Table 4.
Lettucenin A content in leaf and root tissue of lettuce (cv. Tizian), grown for 10 days in peat culture substrate after treatment with biotic (R. solani AG1-IB inoculation) and abiotic (CuSO4, 5% w/v foliar sprays) elicitors and benzoic acid application (3 × 110 µg kg−1 substrate throughout the growing period via irrigation) and benzoic acid application with R. solani inoculated plants. Means ± SE of four replicates per treatment. Significant differences (t-test, p ≤ 0.05) compared with untreated control plants are indicated by *; na = not applicable.
| Analysed Plant Tissue | ||||
|---|---|---|---|---|
| Treatments | Leaves without Symptoms | Leaves with Symptoms of R. solani |
CuSO4 Treated Leaves |
|
| Leaf Content [µg g−1 FW] |
Root Content [µg g−1 FW] |
|||
| Untreated control | 0.17 ± 0.01 | na | na | 0.18 ± 0.01 |
| CuSO4 foliar application | 0.17 ± 0.06 | na | 7.96 ± 0.79 * | 0.20 ± 0.01 |
| R. solani inoculation | 0.00 | 1.20 ± 0.68 | na | 0.42 ± 0.04 * |
| Benzoic acid application | 0.21 ± 0.01 * | na | na | 0.00 |
| R. solani + Benzoic acid | 0.12 ± 0.07 | 0.41 ± 0.13 * | na | 0..65 ± 0.14 * |