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

Author(s)

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]

Affiliation

^[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

• Document type: Journal article
• Source: ENVIRONMENTAL AND EXPERIMENTAL BOTANY; v. 155, p. 702-717, NOV 2018.
• Web of Science Citations: 2

Abstract

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)

• FAPESP's process: 14/18735-0 - Root apoplastic and symplastic 111Cd-uptake, oxidative stress and ultra-structural changes in Panicum maximum plants supplied with sulfur
• Grantee: José Lavres Junior
• Support Opportunities: Regular Research Grants
• FAPESP's process: 17/12367-7 - International Plant Nutrition Colloquium - IPNC 2017
• Grantee: José Lavres Junior
• Support Opportunities: Research Grants - Meeting - Abroad
• FAPESP's process: 14/16731-7 - Relationship between sulfur and cadmium (111Cd) detoxification mechanisms in Panicum maximum cv. Tanzania
• Grantee: Flávio Henrique Silveira Rabêlo
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 15/21562-2 - Synthesis of phytochelatins and expression of genes involved in the control of oxidative stress and in the cadmium detoxification in Panicum maximum Jacq. cv. Tanzania supplied with sulfur
• Grantee: Flávio Henrique Silveira Rabêlo
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate