ISHS Acta Horticulturae 618: XXVI International Horticultural Congress: Environmental Stress and Horticulture Crops
INFLUENCE OF CALCIUM DEFICIENCY ON DISTRIBUTION AND ANTIOXIDATIVE SYSTEM IN TOMATO PLANTS |
| Authors: | M. Schmitz-Eiberger, G. Noga |
| Keywords: | blossom-end rot; calcium chloride; deficiency symptoms, extractable calcium; tomato fruit and leaves |
| Abstract:
In this study the influence of a deficient calcium supply on the amount of water soluble and EGTA extractable calcium was measured. The effect of a deficient calcium supply on the lipid peroxidation rate and the activity of antioxidative enzymes, such as superoxide dismutase and peroxidase was determined in Lycopersicon lycopersicum leaves. For the induction of calcium deficiency, calcium content in the nutrient solution was reduced from 2.9 mM to 0.29 mM. As a consequence fruits and leaves developed distinct calcium deficiency symptoms within 6 weeks. Malondialdehyde (MDA) as a degradation product of lipid peroxidation increased in the calcium deficient leaves. Superoxide dismutase activity was reduced and peroxidase activity increased. Foliar sprays with formulated CaCl2 solution on a weekly basis reduced blossom-end rot symptoms on fruits and calcium deficiency symptoms in leaves. Furthermore, MDA release as well as superoxide dismutase and peroxidase activities were less affected than in the calcium deficient group. A high linear correlation between EGTA-extractable calcium and the incidence of deficiency symptoms in tomato fruits was established (r2=0.9772), while the coefficient of determination between water-extractable calcium and the incidence of blossom-end rot was r2 = 0.2736 | |
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