Manganese hyperaccumulation capacity of Ilex paraguariensis A. St. Hil. and occurrence of interveinal chlorosis induced by transient toxicity.

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 accumulate Mn and the effect of excessive concentrations on plant growth and nutrition. 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 1,080 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. 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 7203 and 8030 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 Mn presence in the mesophyll, primarily 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.

Bibliographic Details

Main Authors:	MAGRI, E., GUGELMIN, E. K., GRABARSKI, F. A. P., BARBOSA, J. Z., AULER, A. C., WENDLING, I., PRIOR, S. A., VALDUGA, A. T., MOTTA, A. C. V.
Other Authors:	EDERLAN MAGRI, UNIVERSIDADE FEDERAL DO PARANÁ; EDUARDO KIERAS GUGELMIN, UNIVERSIDADE FEDERAL DO PARANÁ; FELIPE AUGUSTO PIACENTINI GRABARSKI, UNIVERSIDADE FEDERAL DO PARANÁ; JULIERME ZIMMER BARBOSA, INSTITUTO FEDERAL DO SUDESTE DE MINAS GERAIS; ANDRÉ CARLOS AULER, UNIVERSIDADE FEDERAL DO PARANÁ; IVAR WENDLING, CNPF; STEPHEN ARTHUR PRIOR, USDA-ARS NATIONAL SOIL DYNAMICS LABORATORY; ALICE TERESA VALDUGA, UNIVERSIDADE REGIONAL INTEGRADA DO ALTO URUGUAI E DAS MISSÕES; ANTÔNIO CARLOS VARGAS MOTTA, UNIVERSIDADE FEDERAL DO PARANÁ.
Format:	Artigo de periódico biblioteca
Language:	eng
Published:	2024-07-09
Subjects:	Nutritional imbalance, X-ray microanalysis, Ilex Paraguariensis, Manganês, Composição Química, Solo Ácido, Nutrição Vegetal, Yerba mate, Elemental composition, Manganese,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1165601 https://doi.org/10.1016/j.ecoenv.2020.111010
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