Table II.
Photosynthetic measurements of wild-type, ppl1, and ppl2 plants
Data presented are means ± sd of three to six independent measurements.
| Photosynthetic Parameters | Wild Type | ppl1 | ppl2 |
|---|---|---|---|
| Fv/Fma | 0.785 ± 0.015 | 0.781 ± 0.014 | 0.786 ± 0.013 |
| ΦPSIIb | 0.671 ± 0.023 | 0.641 ± 0.023 | 0.613 ± 0.015* |
| Far-red oxidizable P700c | 1.00 ± 0.04 | 0.99 ± 0.03 | 0.97 ± 0.01 |
| Chl a/b ratio | 2.97 ± 0.14 | 2.99 ± 0.11 | 2.98 ± 0.12 |
| O2 evolutiond | |||
| (Maximum)e | 246 ± 14 | 213 ± 2* | 261 ± 18 |
| (Average)f | 168 ± 8 (68)g | 143 ± 6 (67)* | 182 ± 7 (70) |
a
Fv/Fm value was measured after incubation in the dark for 1 h.
b
ΦPSII was measured under illumination at 144 μmol quanta m−2 s−1.
c
Relative value to wild-type plants set as 1.00.
d
O2 evolution activity was indicated by μmol O2 [mg chl]−1 h−1.
e
Maximal activity of the O2 evolution from isolated thylakiod membranes.
f
Average activity of the O2 evolution during the first 5 min.
g
Figures in parentheses are relative % of the average to the maximal activity. Asterisks indicate the means that were statistically different from that of wild type (P < 0.05; Student's t test).