Responses to excess iron in sweet potato: impacts on growth, enzyme activities, mineral concentration, and anatomy

• Autorzy: Adamski J.M. , Danieloski R. , Deuner S. , Braga E. J. , de Castro L. A. , Peters J. A.
• Języki publikacji: EN

Abstrakty

EN

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 (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.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2012
• Tom: 34
• Numer: 5
• Opis fizyczny: p.1837-1846,fig.,ref.

Twórcy

autor

Adamski J.M.

• Department of Botany, Institute of Biology, Federal University of Pelotas, UFPel, Campus Universitario S/N, Capao do Leao, RS 96160-000, Brazil

autor

Danieloski R.

• Department of Botany, Institute of Biology, Federal University of Pelotas, UFPel, Campus Universitario S/N, Capao do Leao, RS 96160-000, Brazil

autor

Deuner S.

• Researcher at Embrapa Cerrados, BR 020, km 18, Planaltina, DF 73310-970, Brazil

autor

Braga E. J.

• Department of Botany, Institute of Biology, Federal University of Pelotas, UFPel, Campus Universitario S/N, Capao do Leao, RS 96160-000, Brazil

autor

de Castro L. A.

• Researcher at Embrapa Clima Temperado, BR 392, km 78, Pelotas, RS 96010-971, Brazil

autor

Peters J. A.

• Department of Botany, Institute of Biology, Federal University of Pelotas, UFPel, Campus Universitario S/N, Capao do Leao, RS 96160-000, Brazil

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