Responses of Noccaea caerulescens and Lupinus albus in trace elements-contaminated soils
Autor/es
Martínez Alcalá, Isabel; Hernández, Luis Eduardo; Esteban, Elvira; Walker, David; Bernal, PilarFecha
2013Disciplina/s
Ciencias AmbientalesMateria/s
ChlorophyllGlutathione
Heavy metals
Malondialdehyde
Phenolics
Phytochelatins
Resumen
Plants exposed to trace elements can suffer from oxidative stress, which is characterised by the accumulation of reactive oxygen species, alteration in the cellular antioxidant defence system and ultimately lipid peroxidation. We assessed the most-appropriate stress indexes to describe the response of two plant species, with different strategies for coping with trace elements (TEs), to particular contaminants.
Noccaea caerulescens, a hyperaccumulator, and Lupinus albus, an excluder, were grown in three soils of differing pH: an acidic soil, a neutral soil (both contaminated mainly by Cu, Zn and As) and a control soil. Then, plant stress indicators were measured.
As expected, N. caerulescens accumulated higher levels of Zn and Cd in shoots than L. albus, this effect being stronger in the acid soil, reflecting greater TE solubility in this soil. However, the shoot concentrations of Mn were higher in L. albus than in N. caerulescens, while the As concentration was similar in the two...