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[PMID]: | 27135816 |
[Au] Autor: | Mesnoua M; Mateos-Naranjo E; Barcia-Piedras JM; Pérez-Romero JA; Lotmani B; Redondo-Gómez S |
[Ad] Endereço: | Scientific and Technical Research Centre for Arid Areas (CRSTRA), BP 1682 R.P., 07000, Biskra, Algeria; Laboratory of Plant Protection, University of Abdelhamid Ben Badis of Mostaganem, Algeria. |
[Ti] Título: | Physiological and biochemical mechanisms preventing Cd-toxicity in the hyperaccumulator Atriplex halimus L. |
[So] Source: | Plant Physiol Biochem;106:30-8, 2016 Sep. | [Is] ISSN: | 1873-2690 |
[Cp] País de publicação: | France |
[La] Idioma: | eng |
[Ab] Resumo: | The xero-halophyte Atriplex halimus L., recently described as Cd-hyperaccumulator, was examined to determine Cd toxicity threshold and the physiological mechanisms involved in Cd tolerance. An experiment was conducted to investigate the effect of cadmium from 0 to 1350 µM on chlorophyll fluorescence parameters, gas exchange, photosynthetic pigment concentrations and antioxidative enzyme activities of A. halimus. Cadmium, calcium, iron, manganese, magnesium, potassium, phosphorous, sodium and zinc concentrations were also analyzed. Plants of A. halimus were not able to survive at 1350 µM Cd and the upper tolerance limit was recorded at 650 µM Cd; although chlorosis was observed from 200 µM Cd. Cadmium accumulation increased with increase in Cd supply, reaching maxima of 0.77 and 4.65 mg g(-1) dry weight in shoots and roots, respectively, at 650 µM Cd. Dry mass, shoot length, specific leaf area, relative growth rate, net photosynthetic rate, stomatal conductance, pigments contents and chlorophyll fluorescence were significantly reduced by increasing Cd concentration. However, the activities of superoxide dismutase (SOD; EC1.15.1.1), catalase (CAT; EC1.11.1.6) and guaiacol peroxidase (GPx; EC1.11.1.7) were significantly induced by Cd. Exposures to Cd caused also a significant decrease in P contents in roots, Mg and Mn contents in shoots and Fe and K contents in roots and shoots and had no effect on Ca, Na and Zn contents. The tolerance of A. halimus to Cd stress might be related with its capacity to avoid the translocation of great amounts of Cd in its aboveground tissues and higher activities of enzymatic antioxidants in the leaf. |
[Mh] Termos MeSH primário: |
Atriplex/fisiologia Cádmio/toxicidade
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[Mh] Termos MeSH secundário: |
Antioxidantes/metabolismo Atriplex/efeitos dos fármacos Atriplex/enzimologia Atriplex/crescimento & desenvolvimento Biomassa Clorofila/metabolismo Fluorescência Gases/metabolismo Luz Fotossíntese/efeitos dos fármacos Fotossíntese/efeitos da radiação Complexo de Proteína do Fotossistema II/metabolismo
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[Pt] Tipo de publicação: | JOURNAL ARTICLE |
[Nm] Nome de substância:
| 0 (Antioxidants); 0 (Gases); 0 (Photosystem II Protein Complex); 00BH33GNGH (Cadmium); 1406-65-1 (Chlorophyll) |
[Em] Mês de entrada: | 1703 |
[Cu] Atualização por classe: | 170327 |
[Lr] Data última revisão:
| 170327 |
[Sb] Subgrupo de revista: | IM |
[Da] Data de entrada para processamento: | 160503 |
[St] Status: | MEDLINE |
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