Table 4.
Amount of assimilated 13C in each organ in the 13C tracing experiment
| 13CO2 exposure | Organ | Light-intact | Shading | P-value* |
|---|---|---|---|---|
| Fruit | Fruit | 0·444 ± 0·231 (8) | 0·075 ± 0·051 (12) | 0·0002 |
| 66·4 % | 22·2 % | |||
| Leaf | 0·029 ± 0·009 (8) | 0·084 ± 0·089 (12) | >0·10 | |
| 4·3 % | 24·9 % | |||
| Stem | 0·179 ± 0·290 (8) | 0·179 ± 0·218 (11) | >0·10 | |
| 26·8 % | 52·9 % | |||
| Below-ground | 0·017 ± 0·017 (3) | 0·000 ± 0·000 (3) | – | |
| 2·5 % | 0·0 % | |||
| Leaf | Fruit | 0·097 ± 0·091 (11) | 0·066 ± 0·076 (8) | >0·10 |
| 0·8 % | 0·6 % | |||
| Leaf | 7·890 ± 1·850 (12) | 7·740 ± 3·680 (8) | >0·10 | |
| 65·5 % | 67·8 % | |||
| Stem | 1·090 ± 0·511 (12) | 1·260 ± 0·687 (8) | >0·10 | |
| 9·1 % | 11·0 % | |||
| Below-ground | 2·960 ± 0·910 (3) | 2·350 ± 1·810 (3) | – | |
| 24·6 % | 20·6 % |
13CO2 was exposed to young fruit and leaves under natural light conditions (light-intact) and fruit-shading conditions for 2 d. Mass of 13C (mg) was estimated by comparing 13C traced plants and control plants. Upper, mean ± s.d. (sample size); lower, percentage.
* Mann–Whitney U-test. A statistical test was not performed for below-ground parts due to the small sample size.