TABLE 1.
Results of analysis of variance
| Parameter | Analysis of variance (P value)a
|
||||||
|---|---|---|---|---|---|---|---|
| Time effect
|
P availability effect
|
Time-P interaction
|
C effect (expt 2)b | ||||
| Expt 1 | Expt 2 | Expt 1 | Expt 2 | Expt 1 | Expt 2 | ||
| Root dry mass (Fig. 1A) | 0.28 | <0.05 | 0.09 | <0.01 | 0.11 | 0.61 | <0.001 |
| Root C uptake (Fig. 1B) | <0.05 | 0.06 | 0.07 | <0.05 | <0.01 | <0.05 | 0.28 |
| C flow to the AM fungus (Fig. 2) | 0.22 | <0.01 | 0.25 | <0.05 | <0.05 | <0.001 | 0.23 |
| NLFA/phospholipid ratio, intraradical (Fig. 3A) | <0.01 | <0.001 | <0.05 | <0.05 | <0.01 | 0.84 | 0.16 |
| NLFA/phospholipid ratio, extraradical (Fig. 3B) | <0.01 | <0.01 | <0.05 | 0.18 | 0.77 | 0.69 | 0.38 |
| GiPT transcription levels (Fig. 4) | 0.31 | <0.01 | <0.01 | <0.05 | 0.76 | 0.61 | 0.82 |
a
For both experiments the results were analyzed using a two-way analysis of variance, including three harvests and two different P treatments.
b
The results of experiment 2 were also analyzed using a three-way analysis of variance, including the last two harvests, two P treatments, and two C treatments. P values from the two-way analysis of variance are shown for time and P effects, but for the C effect the P values are from a three-way analysis of variance.