Cadmium toxicity degree on tomato development is associated with disbalances in B and Mn status at early stages of plant exposure

Autor(es)

Amaral Carvalho, Marcia Eugenia ^[1] ; Piotto, Fernando Angelo ^[2] ; Franco, Monica Regina ^[1] ; Reis Borges, Karina Lima ^[1] ; Gaziola, Salete Aparecida ^[1] ; Camargo Castro, Paulo Roberto ^[3] ; Azevedo, Ricardo Antunes ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo Esalq USP, Dept Genet, Escola Super Agr Luiz Queiroz, BR-13418900 Piracicaba, SP - Brazil

^[2] Univ Sao Paulo Esalq USP, Dept Prod Vegetal, Escola Super Agr Luiz Queiroz, BR-13418900 Piracicaba, SP - Brazil

^[3] Univ Sao Paulo Esalq USP, Dept Ciencias Biol, Escola Super Agr Luiz Queiroz, BR-13418900 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ECOTOXICOLOGY; v. 27, n. 10, p. 1293-1302, DEC 2018.
• Citações Web of Science: 9

Resumo

Cadmium (Cd) toxicity is frequently coupled to its accumulation in plants, but not always the highest Cd concentration triggers the worst damages, indicating that additional events influence the magnitude of Cd side-effects. We investigated the early mechanisms behind the differential Cd-induced impacts on plant development of four tomato accessions with contrasting tolerance to Cd toxicity. At organ level, the highest Cd concentration was not associated with the largest biomass losses. In leaves, changes in superoxide dismutase and catalase activities were not related to differences in Cd concentration, which was unable to provoke H2O2 overproduction on the sixth day of plant exposure to this metal. Further investigation in the mineral profile revealed that magnitude of Cd toxicity depends probably on synergic effects from increased B status, in addition to the own Cd accumulation. Furthermore, disbalances in Mn status (i.e., excess in leaves and deficiency in roots) may enhance Cd toxicity degree. According to data, however, the low magnesium (Mg) status can be linked to tomato tolerance against Cd toxicity. In conclusion, the tomato tolerance degree under short-Cd exposure depends on actively, finely regulation of mineral homeostasis that results in different development of plant organs. The better understanding on the mode of action of Cd toxicity in plants can help in the establishment of strategies to mitigate its impacts on crop yield. (AU)

• Processo FAPESP: 09/54676-0 - Estresse oxidativo induzido por metais: novas abordagens
• Beneficiário: Ricardo Antunes de Azevedo
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/15217-5 - Abordagem integrada de parâmetros anatômicos, fisiológicos, bioquímicos e moleculares para o estudo de mecanismos de tolerância ao cádmio em acessos de tomateiro
• Beneficiário: Marcia Eugenia Amaral de Carvalho
• Modalidade de apoio: Bolsas no Brasil - Doutorado