Table 2. Chlorophyll (Chl) a and b contents, ratio a/b and gas exchange parameter (ACO2) measured in fully developed leaves of Citrus aurantium seedlings.
| +Fe | -Fe | ANOVA | |||||
|---|---|---|---|---|---|---|---|
| Ct | S | Ct | S | Fe | S | Fe x S | |
| Chl (μmol m-2) | |||||||
| a | 356.4a | 217.5b | 57.4c | 46.9c | *** | ** | ** |
| b | 273.5a | 89.4b | 48.8c | 23.4d | *** | *** | *** |
| a/b | 1.3c | 2.4a | 1.2c | 2b | * | *** | ns |
| ACO2 (μmol CO2 m-2 s-1) | 6.8a | 3.1b | 2.5b | 1.3c | ** | ** | * |
Plants were grown for 21 days in Fe-sufficient (+Fe) or Fe-deficient (-Fe) nutrient solutions with the non-stressed (Ct) or the flooding treatment (S).
1Values are the means of six independent plants per treatment (n = 6). For a comparison of the means, an ANOVA followed by the Fisher´s least significant differences (LSD) test, calculated at the 95% confidence level, was performed. Different letters in the same row indicate significant differences between the different genotypes and treatments. Levels of significance were represented by P < 0.05 (*), P < 0.01 (**), P < 0.001 (***) and ns (non-significant).