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Differences between Adenosine Triphosphatases from Monocotylous and Dicotylous Plants
Plant Physiology
|February 1, 1977
Summary
Plant mitochondrial ATPases differ between dicots and monocots. Dicot ATPases are oligomycin-sensitive and cold-labile, similar to animal and yeast enzymes, while monocot ATPases are oligomycin-insensitive and cold-stable.
Area of Science:
- Biochemistry
- Plant Biology
- Mitochondrial Physiology
Background:
- Mitochondrial ATPases are crucial for cellular energy production.
- Plant mitochondria exhibit diverse biochemical properties.
- Understanding ATPase variations can elucidate plant evolutionary divergence.
Purpose of the Study:
- To investigate and differentiate plant mitochondrial membrane-bound ATPases.
- To characterize the biochemical properties of ATPases from various plant species.
- To explore potential correlations between ATPase type and plant classification.
Main Methods:
- Isolation and purification of mitochondrial ATPases from selected plant species.
- Enzymatic assays to determine oligomycin sensitivity.
- Molecular weight determination using ultrasonication and ammonium sulfate treatment.
- Assessment of cold-lability and cold-stability of purified enzymes.
Main Results:
- Two distinct types of mitochondrial ATPases were identified across plant species.
- Dicotyledonous plants (castor bean, cauliflower, scarlet runner) exhibited oligomycin-sensitive, cold-labile ATPases with higher molecular weights.
- Monocotyledonous plants (wheat, maize, calla, onion) possessed oligomycin-insensitive, cold-stable ATPases with lower molecular weights (~45,000).
Conclusions:
- Plant mitochondrial ATPases are classified into two main types based on biochemical properties.
- These distinct ATPase types correlate with plant subclassifications: dicotyledons and monocotyledons.
- The identified differences suggest functional or regulatory variations in energy metabolism between dicot and monocot plants.
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