Foliar application of rare earth elements on soybean (Glycine max (L)): Effects on biometrics and characterization of phytotoxicity

Autor(es)

Rodrigues, Eduardo S. ^[1] ; Montanha, Gabriel S. ^[1] ; Marques, Joao P. R. ^[1] ; de Almeida, Eduardo ^[1] ; Yabuki, Lauren N. M. ^[2] ; Menegario, Amauri A. ^[2] ; Pereira de Carvalho, Hudson W. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Ctr Nucl Energy Agr CENA, Lab Nucl Instrumentat LIN, BR-13416000 Piracicaba, SP - Brazil

^[2] Sao Paulo State Univ UNESP, Environm Studies Ctr, BR-13506900 Rio Claro, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF RARE EARTHS; v. 38, n. 10, p. 1131-1139, OCT 2020.
• Citações Web of Science: 0

Resumo

This study aims at investigating the effects of foliar application of aqueous solutions of La3+ and Ce3+ nitrates on soybean plants (Glycine max). First, we observe that Triton HW 1000 surfactant at 0.01 vol% reduces droplets contact angle and increases their drying time. Under greenhouse conditions, the foliar treatments do not affect chlorophyll content, plant height, number of leaves, number of pods, number of seeds per pod, and average seed weight. However, the treatments induce phytotoxicity since foliar injuries appear after the spraying. Microprobe X-ray fluorescence spectroscopy combined to scanning electron microscopy shows that the leaf lesions are positively correlated to accumulation of Ce and La on the leaf surface and also promote structural alteration to the epidermal cells. X-ray absorption near edge structure shows that the La and Ce nitrates are partially bio transformed into oxides by the leaves which might explain the harmful effects. (C) 2020 Published by Elsevier B.V. on behalf of Chinese Society of Rare Earths. (AU)

• Processo FAPESP: 17/16375-4 - Efeitos da aplicação foliar de La e Ce em plantas de soja
• Beneficiário: Eduardo Santos
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 15/05942-0 - Investigação do metabolismo de nanomateriais absorvidos por plantas empregando-se espectroscopias vibracional e de Raios X
• Beneficiário: Hudson Wallace Pereira de Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores