Journal
PLANT AND CELL PHYSIOLOGY
Volume 47, Issue 8, Pages 1112-1123Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pcj082
Keywords
Arabidopsis; cell cycle; cytokinin; lateral root initiation
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In Arabidopsis, lateral root formation is a postembryonic 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 G(2) to M transition phase, while the promotion by CTK of LR elongation is due to the stimulation of the G(1) 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 Arahidopsis. The CTK-mediated repression of LR initiation is transmitted through the two-component signal system and mediated by the receptor CRE1.
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