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Redox activity at the surface of oat root cells
B Rubinstein1, A I Stern, R G Stout
1Department of Botany, University of Massachusetts, Amherst, Massachusetts 01003.
Plant Physiology
|October 1, 1984
Summary
Cell surface electron transport in oat roots involves plasma membrane redox systems. Multiple electron transport systems were identified at the plasma membrane, indicating complex root cell functions.
Area of Science:
- Plant Physiology
- Biochemistry
- Cell Biology
Background:
- Cell surface electron transport is crucial for various plant processes.
- The plasma membrane plays a key role in cellular redox reactions.
Purpose of the Study:
- To investigate cell surface electron transport in intact oat seedlings.
- To characterize the redox activities at the plasma membrane of Avena sativa roots.
Main Methods:
- Measuring oxidation/reduction of agents in the root-bathing medium.
- Assessing NADH oxidation and ferricyanide reduction.
- Analyzing plasma membrane-enriched preparations from Avena roots.
Main Results:
- Detected NADH oxidation and ferricyanide reduction, indicating cell surface electron transport.
- Confirmed activities are due to plasma membrane electron transfer, not reagent uptake or leakage.
- Identified NADH-ferricyanide oxidoreductase activity in plasma membrane preparations.
- Evidence suggests multiple electron transport systems at the plasma membrane based on redox responses.
Conclusions:
- Oat root plasma membranes possess active electron transport systems.
- Multiple redox systems likely contribute to cellular functions at the plasma membrane.
- These findings advance understanding of plant root cell physiology and bioenergetics.
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