Mineral nutrition and enzymatic adaptation induced by arsenate and arsenite exposure in lettuce plants.
Plant Physiol Biochem
; 71: 307-14, 2013 Oct.
Article
em En
| MEDLINE
| ID: mdl-24007815
Arsenate (As(V)) and arsenite (As(III)) contamination is able to interfere negatively on plant metabolism, promoting a reduction of nutrients uptake and transport and also an increase of reactive oxygen species (ROS) generation. However, some plants are considered tolerant against As exposure through the activation of defense mechanisms. Therefore, this study aimed to evaluate the effects of different As(V) and As(III) concentrations (0.0, 6.6, 13.2, 26.4 and 52.8 µmol L(-1)), on mineral nutrients concentration [calcium (Ca), magnesium (Mg), phosphorous (P), iron (Fe), manganese (Mg) and copper (Cu)], on membrane lipid peroxidation and also on the enzymes belonging to the antioxidant defense system [superoxide dismutase (SOD), total peroxidase (POX), catalase (CAT), glutathione reductase (GR) and ascorbate peroxidase (APX)] of plants of Lactuca sativa L. cv Hanson. As(V) and As(III), showed, in general, the same toxic effects in leaves and roots with significant changes in essential macro- and micronutrients concentration. Lipid peroxidation of cellular membranes was also observed in tested plants, probably resulted from an action of ROS generated by this metalloid. The increase of ROS generation and their scavenge were evident since an increase of SOD, POX, CAT and APX activity in leaves, and SOD, CAT and GR activity in roots were observed. Therefore, As(V) and As(III) exposure resulted in toxic effects in leaves and roots of lettuce plants; however, this plant species was able to attenuate these potential As damages through the activation of defense mechanisms, keeping its metabolism. Arsenic-tolerant plants are considered a great risk to the public health since it results in As insertion to the food chain.
Palavras-chave
APX; Antioxidant enzymes; Arsenic; As; As(III); As(V); CAT; GR; Lactuca sativa cv Hanson; MDA; Mineral nutrients; POX; ROS; SOD; Toxicity; arsenate; arsenic; arsenite; ascorbate peroxidase; catalase; glutathione reductase; malondialdehyde; reactive oxygen species; superoxide dismutase; total peroxidase
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Arseniatos
/
Arsenitos
/
Lactuca
Idioma:
En
Revista:
Plant Physiol Biochem
Assunto da revista:
BIOQUIMICA
/
BOTANICA
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
França