Table 3. Effects of elevated [CO2] on chloroplast feature of I. indigotica.
| Growth [CO2] | Number of starch grains per chloroplast profile | Area per starch grain (µm2) |
| ambient | 1.5±0.29 | 0.74±0.08 |
| FACE | 3.75±0.48 | 1.81±0.12 |
| increase | 150.0% | 144.3% |
| P value | 0.01 | 0.00 |
Values are means ± standard error from three plants. Number of starch grains per chloroplast profile was determined from 50 chloroplasts. Area per starch grain was determined from 50 starch grains. The statistical significance level for the effects of [CO2] treatment was tested.