Authors: Janete M Adamski Rodrigo Danieloski Sidnei Deuner Eugênia J B Braga Luis A S de Castro José A Peters
Publish Date: 2012/03/21
Volume: 34, Issue: 5, Pages: 1827-1836
Abstract
This study aimed to evaluate the effects of different iron concentrations on growth characteristics antioxidant enzyme activities nutrient absorption and anatomical changes in sweet potato Ipomoea batatas L To accomplish this seedlings from apical branches of plants that had already been established in the greenhouse were rooted in a hydroponic sponge and then transplanted into a hydroponic system intermittently for 2 weeks and irrigated with nutrient solutions containing iron ferricEDTA at concentrations of 045 09 45 and 90 mmol L−1 Height leaf area and total biomass were significantly reduced at iron concentrations of 45 and 90 mmol L−1 The iron concentrations in the established leaves and those that developed after the solution supplementation increased significantly The amounts of other nutrients were also affected with manganese showing the most significant decrease The activities of the antioxidant enzymes superoxide dismutase and ascorbate peroxidase increased in plants grown in the 90 mmol L−1 iron solution At this concentration however the stomatal densities were reduced on the abaxial surfaces of the leaves although the stomatal diameters increased The ultrastructures of the radical cells showed mitochondrial impairment at high iron concentrations however the chloroplast structures remained unaffected
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