02242naa a2200301 a 450000100080000000500110000800800410001902200140006002400350007410000190010924501440012826000090027252013750028165000120165665000110166865000130167965000100169265300130170265300160171565300220173165300150175370000190176870000150178770000200180270000240182270000180184677300760186419508012013-02-25       2012    bl uuuu     u00u1 u    #d  a0137-58817 a10.1007/s11738-012-0981-32DOI1 aADAMSKI, J. M.  aResponses to excess iron in sweet potatobimpacts on growth, enzyme activities, mineral concentrations, and anatomy.h[electronic resource]  c2012  aThis 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 (ferric-EDTA) at concentrations of 0.45, 0.9, 4.5, and 9.0 mmol L?1. Height, leaf area, and total biomass were significantly reduced at iron concentrations of 4.5 and 9.0 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 9.0 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.  astomata  aBatata  aBiomassa  aFerro  aEstresse  aFerric-EDTA  aIpomoea batatas L  aNutrientes1 aDANIELOSKI, R.1 aDEUNER, S.1 aBRAGA, E. J. B.1 aCASTRO, L. A. S. de1 aPETERS, J. A.  tActa Physiologiae Plantarumgv. 34, n. 5, p. 1827-1836, September 2012.