Growth, photosynthesis and antioxidant defense system in Zn-deficient red cabbage plants
2010
Hajiboland, R.,University of Tabriz (Iran Islamic Republic). Plant Science Dept. | Amirazad, F.,University of Tabriz (Iran Islamic Republic). Plant Science Dept.
The effect of Zn deficiency was studied in red cabbage (Brassica oleracea L. var. capitata f. rubra) plants grown in nutrient solution under controlled environmental conditions. Zinc starvation affected the number (61%), surface area (72%) and biomass (62%) of leaves more than root biomass (42%). Although chlorophyll fluorescence parameters revealed the occurrence of photoinhibition following declined stomatal conductance and reduction of CO2 available at carboxylation sites, photosynthesis apparatus was not damaged seriously under Zn deficiency conditions. Chlorophyll a, chlorophyll a/b ratio, soluble carbohydrates and starch declined but anthocyanins and free phenolics were accumulated under Zn deficiency conditions. Activities of ascorbate peroxidase and catalase were enhanced under Zn deficiency conditions, whereas the activity of superoxide dismutase declined in leaves but not in roots of Zn-deficient plants. Maintenance of superoxide dismutase activity and malondialdehyde content in roots demonstrated that roots were more protected against reactive oxygen species imbalance under Zn deficiency conditions than leaves. This was well correlated with the lower sensitivity of roots to low Zn supply.
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