Selenato e selenito na produção e biofortificação agronômica com selênio em arroz

Abstract

Resumo -O objetivo deste trabalho foi avaliar o efeito da aplicação de doses de selenato e selenito na biofortificação de arroz (Oryza sativa) com Se, bem como a influência dessas formas de Se nos teores de P, S, Fe e Zn nos grãos. O experimento foi conduzido em casa de vegetação, em vasos com 4 dm 3 de um Latossolo Vermelho-Amarelo distrófico, de textura média, em arranjo fatorial 5x2, com cinco doses de Se (0, 0,75, 1,50, 3,0 e 6,0 mg dm -3 ) e duas formas de Se (selenato e selenito). Observou-se que o selenato proporcionou maior eficiência na absorção de Se pelas raízes, aproveitamento pela planta, translocação para a parte aérea e teor desse elemento nos grãos. A aplicação do selênio na adubação altera os teores de P, S e Zn, mas não afeta os de Fe nos grãos de arroz.Termos para indexação: arroz enriquecido, aproveitamento de selênio, segurança alimentar, selenato, selenito. Selenate and selenite on yield and agronomic biofortification with selenium in riceAbstract -The objective of this work was to evaluate the effect of doses of selenate and selenite on rice (Oryza sativa) biofortification with Se, as well the influence of these forms of Se in the levels of P, S, Fe, and Zn in grains. The experiment was conducted in a greenhouse, in pots with 4 dm 3 of a sandy clay loam Latosol, with medium texture, in a 5x2 factorial arrangement with five doses of Se (0, 0.75, 1.50, 3.0, and 6.0 mg dm -3 ) and two forms of Se (selenate and selenite). Selenate provided greater efficiency of root uptake of Se, plant-use efficiency, translocation from roots to shoots, and content of this element in rice grains. The application of Se during fertilization influences the levels of P, S, and Zn, but does not affect those of Fe in rice grains.

Genotypic Variation and Biofortification with Selenium in Brazilian Wheat Cultivars

“…2B). This high efficiency regarding Se uptake and transportation by the xylem has been reported in several studies (Sharma et al, 2010; Ramos et al, 2011; Boldrin et al, 2012).…”

“…3D). The synergistic effect between selenate and sulfate has been previously reported (White et al, 2004;Ramos et al, 2011;Boldrin et al, 2012;Sousa et al, 2013). The evaluation of the nutrient content in the grains revealed significant (p £ 0.05) interaction between cultivars and Se only for the S content (Fig.…”

Effects of selenium (Se) application and arbuscular mycorrhizal (AMF) inoculation on soybean (Glycine max) and forage grass (Urochloa decumbens) development in oxisol

“…Mycorrhizal plants could take up more metal nutrients via extraradical hyphae, which provide larger surface areas than the roots alone and reduce the distance for diffusion, thereby enhancing the absorption of immobile metal nutrients (Jakobsen et al, 1992). Previous studies without AMF inoculation found a decrease level of Micronutrients, when Se was applied in rice and forage grass (Boldrin et al, 2012;Ramos et al, 2012).…”

Rice Biofortification With Zinc and Selenium: A Transcriptomic Approach to Understand Mineral Accumulation in Flag Leaves

“…Additionally, in the case of the combined Zn and Se application, the BP associated with carbohydrate metabolism and lipid dynamics were also enriched. Such distinct GO profiles are likely related to the specific roles of Se and Zn in plant functioning as well as with specificities of Zn and Se biofortification processes, even considering a certain antagonism extent between these two minerals as regards their accumulation potential (Boldrin et al, 2012;Mangueze et al, 2018). This hypothesis is supported by the classification based on the MF, i.e., ion homeostasis in Se-biofortified flag leaves, probably related to the role of this mineral in controlling oxidative stress, the coenzyme/cofactor function of Zn in Zn-biofortified flag leaves, and a rather diverse set of GOs in the double biofortified flag leaves (Sunde, 2018).…”