Relationship between manganese toxicity and waterlogging tolerance in Zea mays L. cv. Saracura

• Published in: Acta scientiarum. Agronomy Vol. 39; no. 1; pp. 75 - 82
• Main Authors: Silva, Dayane Meireles da, Fonte, Nathalia Dos Santos da, Souza, Kamila Rezende Dázio de, Rodrigues-Brandão, Isabel, Libeck, Ian Teodoro, Alves, Jose Donizeti
• Format: Journal Article
• Language: English; Portuguese
• Published: Maringa Editora da Universidade Estadual de Maringá - EDUEM 01.01.2017; Eduem (Editora da Universidade Estadual de Maringá)
• Subjects: AGRONOMY; Chlorophyll; Corn; Hypoxia; Manganese compounds; Oxidative stress; Toxicity; chlorophyll; hypoxia; estresse oxidativo; clorofila; oxidative stress
• ISSN: 1679-9275; 1807-8621; 1807-8621
• DOI: 10.4025/actasciagron.v39i1.30997

The objective of this study was to evaluate the relationship between excess manganese and waterlogging tolerance in 18th selection cycle Zea mays L. cv. Saracura plants. Maize plants were transferred to plastic receptacles containing solutions with different concentrations of manganese. Leaves and roots were evaluated at the beginning of treatment and after 7, 14, and 21 days for chlorophyll content, biomass production and antioxidant metabolism. Mn was strongly translocated from the roots to the leaves, triggering a decrease in chlorophyll content. Excess Mn promoted an increase in reactive oxygen species that was accompanied by higher levels of antioxidative enzyme activity and lipid peroxidation. Zea mays L. cv. Saracura efficiently sequestered relatively large amounts of Mn in the leaves, with a significant impact on metabolism; however, we did not observe visual symptoms or a large decrease in biomass production.