Table 1.
Measurement of methane emissions from plants grown under controlled conditions. (For Chlamydomonas and Arabidopsis, input refers to the methane concentration of air supplied at 5 ml min−1. For rice and maize, input refers to the air inside the closed chamber when the experiment was started. Samples were removed for analysis (output). Values for the mean and standard deviation of methane mixing ratio and δ13C in triplicate analyses of each air sample are shown.)
| plant | input CH4 (ppb) | output CH4 (ppb) | input air δ13C (‰) | output air δ13C (‰) | mass of leaves at start (g) | mass of water lost (g) |
|---|---|---|---|---|---|---|
| Chlamydomonas | 1901±4 | 1904±9 | n.a. | n.a. | n.a. | n.a. |
| Arabidopsis | 1893±5 | 1887±5 | n.a. | n.a. | n.a. | n.a. |
| rice, 25 hours | 1914±7 | 1916±9 | −47.3±0.0 | −47.1±0.1 | n.a. | n.a. |
| maize, 24 hours | 2021±5 | 2027±15 | −48.5±0.1 | −48.5±0.0 | 156.3 | 2.4 |
| maize, 48 hours | 1984±6 | 1977±2 | −48.0±0.1 | −48.0±0.1 | 153.9 | 5.1 |