Differential temperature sensitivity of pea superoxide dismutases |
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Authors: | Burke J J Oliver M J |
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Institution: | U.S. Department of Agriculture-Agricultural Research Service Cropping Systems Research Laboratory, Route 3, Box 215, Lubbock, Texas 79401. |
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Abstract: | The activity of pea (Pisum sativum L.) Cu/Zn and Mn superoxide dismutase isoforms was evaluated across a range of temperatures from 10 to 45°C. Maximal activity of the Cu/Zn and Mn superoxide dismutase isoforms was observed at 10°C. Both cytoplasmic and chloroplast Cu/Zn superoxide dismutases exhibit a reduction in staining intensity with increasing temperatures. Mn superoxide dismutase, however, maintained a relatively constant staining intensity across the range of temperatures evaluated. An unrelated enzyme used as a control, malate dehydrogenase, exhibited the expected increase in staining activity with increasing temperatures. These results describe a unique response of a protection enzyme to temperature. |
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