Location: Soil Dynamics ResearchTitle: Manganese hyperaccumulation capacity of Ilex paraguariensis A. St. Hil. and occurrence of interveinal chlorosis induced by transient toxicity
|MAGRI, EDERLAN - Universidade Federal Do Parana|
|GUGELMIN, EDUARDO - Universidade Federal Do Parana|
|GRABARSKI, FELIPE - Universidade Federal Do Parana|
|BARBOSA, JULIERME - Federal University Of Minas Gerais|
|AULER, ANDRE - Universidade Federal Do Parana|
|WENDLING, IVAR - Brazilian Agricultural Research Corporation (EMBRAPA)|
|Prior, Stephen - Steve|
|VALDUGA, ALICE - Regional Integrated University Of Alto Uruguai And Missões(URI)|
|MOTTA, ANTONIO - Universidade Federal Do Parana|
Submitted to: Ecotoxicology and Environmental Safety
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 7/9/2020
Publication Date: 7/27/2020
Citation: Magri, E., Gugelmin, E., Grabarski, F., Barbosa, J., Auler, A., Wendling, I., Prior, S.A., Valduga, A., Motta, A. 2020. Manganese hyperaccumulation capacity of Ilex paraguariensis A. St. Hil. and occurrence of interveinal chlorosis induced by transient toxicity. Ecotoxicology and Environmental Safety. 203:111010. http://doi.org/10.1016/j.ecoenv.2020.111010.
Interpretive Summary: Manganese (Mn) toxicity is common in plants grown on very acid soils. But, some plants, such as yerba mate (which is used in various products), can take up high amounts of Mn (hyper-accumulating) under these conditions. However, it is not well known how growth and tissue Mn levels of yerba mate will change due to soil origin and lime/fertilizer applications. This study evaluated yerba mate under different soil, fertility, and Mn application conditions. Liming reduces leaf Mn levels and had a negative effect on growth, possibly due to large reductions in Mn absorption. Under high Mn, interveinal chlorosis appeared in early leaf development but disappears as leaves matured. However, the occurrence of this symptom was not associated with decreased plant growth.
Technical Abstract: Manganese (Mn) toxicity is common in plants grown on very acid soils. However, some plants species that grow in this condition can take up high amounts of Mn and are referred to as hyperaccumulating species. In this study, we evaluated the capacity of Ilex paraguariensis to absorb Mn under different degrees of availability as a result of different soil parent material, soil pH (liming), and applied Mn doses. For this, a container experiment was conducted using soils from different parent materials (basalt and sandstone), with and without liming, and at six doses of applied Mn (0, 30, 90, 270, 540 and 1080 mg kg-1). Clonal plants grown for 203 days were harvested to evaluate yield, and leaf tissue samples were evaluated for Mn and other elements. Under high availability conditions without liming and with high Mn doses, leaf Mn concentrations reached 13,452 and 12,127 mg kg-1 in sandstone and basalt soils, respectively; concentrations in excess of 10,000 mg kg-1 are characteristic of hyperaccumulating plants. Liming reduced these values to 7,203 and 8,030 mg kg-1. More plant growth accompanied increased Mn leaf concentrations, with a growth reduction noted at the highest dose in unlimed soils. Elemental distribution showed similar patterns of Mn, K, and Al in vascular bundles, without high Mn precipitates. Interveinal chlorosis of young leaves associated with high Mn concentration and lower Fe concentrations was observed, especially in sandstone soil without liming. However, the occurrence of this symptom was not associated with decreased plant growth.