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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

New insights into cadmium stressful-conditions: Role of ethylene on selenium-mediated antioxidant enzymes

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Author(s):
Alves, Leticia Rodrigues [1] ; dos Reis, Andre Rodrigues [2] ; Prado, Emilaine Rocha [1] ; Lavres, Jose [3] ; Pompeu, Georgia Bertoni [4] ; Azevedo, Ricardo Antunes [5] ; Gratao, Priscila Lupino [1]
Total Authors: 7
Affiliation:
[1] Univ Estadual Paulista UNESP, FCAV, Dept Biol Aplicada Agr, BR-14884900 Jaboticabal, SP - Brazil
[2] Univ Estadual Paulista UNESP, Lab Biol, Fac Ciencias Engn, BR-17602496 Tupa, SP - Brazil
[3] Univ Sao Paulo, CENA, Lab Nutr Mineral Plantas, BR-13418900 Piracicaba, SP - Brazil
[4] Univ Sao Paulo, ESALQ, Dept Ciencia Solo, BR-13418900 Piracicaba, SP - Brazil
[5] Univ Sao Paulo, ESALQ, Dept Genet, BR-13418900 Piracicaba, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY; v. 186, DEC 30 2019.
Web of Science Citations: 0
Abstract

Cadmium (Cd) contamination has generated an environmental problem worldwide, leading to harmful effects on human health and damages to plant metabolism. Selenium (Se) is non essential for plants, however it can improve plant growth and reduce the adverse effects of abiotic stress. In addition, ethylene may interplay the positive effects of Se in plants. In order to investigate the role of ethylene in Se-modulation of antioxidant defence system in response to Cd-stress, we tested the hormonal mutant Epinastic (epi) with a subset of constitutive activation of the ethylene response and Micro-Tom (MT) plants. For this purpose, Se mineral uptake, Cd and Se concentrations, pigments, malondialdeyde (MDA) and hydrogen peroxide (H2O2) contents, ethylene production, glutathione (GSH) compound, and superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase (CAT), glutathione reductase (GR) and glutathione peroxidase (GSH-Px) activities were analysed in MT and epi plants submitted to 0.5 mM CdCl2 and 1 mu M of selenate or selenite. MT plants treated with both Se forms increased growth in the presence or not of 0.5 mM CdCl2, but not change epi growth. Both Se forms reduced Cd uptake in MT plants and cause reverse effect in epi plants. P, Mg, S, K and Zn uptake increased in epi plants with Se application, irrespective to Cd exposure. Chlorophylls and carotenoids contents decreased in both genotypes under Cd exposure, in contrast to what was observed in epi leaves in the presence of Se. When antioxidant enzymes activities were concerned, Se application increased Mn-SOD, Fe-SOD and APX activities. In the presence of Cd, MT and epi plants exhibited decreased SOD activity and increased CAT, APX and GR activities. MT and epi plants with Se supply exhibited increased APX and GR activities in the presence of Cd. Overall, these results suggest that ethylene may be involved in Se induced-defence responses, that triggers a positive response of the antioxidant system and improve growth under Cd stress. These results showed integrative roles of ethylene and Se in regulating the cell responses to stressful-conditions and, the cross-tolerance to stress could be used to manipulate ethylene regulated gene expression to induce heavy metal tolerance. (AU)

FAPESP's process: 17/04787-6 - Selenium modulation in ethylene synthesis and cadmium tolerance
Grantee:Priscila Lupino Gratão
Support Opportunities: Regular Research Grants