Table 1.
Data derived from light response curves for red versus green leaves measured during winters of 2011–2013. Data are means derived during winter at West End (WE) and Railroad (RR) field sites, using either red/blue LED as a light source, or ambient sunlight. Data include: dark respiration rate (DR), light compensation point (LCP), quantum yield efficiency (QYE), and photosynthesis under saturating irradiance (Asat). Asterisks denote statistical significance between means (±SE) of red and green leaves at each site (* p < 0.05, ** p < 0.01, *** p < 0.001, **** p < 0.0001).
| Red/Blue LED | |||||
|---|---|---|---|---|---|
| n | DR (μmol·m−2·s−1) | LCP (μmol·m−2·s−1) | QYE | Asat (μmol·m−2·s−1) | |
| Red WE | 10 | −0.603 ± 0.27 | 14.7 ± 8.9 | 0.0350 ± 0.0056 ** | 7.88 ± 1.7 ** |
| Green WE | 12 | −0.870 ± 0.39 | 15.6 ± 8.0 | 0.0442 ± 0.0076 | 11.1 ± 2.4 |
| Red RR | 9 | −0.697 ± 0.76 | 18.0 ± 20 | 0.0362 ± 0.0080 * | 11.4 ± 2.1 ** |
| Green RR | 9 | −1.03 ± 0.83 | 18.9 ± 15 | 0.0504 ± 0.013 | 16.4 ± 3.7 |
| Red AVG | 19 | −0.648 ± 0.55 | 16.3 ± 15 | 0.0356 ± 0.0067 *** | 9.53 ± 2.6 **** |
| Green AVG | 21 | −0.939 ± 0.61 | 17.0 ± 11 | 0.0469 ± 0.010 | 13.4 ± 4.0 |
| Ambient Sunlight | |||||
| Red WE | 10 | −1.12 ± 0.71 | 49.6 ± 39 | 0.0255 ± 0.0094 ** | 8.74 ± 2.4 * |
| Green WE | 9 | −1.20 ± 0.82 | 26.7 ± 23 | 0.0502 ± 0.023 | 11.0 ± 1.7 |
| Red RR | 10 | −1.04 ± 0.52 | 41.9 ± 25 | 0.0241 ± 0.0045 **** | 8.96 ± 1.4 *** |
| Green RR | 13 | −1.28 ± 0.36 | 29.8 ± 9.0 | 0.0398 ± 0.0049 | 12.4 ± 2.7 |
| Red AVG | 20 | −1.08 ± 0.60 | 45.8 ± 32 * | 0.0248 ± 0.0072 **** | 8.85 ± 1.9 **** |
| Green AVG | 22 | −1.24 ± 0.57 | 28.6 ± 16 | 0.0440 ± 0.015 | 11.8 ± 2.4 |