Table I.
Summary of 14C partitioning in the total sugar and starch pools after a 2-h feeding under ambient (35 Pa) and high (90 Pa) CO2 and comparison with export
| Plant | Ambient
CO2
|
High CO2
|
||||||
|---|---|---|---|---|---|---|---|---|
| Sugars | Starch | Ratio | Exporta | Sugars | Starch | Ratio | Export | |
| mmol C m−2 | mmol C m−2 | |||||||
| C4 Dicots | ||||||||
| Pigweed | 31.0 ± 3.6 | 13.0 ± 2.2 | 2.4 | 29.5 ± 2.2 | 17.3 ± 2.3 | 1.7 | ||
| Gomphrena | 36.0 ± 4.3 | 11.5 ± 1.4 | 3.1 | 45.4 ± 5.8 | 11.5 ± 0.7 | 3.9 | ||
| Average | 2.8 | 15.8 (69%) | 2.8 | 14.2 (67%) | ||||
| C4 Monocots | ||||||||
| Maize | 41.8 ± 1.4 | 9.4 ± 1.4 | 4.5 | 50.4 ± 4.3 | 16.6 ± 2.2 | 3.0 | ||
| Sorghum | 33.1 ± 4.3 | 10.8 ± 0.7 | 3.1 | 23.0 ± 0.7 | 10.1 ± 0.7 | 2.3 | ||
| Average | 3.8 | 19.8 (77%) | 2.7 | 22.9 (79%) | ||||
| Average of all C4 | 3.3 | 17.8 (73%) | 2.8 | 18.6 (73%) | ||||
| C3 Dicots | ||||||||
| Subgroup 1 | ||||||||
| Celery | 1.4 ± 0.0 | 4.3 ± 0.7 | 0.3 | 2.9 ± 0.0 | 21.6 ± 5.0 | 0.1 | ||
| Catnip | 23.0 ± 0.7 | 12.9 ± 0.7 | 1.8 | 49.7 ± 5.8 | 20.9 ± 2.2 | 2.4 | ||
| Coleus | 7.9 ± 0.7 | 10.8 ± 0.7 | 0.7 | 12.2 ± 0.7 | 17.3 ± 2.9 | 0.7 | ||
| Cucumber | 17.3 ± 0.7 | 23.0 ± 1.4 | 0.8 | 21.6 ± 0.7 | 30.9 ± 0.7 | 0.7 | ||
| Salvia | 13.0 ± 0.7 | 5.0 ± 0.7 | 2.6 | 35.3 ± 2.9 | 21.6 ± 1.4 | 1.6 | ||
| Sunflower | 17.3 ± 1.4 | 7.2 ± 0.7 | 2.4 | 38.2 ± 5.8 | 14.4 ± 4.0 | 2.7 | ||
| Average | 1.4 | 8.9 (72%) | 1.4 | 13.1 (68%) | ||||
| Subgroup 2 | ||||||||
| Chrysanthemum | 18.7 ± 2.2 | 7.9 ± 0.7 | 2.4 | 48.2 ± 3.6 | 13.7 ± 1.4 | 3.5 | ||
| Pepper | 29.5 ± 1.4 | 33.1 ± 5.0 | 0.9 | 51.8 ± 0.7 | 61.9 ± 17 | 0.8 | ||
| Tobacco | 30.2 ± 2.9 | 27.4 ± 3.6 | 1.1 | 47.5 ± 4.3 | 43.2 ± 5.8 | 1.1 | ||
| Bean | 27.4 ± 2.2 | 21.6 ± 3.6 | 1.3 | NAb | NA | NA | ||
| Pea | 66.9 ± 3.6 | 10.8 ± 0.7 | 6.2 | 102 ± 6.5 | 17.3 ± 1.4 | 5.9 | ||
| Rose | 36.0 ± 2.9 | 5.8 ± 0.7 | 6.3 | 51.1 ± 3.6 | 15.1 ± 0.7 | 3.4 | ||
| Average | 3.0 | 5.8 (44%) | 2.9 | 9.1 (42%) | ||||
| C3 Monocots | ||||||||
| Alstroemeria | 42.4 ± 2.5 | 5.8 ± 1.2 | 7.3 | 83.7 ± 5.1 | 36.1 ± 2.6 | 2.3 | ||
| Sandersonia | 43.7 ± 0.6 | 6.5 ± 0.6 | 6.7 | NA | NA | NA | ||
| Barley | 54.7 ± 6.4 | 7.9 ± 0.7 | 6.9 | 101 ± 16 | 11.5 ± 1.4 | 8.8 | ||
| Oat | 77.0 ± 2.9 | 5.0 ± 0.7 | 15.3 | 148 ± 7.0 | 11.5 ± 0.7 | 12.9 | ||
| Wheat | 61.9 ± 12 | 7.2 ± 0.7 | 8.6 | 133 ± 9.0 | 20.2 ± 2.2 | 6.6 | ||
| Average | 9.0 | 3.7 (29%) | 7.7 | 8.5 (33%) | ||||
| Average of all C3 | 4.5 | 6.1 (48%) | 4.0 | 10.2 (48%) | ||||