Table I.
SOR/SOD activity in mature leaves from 56-d-old wild-type and transgenic Arabidopsis plants grown under continuous light for 14 d
One unit of SOR/SOD activity is defined as the amount of enzyme that inhibits the rate of reduction of cytochrome c by 50% (McCord and Fridovich, 1969). Specific activities for heat-treated (HT) samples were determined for cell extracts that were heat treated at 80°C for 15 min as described in “Materials and Methods.” Data are averages ± se of triplicate values from a single experiment.
| Sample | Specific Activity |
|---|---|
| units mg−1 | |
| Wild type | 13.32 ± 0.04 |
| SOR3 | 13.51 ± 1.21 |
| SOR9 | 14.26 ± 0.54 |
| NC906 ± P. furiosus SORa | 43.61 ± 3.76 |
| Wild type (HT) | 19.28 ± 1.66 |
| SOR3 (HT) | 48.08 ± 1.59 |
| SOR9 (HT) | 48.78 ± 1.06 |
a
Extract of E. coli strain NC906 (sod mutant) expressing P. furiosus SOR was used as a positive control.