Table 2.
Pigment contents of various regions of 7-d-old sunflower (Helianthus annuus) cotyledons grown in the light (20 µmol s−1 m−2, at 12/12 h day/night cycles) and of dark-grown cotyledons
| Chlorophyll a (μg g−1 f · wt) | Chlorophyll b (μg g−1 f · wt) | Chl a : Chl b ratio | Protochlorophyll(ide) μg g−1 f · wt | |
|---|---|---|---|---|
| Region exposed to light- | 477·4 ± 30·7 | 205·3 ± 21·6 | 2·3 | – |
| Covered region | 65·7 ± 6·3 | 20·1 ± 3·5 | 3·3 | 2·1 ± 0·4 |
| Etiolated cotyledon | – | – | – | 6·8 ± 0·5 |
The pigment contents were calculated from absorption and fluorescence measurements (n = 6).