Enzymatic antioxidants-Relevant or not to protect the photosynthetic system against cadmium-induced stress in Massai grass supplied with sulfur?

Autor(es)

Silveira Rabelo, Flavio Henrique ^{[1, 2]} ; Borgo, Lucelia ^{[2, 3]} ; Keunen, Els ^[2] ; dos Reise, Andre Rodrigues ^[8] ; Martinelli, Adriana Pinheiro ^[1] ; Cuypers, Ann ^[2] ; Lavres, Jose ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Nucl Energy Agr, BR-13416000 Piracicaba - Brazil

^[2] Hasselt Univ, Ctr Environm Sci, B-3590 Diepenbeek - Belgium

^[3] Univ Sao Paulo, Luiz de Queiroz Coll Agr, BR-13418900 Piracicaba - Brazil

^[4] Sao Paulo State Univ, BR-17602496 Tupa - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL AND EXPERIMENTAL BOTANY; v. 155, p. 702-717, NOV 2018.
• Citações Web of Science: 2

Resumo

Exposure to cadmium (Cd) can cause oxidative stress and injuries to the photosynthetic apparatus of plants. Otherwise, plant metabolism impaired by Cd toxicity can be aided by a proper sulfur (S) nutrition, since S is a component of antioxidants and photosynthetic systems. In this sense, our aim in this study was to evaluate the effect of S supply (0.1, 1.9 and 3.7 mmol L-1) on the antioxidant and photosynthetic systems of Massai grass exposed to Cd (0.0, 0.1 and 0.5 mmol L-1) as a prerequisite for studies of Cd phytoextraction. Plants supplied with 3.7 mmol L-1 S showed the lowest growth and the highest Cd concentrations when exposed to 0.5 mmol L-1 Cd. However, Massai grass grown without S deprivation showed the highest GSH + GSSG concentrations in all tissues and the lowest lipid peroxidation in stems and sheaths and roots. In general, the activities of SOD, CAT, APX, GPOX and GR did not increase in Massai grass exposed to Cd, even with proper S supply. Severe Cd exposure halted the photosynthetic system of Massai grass, although well-nourished plants with S exhibited greatest photosynthetic rate probably due to the action of GSH in the control of the oxidative stress. (AU)

• Processo FAPESP: 14/18735-0 - Absorção radicular apoplástica e simplástica de 111Cd, estresse oxidativo e alterações ultra-estruturais em plantas de Panicum maximum supridas com enxofre
• Beneficiário: José Lavres Junior
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/12367-7 - International Plant Nutrition Colloquium - IPNC 2017
• Beneficiário: José Lavres Junior
• Modalidade de apoio: Auxílio à Pesquisa - Reunião - Exterior
• Processo FAPESP: 14/16731-7 - Relação entre enxofre e os mecanismos de detoxificação de cádmio (111Cd) em plantas de Panicum maximum cv. Tanzânia
• Beneficiário: Flávio Henrique Silveira Rabêlo
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 15/21562-2 - Síntese de fitoquelatinas e expressão de genes envolvidos no controle do estresse oxidativo e na detoxificação de cádmio em Panicum maximum Jacq. cv. Tanzânia suprido com enxofre
• Beneficiário: Flávio Henrique Silveira Rabêlo
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado