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Spatiotemporal regulation of lateral root organogenesis in Arabidopsis by cytokinin

(2012) PLANT CELL. 24(10). p.3967-3981
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Abstract
The architecture of a plant's root system, established postembryonically, results from both coordinated root growth and lateral root branching. The plant hormones auxin and cytokinin are central endogenous signaling molecules that regulate lateral root organogenesis positively and negatively, respectively. Tight control and mutual balance of their antagonistic activities are particularly important during the early phases of lateral root organogenesis to ensure continuous lateral root initiation (LRI) and proper development of lateral root primordia (LRP). Here, we show that the early phases of lateral root organogenesis, including priming and initiation, take place in root zones with a repressed cytokinin response. Accordingly, ectopic overproduction of cytokinin in the root basal meristem most efficiently inhibits LRI. Enhanced cytokinin responses in pericycle cells between existing LRP might restrict LRI near existing LRP and, when compromised, ectopic LRI occurs. Furthermore, our results demonstrate that young LRP are more sensitive to perturbations in the cytokinin activity than are developmentally more advanced primordia. We hypothesize that the effect of cytokinin on the development of primordia possibly depends on the robustness and stability of the auxin gradient.
Keywords
INITIATION, MERISTEM, PLANT DEVELOPMENT, MASS-SPECTROMETRY, DEVELOPMENTAL WINDOW, FOUNDER CELLS, DEPENDENT AUXIN GRADIENTS, GENE-EXPRESSION, TRANSPORT, THALIANA

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Chicago
Bielach, Agnieszka, Kateřina Podlešáková, Peter Marhavy, Jérôme Duclercq, Candela Cuesta Moliner, Bruno Müller, Wim Grunewald, Petr Tarkowski, and Eva Benkova. 2012. “Spatiotemporal Regulation of Lateral Root Organogenesis in Arabidopsis by Cytokinin.” Plant Cell 24 (10): 3967–3981.
APA
Bielach, A., Podlešáková, K., Marhavy, P., Duclercq, J., Cuesta Moliner, C., Müller, B., Grunewald, W., et al. (2012). Spatiotemporal regulation of lateral root organogenesis in Arabidopsis by cytokinin. PLANT CELL, 24(10), 3967–3981.
Vancouver
1.
Bielach A, Podlešáková K, Marhavy P, Duclercq J, Cuesta Moliner C, Müller B, et al. Spatiotemporal regulation of lateral root organogenesis in Arabidopsis by cytokinin. PLANT CELL. 2012;24(10):3967–81.
MLA
Bielach, Agnieszka, Kateřina Podlešáková, Peter Marhavy, et al. “Spatiotemporal Regulation of Lateral Root Organogenesis in Arabidopsis by Cytokinin.” PLANT CELL 24.10 (2012): 3967–3981. Print.
@article{3092645,
  abstract     = {The architecture of a plant's root system, established postembryonically, results from both coordinated root growth and lateral root branching. The plant hormones auxin and cytokinin are central endogenous signaling molecules that regulate lateral root organogenesis positively and negatively, respectively. Tight control and mutual balance of their antagonistic activities are particularly important during the early phases of lateral root organogenesis to ensure continuous lateral root initiation (LRI) and proper development of lateral root primordia (LRP). Here, we show that the early phases of lateral root organogenesis, including priming and initiation, take place in root zones with a repressed cytokinin response. Accordingly, ectopic overproduction of cytokinin in the root basal meristem most efficiently inhibits LRI. Enhanced cytokinin responses in pericycle cells between existing LRP might restrict LRI near existing LRP and, when compromised, ectopic LRI occurs. Furthermore, our results demonstrate that young LRP are more sensitive to perturbations in the cytokinin activity than are developmentally more advanced primordia. We hypothesize that the effect of cytokinin on the development of primordia possibly depends on the robustness and stability of the auxin gradient.},
  author       = {Bielach, Agnieszka and Podle\v{s}{\'a}kov{\'a}, Kate\v{r}ina and Marhavy, Peter and Duclercq, J{\'e}r{\^o}me and Cuesta Moliner, Candela and M{\"u}ller, Bruno and Grunewald, Wim and Tarkowski, Petr and Benkova, Eva},
  issn         = {1040-4651},
  journal      = {PLANT CELL},
  keyword      = {INITIATION,MERISTEM,PLANT DEVELOPMENT,MASS-SPECTROMETRY,DEVELOPMENTAL WINDOW,FOUNDER CELLS,DEPENDENT AUXIN GRADIENTS,GENE-EXPRESSION,TRANSPORT,THALIANA},
  language     = {eng},
  number       = {10},
  pages        = {3967--3981},
  title        = {Spatiotemporal regulation of lateral root organogenesis in Arabidopsis by cytokinin},
  url          = {http://dx.doi.org/10.1105/tpc.112.103044},
  volume       = {24},
  year         = {2012},
}

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