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Adaptation of Root Function by Nutrient-Induced Plasticity of Endodermal Differentiation
Marie Barberon1, Joop Engelbertus Martinus Vermeer1, Damien De Bellis2
1Department of Plant Molecular Biology, University of Lausanne, 1015 Lausanne, Switzerland.
Cell
|January 19, 2016
Summary
Plant roots adapt to nutrient stress by regulating suberization of the endodermis, a process involving abscisic acid and ethylene. This allows roots to control nutrient uptake and maintain homeostasis.
Area of Science:
- Plant Biology
- Plant Physiology
- Molecular Biology
Background:
- Plant roots must selectively absorb essential minerals from soil, requiring specialized cellular structures.
- The plant endodermis, with its Casparian strips and suberin layer, acts as a diffusion barrier.
- Secondary endodermal differentiation into a suberized, protective layer is thought to alter absorptive function.
Purpose of the Study:
- To investigate the role of endodermal suberization in plant nutrient homeostasis.
- To determine the signaling pathways regulating suberization in response to nutrient stress.
- To explore the dynamic regulation and physiological relevance of suberization.
Main Methods:
- Analysis of suberization patterns under various nutrient stress conditions.
- Hormonal treatments using abscisic acid and ethylene.
- Assessment of suberin degradation in response to ethylene.
- Physiological measurements to link suberization changes to nutrient uptake.
Main Results:
- Endodermal suberization is induced by a broad spectrum of nutrient stresses.
- Abscisic acid and ethylene are key mediators of stress-induced suberization.
- Ethylene triggers selective degradation of suberin, indicating dynamic regulation.
- Changes in suberization are adaptive and crucial for nutrient homeostasis.
Conclusions:
- The plant endodermis dynamically regulates suberization in response to nutrient availability.
- Hormonal signaling pathways involving abscisic acid and ethylene control suberization.
- Endodermal suberization plays a critical role in maintaining root nutrient homeostasis.
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