Pericycle Founder Cells in Lateral Root Initiation of Arabidopsis.
- Authors
Xiang Li; Xiaorong Mo; Huixia Shou; Ping Wu
- 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 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.
- Subjects
ARABIDOPSIS; PLANT hormones; CYTOKININS; CELL receptors; INHIBITORY Concentration 50
- Publication
Plant & Cell Physiology, 2006, Vol 47, Issue 8, p1112
- ISSN
0032-0781
- Publication type
Article
- DOI
10.1093/pcp/pcj082