1. Cyclic programmed cell death stimulates hormone signaling and root development in Arabidopsis.
- Author
-
Xuan W, Band LR, Kumpf RP, Van Damme D, Parizot B, De Rop G, Opdenacker D, Möller BK, Skorzinski N, Njo MF, De Rybel B, Audenaert D, Nowack MK, Vanneste S, and Beeckman T
- Subjects
- Arabidopsis cytology, Arabidopsis metabolism, Plant Epidermis cytology, Plant Epidermis growth & development, Plant Epidermis metabolism, Plant Root Cap cytology, Plant Root Cap metabolism, Receptors, TNF-Related Apoptosis-Inducing Ligand genetics, Receptors, TNF-Related Apoptosis-Inducing Ligand metabolism, Signal Transduction, Soil, Water metabolism, Apoptosis, Arabidopsis growth & development, Indoleacetic Acids metabolism, Plant Root Cap growth & development
- Abstract
The plant root cap, surrounding the very tip of the growing root, perceives and transmits environmental signals to the inner root tissues. In Arabidopsis thaliana, auxin released by the root cap contributes to the regular spacing of lateral organs along the primary root axis. Here, we show that the periodicity of lateral organ induction is driven by recurrent programmed cell death at the most distal edge of the root cap. We suggest that synchronous bursts of cell death in lateral root cap cells release pulses of auxin to surrounding root tissues, establishing the pattern for lateral root formation. The dynamics of root cap turnover may therefore coordinate primary root growth with root branching in order to optimize the uptake of water and nutrients from the soil., (Copyright © 2016, American Association for the Advancement of Science.)
- Published
- 2016
- Full Text
- View/download PDF