Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/28209
Title: Qualidade fisiológica de sementes de soja, milho e tomate expostas a cério e cério combinado com fósforo
Other Titles: Physiological quality of soybean, corn and tomato seeds exposed to a cerium and cerium combined with phosphorus
Authors: Guilherme, Luiz Roberto Guimarães
Downie, Allan Bruce
Silva, Vânia Aparecida
Oliveira, Cynthia de
Faquin, Valdemar
Guimarães, Renato Mendes
Keywords: Solos – Teor de elementos terras raras
Soja – Germinação – Efeito do cério
Tomate – Germinação – Efeito do cério
Milho – Germinação – Efeito do cério
Soils – Rare earth elements content
Soybean – Germination – Effect of cerium
Tomatoes – Germination – Effect of cerium
Corn – Germination – Effect of cerium
Glycine max
Solanum lycopersicum
Zea mays
Issue Date: 6-Dec-2017
Publisher: Universidade Federal de Lavras
Citation: KRÜGER, F. de O. Qualidade fisiológica de sementes de soja, milho e tomate expostas a cério e cério combinado com fósforo. 2017. 47 p. Tese (Doutorado em Agronomia/Fisiologia Vegetal)-Universidade Federal de Lavras, Lavras, 2017.
Abstract: The rare earth elements are a group of 17 chemical elements, with 15 of them belonging to the group of lanthanides, in addition to scandium and yttrium. Cerium is the most abundant of the REEs, being present in the earth's crust in concentrations as high as those of the micronutrients copper and zinc. For decades, REEs have been a subject of interest, due to their use in various segments of industry and agriculture. In agriculture, the use of REEs has been taking place since 1970 in countries like China, which was the first country to recommend the use of fertilizers containing REEs. In Brazil, the use of REEs is done indirectly through phosphate fertilizers and soil conditioners, such as phosphogypsum. The long-term use of fertilizers is a major source of REEs to the soil. Therefore, the continuous use and application of them can increase significantly the concentrations of REEs in soils. This scenario speaks for the need of studies to verify the physiological responses of soybeans, maize, and tomato seeds when exposed to these elements throughout the germination process, as well as to check which concentrations might have possible positive effects on the physiological quality of these seeds, since these three crops are very demanding in fertilization, mainly with phosphorus. The objective of this study was to evaluate the physiological quality of soybean, corn, and tomato seeds exposed to different concentrations of cerium, either alone or combined with phosphorus. With that, we hope to aggregate additional information that may contribute to unraveling the role of ETRs in plant metabolism, which is still not well known in the world literature. The seeds of these three species were submitted to four concentrations of cerium nitrate and two concentrations of phosphorus. These concentrations were added on the germinating paper in the amount equivalent to 2.5 times the dry mass of the paper and subsequently submitted to the tests for the physiological quality assessments. It can be concluded with this work that the exposure of corn, soybean, and tomato seeds to concentrations of 0.8; 3; 14 and 57 μmol L-1 Ce3+ and Ce combined with 435 and 2608 μmol L-1 P showed no increase in germination and vigor.
URI: http://repositorio.ufla.br/jspui/handle/1/56399209
Appears in Collections:Agronomia/Fisiologia Vegetal - Doutorado (Teses)



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