Please use this identifier to cite or link to this item:
metadata.artigo.dc.title: Bioaccumulation and effects of lanthanum on growth and mitotic index in soybean plants
metadata.artigo.dc.creator: Oliveira, Cynthia de
Ramos, Sílvio Júnio
Siqueira, José Oswaldo
Faquin, Valdemar
Castro, Evaristo Mauro de
Techio, Vânia Helena
Coelho, Livia Cristina
Silva, Pedro H. P. e
Schnug, Ewald
Guilherme, Luiz Roberto Guimarães
metadata.artigo.dc.subject: Soybean - Effect of lanthanum
Rare earth elements - Bioaccumulation
Soja - Efeito do lantânio
Elementos terras raras - Bioacumulação
metadata.artigo.dc.publisher: Elsevier Dec-2015
metadata.artigo.dc.identifier.citation: OLIVEIRA, C. de et al. Bioaccumulation and effects of lanthanum on growth and mitotic index in soybean plants. Ecotoxicology and Environmental Safety, [New York], v. 122, p. 136-144, Dec. 2015.
metadata.artigo.dc.description.abstract: Rare earth elements such as lanthanum (La) have been used as agricultural inputs in some countries in order to enhance yield and improve crop quality. However, little is known about the effect of La on the growth and structure of soybean, which is an important food and feed crop worldwide. In this study, bioaccumulation of La and its effects on the growth and mitotic index of soybean was evaluated. Soybean plants were exposed to increasing concentrations of La (0, 5, 10, 20, 40, 80, and 160 µM) in nutrient solution for 28 days. Plant response to La was evaluated in terms of plant growth, nutritional characteristics, photosynthetic rate, chlorophyll content, mitotic index, modifications in the ultrastructure of roots and leaves, and La mapping in root and shoot tissues. The results showed that the roots of soybean plants can accumulate sixty-fold more La than shoots. La deposition occurred mainly in cell walls and in crystals dispersed in the root cortex and in the mesophyll. When La was applied, it resulted in increased contents of some essential nutrients (i.e., Ca, P, K, and Mn), while Cu and Fe levels decreased. Moreover, low La concentrations stimulated the photosynthetic rate and total chlorophyll content and lead to a higher incidence of binucleate cells, resulting in a slight increase in roots and shoot biomass. At higher La levels, soybean growth was reduced. This was caused by ultrastructural modifications in the cell wall, thylakoids and chloroplasts, and the appearance of c-metaphases.
metadata.artigo.dc.language: en_US
Appears in Collections:DBI - Artigos publicados em periódicos

Files in This Item:
There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.