Table 4.
Increase in the daily canopy carbon assimilation (DCA) by optimized photosynthetic nitrogen distribution or partitioning under various daily photosynthetic photon integrals (DPI, mol photons m−2 d−1) for canopies grown under different conditions
| Growth condition | Light level | Control DCA | Increase in DCA (%) by optimized | ||
|---|---|---|---|---|---|
| aDPI level (%) | DPI | (mol CO2 d−1) | Distribution | Partitioning | |
| HN+HL | 200 | 42.7 | 0.5467 | <5% | 6.3% |
| 100 | 21.4 | 0.3217 | <5% | <5% | |
| 50 | 10.7 | 0.1368 | <5% | 7.1% | |
| HN+LL | 200 | 17.1 | 0.2554 | <5% | <5% |
| 100 | 8.5 | 0.1195 | <5% | <5% | |
| 50 | 4.3 | 0.0259 | <5% | 23.6% | |
| LN+HL | 200 | 42.7 | 0.4011 | 7.0% | 12.7% |
| 100 | 21.4 | 0.2653 | <5% | <5% | |
| 50 | 10.7 | 0.1221 | <5% | <5% | |
| LN+LL | 200 | 17.1 | 0.2261 | 6.9% | <5% |
| 100 | 8.5 | 0.1108 | <5% | <5% | |
| 50 | 4.3 | 0.0215 | <5% | 25.0% |
Average DPI during acclimation (100% aDPI), 200% and 50% aDPI were tested. The increase in DCA for plants grown under the combinations of high nitrogen (HN), high light (HL), low nitrogen (LN), and low light (LL) was calculated by comparing the DCA between optimal and control distribution or partitioning.