Open Access

ARTICLE

Impact of selenium fertilization on the activity of detoxifying enzymes of H₂O₂ in bean plants

by Hermosillo-Cereceres MA¹, E Sánchez¹, E Muñoz-Márquez¹, A Guevara-Aguilar¹, M García-Bañuelos¹, D Ojeda-Barrios²

1 Centro de Investigación en Alimentación y Desarrollo A.C. - Unidad Delicias “Tecnología de Productos Hortofrutícolas y Lácteos”, Av. 4a Sur 3820, Fraccionamiento Vencedores del Desierto, Cd. Delicias, Chihuahua, México. C.P. 33089.
2 Facultad de Ciencias Agrotecnológicas de la Universidad Autónoma de Chihuahua, México.

* Corresponding Author:Address Correspondence to: Esteban Sánchez, e-mail:

Phyton-International Journal of Experimental Botany 2014, 83(all), 347-352. https://doi.org/10.32604/phyton.2014.83.347

Abstract

Selenium (Se) is an essential element for many organisms, although in high concentrations it may become toxic, leading to the generation of reactive oxygen species (ROS). In this study, bean plants received different application rates of Se (0, 10, 20, 40, 80, and 160 µM) in the form of selenite and selenate to evaluate the activity of the detoxifying enzymes of H₂O₂. The results indicated that the activity of these enzymes in bean plants depended on the chemical form of Se: selenite at rates of 20 µM or greater diminished biomass and yield, increasing the activity of superoxide dismutase (SOD). Even when catalase (CAT) activity also increased, it appeared that it was efficient at detoxifying H₂O₂ in the presence of Se, given also the rise in H₂O₂ production. Also, selenate diminished yield up to a rate of 160 µM and increased the activity of the enzyme GSH-Px, which reached its maximum activity at 160 µM, and thus proved less toxic than selenite.

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Keywords

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