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Adaptative response of Vitis root to anoxia
Stefano Mancuso1, Anna Maria Marras
1Laboratorio Internazionale di Neurobiologia Vegetale, Dipartimento di Ortoflorofrutticoltura, Polo Scientifico, Università di Firenze, Sesto F.no (FI), Italy. stefano.mancuso@unifi.it
Plant & Cell Physiology
|January 19, 2006
Summary
Anoxia severely impacts root cell energy, decreasing ATP and heat production. Vitis riparia tolerates anoxia better than Vitis rupestris by regulating ion permeability and electrical signals.
Area of Science:
- Plant Physiology
- Cellular Respiration
- Anoxia Tolerance
Background:
- Anoxia, the absence of oxygen, poses a significant challenge to cellular energy metabolism.
- Root cells rely on aerobic respiration for ATP production, which is disrupted under anoxic conditions.
- Understanding differential anoxia tolerance mechanisms is crucial for plant survival in waterlogged environments.
Purpose of the Study:
- To investigate the effects of anoxia on the energy economy of root cells in two Vitis species with differing anoxia tolerance.
- To compare the metabolic and ionic responses to anoxia between Vitis riparia and Vitis rupestris.
Main Methods:
- Measurement of heat production using microcalorimetry.
- Quantification of adenosine triphosphate (ATP) and ethanol production.
- Monitoring of potassium ion (K+) fluxes and electrical activity in root cells.
Main Results:
- Anoxia decreased metabolic activity and ATP levels in both Vitis species.
- Vitis rupestris exhibited a continuous decline in ATP, leading to energy deficit and cell death.
- Vitis riparia maintained ATP levels better by reducing K+ permeability and electrical signaling, avoiding severe ion imbalances.
Conclusions:
- Vitis riparia demonstrates superior anoxia tolerance compared to Vitis rupestris.
- Cellular strategies involving ion homeostasis and metabolic regulation are key to surviving anoxia in plants.
- The findings provide insights into the molecular mechanisms underlying plant anoxia tolerance.