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(Referência obtida automaticamente do SciELO, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Potential of hydrogen (pH) differentially modulates cadmium stress response in abscisic acid-deficient sitiens tomato mutant

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Autor(es):
Georgia Bertoni Pompeu ; Guilherme Bovi Ambrosano ; Milca Bartz Vilhena ; Rogério Falleiros Carvalho ; Priscila Lupino Gratão ; Felipe Andrino ; Simone Possedente de Lira ; Ricardo Antunes Azevedo
Número total de Autores: 8
Tipo de documento: Artigo Científico
Fonte: Bragantia; n. ahead, p. -, 2019.
Resumo

ABSTRACT Uptake of nutrients and cadmium (Cd) are dependent upon many factors, including plant species, ions concentration and pH. Tolerance to Cd-induced oxidative stress can be modulated by phytohormones such as abscisic acid (ABA), which induce the production of reactive oxygen species, activating proteins and enzymes involved in stress response and possibly stress tolerance. The present study aimed to evaluate the biochemical variations induced by Cd in ABA-deficient sitiens tomato mutant (sit) and its wild-type counterpart, Micro-Tom (MT), grown at different pH conditions. The plants were cultivated in nutrient solution (pH 5, 6 and 7; 20-days) and were then further grown over a 48-h period in 0 or 50 ?M CdCl2 at pH 6. Before Cd addition, the concentrations of nitrogen, sulfur, copper, iron and zinc were determined and variations in nutrients concentrations were observed. After Cd addition, sit roots grown at pH 5 and 7 did not exhibit differences in ascorbate peroxidase (APX) activity in 0 or 50 ?M CdCl2, and sit root grown at pH 6 exhibited lower glutathione reductase (GR) activity in the presence of Cd. Moreover, sit shoot grown at pH 5 showed decreased activities of superoxide dismutase (SOD), Mn-SOD II and Cu/Zn-SOD V, in 0 and 50 ?M CdCl2. The results indicated that pH modulates the plant nutrition in a complex way and may involve multiple ABA signaling pathways. Likewise, ABA status seems to be related with the Cd-translocation within the plant, suggesting that Cd, ABA and pH responses cannot be evaluated as isolated systems. (AU)

Processo FAPESP: 11/50982-9 - Análise fisiológica, bioquímica e ultraestrutural de mutantes de tomateiro (Lucopersicum esculentum Mill., cv. micro-tom) expostos ao cádmio e alumínio
Beneficiário:Georgia Bertoni Pompeu
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 09/54676-0 - Estresse oxidativo induzido por metais: novas abordagens
Beneficiário:Ricardo Antunes de Azevedo
Linha de fomento: Auxílio à Pesquisa - Temático