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2017 | 26 | 5 |

Tytuł artykułu

Assessment of iron toxicity in tropical grasses with potential for revegetating mined areas

Warianty tytułu

Języki publikacji

EN

Abstrakty

EN
The selection of plant species resistant to iron toxicity is important in the ecological rehabilitation of mining areas. The objective of our study was to identify the degree of resistance of the grasses Paspalum densum, Hyparrhenia rufa, and Echinochloa crus-galli to iron toxicity on the basis of physiological and biochemical responses in a nutrient solution. The experiments initially consisted of hydroponic cultivation of the three plant species to evaluate short-term responses at increasing concentrations of Fe-EDTA 0.009 (control), 1, 2, 4, 7, and 9 mM; and afterward by prolonged exposure of the resistant grasses to Fe-EDTA concentrations of 0.009 and 7 mM. Iron concentration increased in the leaves of all species evaluated, showing values above the phytotoxic threshold. P. densum and E. crus-galli were selected in view of their resistance to iron toxicity, evidenced mainly by low malondialdehyde (MDA) values due to mechanisms of tolerance and avoidance. In contrast, H. rufa showed an increase in MDA values and a reduction in gas exchange, revealing considerable sensitivity to iron toxicity. The results showed the potential for using P. densum and E. crus-galli in the revegetation of areas degraded by mining iron.

Słowa kluczowe

Wydawca

-

Rocznik

Tom

26

Numer

5

Opis fizyczny

p.2167-2173,fig.

Twórcy

autor
  • Instituto de Ciencias Biologicas e da Saude, Universidade Federal de Viçosa (UFV), Campus Florestal, 35690-000-Florestal, Minas Gerais, Brazil
  • Instituto de Ciencias Biologicas e da Saude, Universidade Federal de Viçosa (UFV), Campus Florestal, 35690-000-Florestal, Minas Gerais, Brazil
  • Instituto de Ciencias Biologicas e da Saude, Universidade Federal de Viçosa (UFV), Campus Florestal, 35690-000-Florestal, Minas Gerais, Brazil
autor
  • Instituto de Ciencias Biologicas e da Saude, Universidade Federal de Viçosa (UFV), Campus Florestal, 35690-000-Florestal, Minas Gerais, Brazil

Bibliografia

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  • 2. PEREIRA A.A., VAN HATTUM B., BROUWER A., VAN BODEGOM P.M., REZENDE C.E., SALOMONS W. Effects of iron-ore mining and processing on metal bioavailability in a tropical coastal lagoon. Journal of Soils and Sediments, 8 (4), 239, 2008.
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  • 10. LIEBENBERG D., CLAASSENS S., VAN RENSBURG L. Insights and lessons learned from the long-term rehabilitation of an iron ore mine. International Journal of Environmental Research, 7 (3), 633, 2013.
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  • 26. PINTO S.S., DE SOUZA A.E., OLIVA M.A., PEREIRA E.G. Oxidative damage and photosynthetic impairment in tropical rice cultivars upon exposure to excess iron. Scientia Agricola, 73 (3), 217, 2016.
  • 27. SILVA J.O.C., PAIVA E.A.S., MODOLO L.V., NASCENTES C.C., FRANÇA M.G.C. Removal of root apices enables study of direct toxic effects of aluminum on rice (Oryza sativa L.) leaf cells. Environmental and Experimental Botany, 95, 41, 2013.

Typ dokumentu

Bibliografia

Identyfikatory

Identyfikator YADDA

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