Table III.
Activity of PSII and PSI and the rate of uncoupled linear electron transport in WT, petc-2, and atpd-1 thylakoids
Values of average oxygen evolution (PSII activity and linear electron transport) or consumption (PSI activity; ±SD) in micromoles of O2 per milligram of Chl per hour were derived from three independent measurements of thylakoids equivalent to 10 μg of Chl per milliliter. The relative values for the two mutant genotypes, provided in columns 4 and 6, reflect the ratio of activity between the mutant and WT from the same amount of fresh weight tissue. Because average rates of oxygen evolution/consumption of thylakoids from WT plants of both ecotypes, Col-0 and Ler, were very similar, only Col-0 values are shown.
| Parameter | WT | petc-2 | Relative Level in petc-2 | atpd-1 | Relative level in atpd-1 |
|---|---|---|---|---|---|
| % | % | ||||
| PSII activity | 134 ± 7 | 12 ± 0 | 3.9 | 84 ± 7 | 28 |
| PSI activity | 151 ± 7 | 251 ± 8 | 73 | 88 ± 7 | 26 |
| Linear electron transport (uncoupled) | 84 ± 7 | 0 ± 0 | 0 | 54 ± 2 | 29 |