Physiological and biochemical changes in tree seedlings growing in urban forest soil contaminated with copper in Sao Paulo, Brazil

Autor(es)

Siqueira, Matheus Casarini ^[1] ; Kanashiro, Shoey ^[1] ; Domingos, Marisa ^[2] ; Rinaldi, Mirian Cilene Spasiani ^[2] ; Tavares, Armando Reis ^[3]

Afiliação do(s) autor(es)

^[1] Inst Bot, Nucleo Pesquisa Plantas Omamentais, BR-04301902 Sao Paulo, SP - Brazil

^[2] Inst Bot, Nucleo Pesquisa Ecol, BR-04301902 Sao Paulo, SP - Brazil

^[3] Ctr Avancado Pesquisa Tecnol Agronegocio Frutas, Inst Agron, BR-13214820 Jundiai, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLANT AND SOIL; v. 464, n. 1-2, p. 149-163, JUL 2021.
• Citações Web of Science: 2

Resumo

Background and aims Soil pollution by heavy metals is a worldwide environmental concern. Owing to their proximity to sources of anthropogenic emission, urban forest fragments are highly affected by the excessive input of heavy metals into the soil. Thus, this study aimed to assess the physiological and biochemical responses of two native Brazilian Atlantic Forest tree species, Schinus terebinthifolia Raddi (pioneer species) and Eugenia uniflora L. (non-pioneer species), when cultivated in soils contaminated with Cu. Methods Plants were cultivated in soils of an urban forest fragment contaminated with 0 (control), 60, 120, 180 or 240 mg Cu kg(-1) soil. Growth variables, Cu content in plant tissues, translocation index, bioaccumulation factor, pigment contents, leaf gas exchange and chlorophyll fluorescence were all measured to assess physiological alterations resulting from Cu stress, while enzymatic (superoxide dismutase) and nonenzymatic (ascorbic acid and glutathione) antioxidants were quantified to assess the biochemical responses of the species. Results Both species presented high uptake and accumulation of Cu in roots with low translocation rates to shoots; however, S. terebinthifolia showed higher Cu restriction in roots than E. uniflora. S. terebinthifolia and E. uniflora showed distinct responses in growth and leaf gas exchange. Neither enzymatic contents nor oxidative reduction showed any difference between the species. Conclusions The restriction of Cu in roots appears to be the principal protective mechanism against Cu phytotoxicity, preventing negative effects on the physiological and biochemical status of the species. S. terebinthifolia shows potential as a Cu phytostabilizer. (AU)

• Processo FAPESP: 17/50341-0 - Desafios para conservação da biodiversidade frente às mudanças climáticas, poluição e uso e ocupação do solo (PDIp)
• Beneficiário: Luiz Mauro Barbosa
• Modalidade de apoio: Auxílio à Pesquisa - Programa Modernização de Institutos Estaduais de Pesquisa
• Processo FAPESP: 19/03105-4 - Efeito de diferentes concentrações de cobre no crescimento e desenvolvimento de espécies arbóreas nativas da Mata Atlântica
• Beneficiário: Matheus Casarini Siqueira
• Modalidade de apoio: Bolsas no Brasil - Mestrado