Table 2.
Comparisons between species of contrasting root turnover types within each wetland type, comparisons between species with similar root turnover types, but growing in different types of a wetlands, and comparisons between the harvests. Comparisons are expressed as ratios of the least squares means of antioxidant enzyme levels between species with annual and perennial roots (R. alba/C. exilis;S. androcladum/S. microcarpus), between species of the nutrient-poor wetland and nutrient-rich wetlands (C. exilis/S. microcarpus;R. alba/S. androcladum), and between the different harvests of field-grown plants (August/June; September/August). The least squares means are based on ANOVAs presented in Table 1 with significance of the differences between the numerator and denominator in the ratios being calculated using Bonferroni-corrected contrasts.
| Ra/Ce | Sa/Sm | Ce/Sm | Ra/Sa | Aug/Jun | Sep/Aug | |
|---|---|---|---|---|---|---|
| Garden | ||||||
| APX | 2.9*** | 4.8*** | 1.9* | 1.1 | – | – |
| SOD | 1.3+ | 1.1 | 1.2 | 1.4** | ||
| POX | 1.4*** | 1.2*** | 0.95 | 1.1 | – | – |
| CAT | 1.0 | 1.3 | 3.1** | 2.5*** | – | – |
| GR | 2.1 | 4.5** | 2.2 | 1.0 | – | – |
| MDA | 0.33*** | 0.99 | 0.94 | 0.32*** | – | – |
| Field | ||||||
| APX | 2.3*** | 3.0*** | 0.67* | 0.51*** | 3.2*** | 0.59*** |
| SOD | 1.7*** | 2.0*** | 0.53*** | 0.46*** | 4.3*** | 0.85 |
| POX | 1.1 | 1.0 | 0.9+ | 0.9 | 2.3*** | 0.61*** |
| CAT | 0.7*** | 1.2 | 2.4*** | 1.5** | 1.8*** | 0.66*** |
| GR | 2.6*** | 1.5+ | 1.2 | 2.0*** | 0.85 | 1.2 |
| MDA | 0.50*** | 0.71*** | 0.67*** | 0.47*** | 1.1 | 1.0 |
Significance levels and trends are given:
P < 0.001,
P < 0.01,
P < 0.05,
+P < 0.10.