Table 2.
Average diel apparent respiratory 13C fractionation (e, Equation 2) for different potential respiratory substrates in leaves of Nicotiana sylvestris wild-type and pgm mutant plants (all from experiment 2)
| Substrate | e (‰) | |
|---|---|---|
| Wild type | pgm | |
| Organic matter | –3.7±0.5 | –3.1±0.5 |
| Sugars | –3.4±0.6 | –3.9±0.5 |
| Starch | –3.1±0.5 | –2.8±0.6 |
| Malate | 4.5±0.3 | 4.0±0.4 |
| Citrate | 3.6±0.3 | 2.4±0.4 |
No significant differences between genotypes for any substrate were observed (t-test, P>0.05). Mean values ±1 SE are given (n=19–21).