Table I. Basic photosynthetic parameters and chlorophyll content of wild-type (Col-0), pam48-1 (mterf6-1), and 35S:PAM48.1 pam48-1 (35S:mTERF6.1 mterf6-1) plants at the eight-leaf rosette stage.
Photosynthetic parameters are derived from measurements on at least five leaves from different plants. Actinic light intensity was 95 µE m−2 s−1. Acetone-extracted leaf pigments were measured photometrically, and chlorophyll concentrations were calculated according to Lichtenthaler (1987) and are reported in μg mg−1 fresh weight. Mean values ± sd are provided.
| Parameter | Col-0 | mterf6-1 | 35S:mTERF6.1 mterf6-1 |
|---|---|---|---|
| Fv/Fm | 0.81 ± 0.01 | 0.54 ± 0.03a | 0.82 ± 0.01 |
| ΦII | 0.70 ± 0.03 | 0.43 ± 0.02a | 0.69 ± 0.04 |
| Nonphotochemical quenching | 0.14 ± 0.03 | 0.11 ± 0.04a | 0.16 ± 0.02 |
| 1-qP | 0.11 ± 0.03 | 0.57 ± 0.04a | 0.14 ± 0.03 |
| Chlorophyll a + b | 1.15 ± 0.09 | 0.81 ± 0.17a | 1.12 ± 0.13 |
| Chlorophyll a/b | 3.01 ± 0.03 | 2.75 ± 0.12 | 3.05 ± 0.06 |
a
Values significantly different from Col-0 (P < 0.05).