Table 3.
Endogenous concentrations of phytohormones in maize seedlings (cv Colisee) grown for 7 days at 18 or 12°C, in a soil-free filter roll culture system with (+Si) or without (–Si) silicic acid seed-soaking (–Si) during a 3-day pre-germination period at 18°C.
| Tissue | Shoot | Root | ||||
|---|---|---|---|---|---|---|
| Temperature | 18°C | 12°C | 12°C | 18°C | 12°C | 12°C |
| Treatment | −Si | −Si | +Si | −Si | −Si | +Si |
| Phytohormones | [ng g−1 fresh weight] | |||||
| IAA | 76.77 ± 9.90a | 28.14 ± 4.65b | 102.12 ± 16.54a | 31.45 ± 8.81a | 12.76 ± 0.37b | 40.10 ± 13.43a |
| Zeatin | 3.24 ± 0.84a | 1.10 ± 0.22b | 3.62 ± 0.65a | 1.29 ± 0.49a | 0.40 ± 0.04b | 1.21 ± 0.31a |
| ABA | 50.63 ± 4.13b | 31.02 ± 4.04c | 109.56 ± 13.69a | 46.56 ± 8.65a | 14.97 ± 0.91b | 48.78 ± 14.19a |
| GA | 55.60 ± 10.29b | 18.26 ± 3.14c | 67.20 ± 9.77a | 25.07 ± 6.27a | 9.51 ± 0.70b | 30.12 ± 10.49a |
| JA | 0.44 ± 0.07a | 0.28 ± 0.03b | 0.42 ± 0.09a | ND | ND | ND |
| SA | 44.89 ± 6.79a | 16.78 ± 3.17b | 56.27 ± 15.26a | 21.96 ± 4.71a | 9.53 ± 0.79b | 28.94 ± 12.00a |
IAA, indole acetic acid; ABA, abcsisic acid; GA, gibberellic acid; JA, jasmonic acid; SA, salicylic acid. Means of three replicates. Significant differences (P < 0.05) are indicated by different characters. ND, Not Detectable.