Table 1.
Shoot and root fresh biomass, root/shoot ratio, and shoot phytohormone concentrations in control, aphid-, nematode-, and aphid + nematode-treated plants at 3 days after infestation
| Parameter | Treatment | χ2 | P | |||
|---|---|---|---|---|---|---|
| Control | Aphid | Nematode | Aphid + nematode | |||
| Shoot biomass (mg freshweight) | 373.1±72.9 | 383.9±40.7 | 361.9±49.6 | 365.6±53.0 | 0.91 | 0.82 |
| Root biomass (mg freshweight) | 118.2±26.5 | 107.7±12.6 | 112.2±23.2 | 107.9±18.9 | 0.75 | 0.86 |
| Root/shoot ratio | 0.32±0.08 | 0.28±0.05 | 0.31±0.07 | 0.30±0.05 | 2.42 | 0.49 |
| JA (ng (mg dryweight)–1) | 0.55±0.16 | 0.73±0.23 | 0.61±0.30 | 0.65±0.19 | 4.58 | 0.21 |
| SA (ng (mg dryweight)–1) | 2.76±0.91 | 2.42±0.24 | 2.64±1.05 | 2.66±0.72 | 0.99 | 0.80 |
| SAG (ng (mg dryweight)–1) | 3.53±2.24 | 1.56±0.55 | 3.26±3.99 | 2.53±3.00 | 4.59 | 0.21 |
Values are means ± SD. Statistical analyses were done with Kruskal–Wallis tests (df = 3, χ2 and P values are shown). There were 10 replicates per treatment (data are shown from one representative experiment of three independent experiments for morphological data). JA = jasmonic acid; SA = salicylic acid; SAG = salicylic acid glucoside