Selenium toxicity in upland field-grown rice: Seed physiology responses and nutrient distribution using the mu-XRF technique

Autor(es):Mostrar menos -

dos Reis, Andre Rodrigues ^[1] ; Marcandalli Boleta, Eduardo Henrique ^[2] ; Alves, Charline Zaratin ^[3] ; Cotrim, Mayara Favero ^[3] ; Barbosa, Julierme Zimmer ^[4] ; Silva, Vinicius Martins ^[2] ; Porto, Rafael Lawandovski ^[2] ; Dantas Bereta Lanza, Maria Gabriela ^[1] ; Lavres, Jose ^[5] ; Feresin Gomes, Marcos Henrique ^[5] ; Pereira de Carvalho, Hudson Wallace ^[5]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Rua Domingos Costa Lopes 780, BR-17602496 Tupa, SP - Brazil

^[2] Sao Paulo State Univ UNESP, BR-15385000 Ilha Solteira, SP - Brazil

^[3] Fed Univ Mato Grosso do Sul UFMS, Rodovia MS 306, BR-79560000 Chapadao Do Sul, MS - Brazil

^[4] Fed Inst Southeast Minas Gerais, Rua Monsenhor Jose Augusto 204, BR-36205018 Barbacena, MG - Brazil

^[5] Univ Sao Paulo, Av Centenario 303, BR-13400970 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY; v. 190, MAR 1 2020.
• Citações Web of Science: 0

Resumo

Selenium (Se) is an essential element for human and animal, although considered beneficial to higher plants. Selenium application at high concentration to plants can cause toxicity decreasing the physiological quality of seeds. This study aimed to characterize the Se toxicity on upland rice yield, seed physiology and the localization of Se in seeds using X-ray fluorescence microanalysis (mu-XRF). In the flowering stage, foliar application of Se (0, 250, 500, 1000, 1500, 2000 g ha(-1)) as sodium selenate was performed. A decrease in rice yield and an increase in seed Se concentrations were observed from 250 g Se ha(-1). The storage proteins in the seeds showed different responses with Se application (decrease in albumin, increase in prolamin and glutelin). There was a reduction in the concentrations of total sugars and sucrose with the application of 250 and 500 g Se ha(-1). The highest intensities K alpha counts of Se were detected mainly in the endosperm and aleurone/pericarp. mu-XRF revealed the spatial distribution of sulfur, calcium, and potassium in the seed embryos. The seed germination decreased, and the electrical conductivity increased in response to high Se application rates showing clearly an abrupt decrease of physiological quality of rice seeds. This study provides information for a better understanding of the effects of Se toxicity on rice, revealing that in addition to the negative effects on yield, there are changes in the physiological and biochemical quality of seeds. (AU)

• 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
• Processo FAPESP: 16/19937-0 - Formas de aplicação de selênio no arroz de terras altas visando a biofortificação agronômica e qualidade nutricional do grão
• Beneficiário: Eduardo Henrique Marcandalli Boleta
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 15/19121-8 - EMU concedido no processo 2015/05942-0: sistema de microfluorescência de Raios X
• Beneficiário: Hudson Wallace Pereira de Carvalho
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários