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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 11
[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
Total Affiliations: 5
Document type: Journal article
Web of Science Citations: 0

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)

FAPESP's process: 15/05942-0 - Shedding light on the metabolism of nanomaterials absorbed by plants with X-ray and vibrational spectroscopy
Grantee:Hudson Wallace Pereira de Carvalho
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 16/19937-0 - Selenium application forms in upland rice plants aiming agronomic biofortification and improvement of grain nutritional quality
Grantee:Eduardo Henrique Marcandalli Boleta
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 15/19121-8 - Multi-User Equipment approved in grant 2015/05942-0: micro X-Ray Fluorescence system
Grantee:Hudson Wallace Pereira de Carvalho
Support Opportunities: Multi-user Equipment Program