Table I. Root mycorrhization, shoot dry weight, and total P concentration.
| Parameter | Control | AM | Pi |
|---|---|---|---|
| Degree of mycorrhization (%) | 0 | 72 ± 7 | 0 |
| Arbuscular abundance (%) | 0 | 51 ± 3 | 0 |
| Shoot dry weight (g) | 0.33 ± 0.04 | 0.50 ± 0.03* | 0.60 ± 0.13** |
| Shoot total P (mg P g−1 dry weight ) | 1.5 ± 0.2 | 1.8 ± 0.3 | 13.2 ± 2.1*** |
M. truncatula plant material was harvested 4 wpi from control plants, plants infected with R. irregularis (AM), or plants treated with 5 mm Pi (Pi). Values are averages ± sd of three independent experiments, with four to six plants used in each experiment. Asterisks indicate significant differences between treatments and the control (one-way ANOVA, P < 0.05 [*], P < 0.01 [**], and P < 0.001 [***]; GraphPad Prism).