Table II.

SOR/SOD activity in extracts of roots from 28- and 42-d-old wild-type and transgenic Arabidopsis plants

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). The activity is reported as the average of at least three values from two experiments: one using 28-d-old roots and one using 42-d-old roots. The se is indicated.

Sample	Specific Activity
	units mg−1
Wild type	273.4 ± 1.9
GFP	238.1 ± 27.7
SOR3	344.8 ± 16.5
SOR9	372.3 ± 2.7