Table I.
Pigment composition of thylakoid membranes isolated from dark-adapted sun and shade leaves of I. sapindoides
The maximal PSII efficiency (Fv/Fm) was measured in dark-adapted leaves (n = 8–11, ±sd). Some of the shade leaves were exposed to a light intensity of approximately 200 μmol m−2 s−1 for 30 min to induce xanthophyll deepoxidation (shadeL) before dark adaptation. Concentrations of carotenoid pigments are given on a Chl basis (mmol mol−1 Chl a + b). None of the samples contained detectable levels of Z or A. For pigments, n = 3 (±sd).
| Fv/Fm | Chl a/b | N | V | Lx | L | Lx + L | Lx/L | α-Car | β-Car | α + β-Car | α/β-Car | Total | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Shade | 0.79 | 2.6 | 58.0 | 25.1 | 67.9 | 82.1 | 150.0 | 0.83 | 58.5 | 37.0 | 95.4 | 1.58 | 328.6 |
| (0.01) | (0.1) | (0.9) | (0.4) | (1.2) | (4.9) | (5.1) | (0.05) | (0.9) | (5.1) | (5.2) | (0.22) | (7.3) | |
| ShadeL | 0.68 | 2.7 | 53.5 | 20.9 | 26.0 | 106.5 | 132.5 | 0.24 | 53.0 | 38.5 | 91.5 | 1.38 | 298.3 |
| (0.09) | (0.1) | (0.6) | (0.8) | (2.6) | (2.9) | (3.9) | (0.03) | (1.1) | (1.1) | (1.6) | (0.05) | (4.3) | |
| Sun | 0.78 | 3.2 | 49.2 | 32.7 | 25.3 | 87.1 | 112.4 | 0.29 | 48.6 | 53.0 | 101.6 | 0.92 | 295.9 |
| (0.01) | (0.1) | (0.9) | (1.6) | (0.9) | (3.1) | (3.3) | (0.01) | (4.3) | (2.5) | (5.0) | (0.09) | (6.3) |