Physiological, hormonal and metabolic alterations caused by selenium in rice seedlings
type: CreativeWork
description: Selenium (Se) can alter the growth of some plant species and causes changes in levels of plant hormones, such as auxin and ethylene. However, the impact of Se supply on relationships between hormones biosynthesis and primary metabolism during growth of rice (Oryza sativa L.) seedlings is poorly understood. Thus, the hypothesis that Se induces changes in the interactions between auxin and ethylene to modulate primary metabolism and growth of rice seedlings was investigated. The application of selenite did not affect the of growth shoot of seedlings, but promoted the elongation of the primary root with reduction in the number and length of the lateral roots. There was a decrease in the concentrations of ethylene, 1- aminocyclopropane-1-carboxylic acid (ACC) and indole-3-acetic acid (IAA) in roots of rice seedlings treated with selenite as compared with the control. Selenite led to decreased expression of genes associated with the biosynthesis of auxin and ethylene, concomitantly with reduced production of these hormones by the roots. Moreover, selenite decreased the abundance of transcripts encoding auxin transport proteins. Treatment with IAA overrode the repressive effect of selenite on lateral root growth. The ethylene synthesis inhibitor L-α-(2- aminoethoxyvinyl)-glycine (AVG) increased elongation of primary root, whereas the ethylene precursor ACC resulted in the opposite effect. Moreover, soluble sugars accumulate in roots under selenite treatment. Together, these findings suggest that selenite affects primary and lateral root development by blocking ethylene and auxin biosynthesis, respectively. Experiments with organic Se showed that seleno-L-methionine (SeMet) at low concentration increased concentrations of hydrogen peroxide and superoxide anion production, inhibiting auxin biosynthesis and increasing ethylene production in both shoot and root. The effect of SeMet on seedlings was mediated by the inhibition of the abundance of transcripts encoding auxin tran…
abstract: Selenium (Se) can alter the growth of some plant species and causes changes in levels of plant hormones, such as auxin and ethylene. However, the impact of Se supply on relationships between hormones biosynthesis and primary metabolism during growth of rice (Oryza sativa L.) seedlings is poorly understood. Thus, the hypothesis that Se induces changes in the interactions between auxin and ethylene to modulate primary metabolism and growth of rice seedlings was investigated. The application of selenite did not affect the of growth shoot of seedlings, but promoted the elongation of the primary root with reduction in the number and length of the lateral roots. There was a decrease in the concentrations of ethylene, 1- aminocyclopropane-1-carboxylic acid (ACC) and indole-3-acetic acid (IAA) in roots of rice seedlings treated with selenite as compared with the control. Selenite led to decreased expression of genes associated with the biosynthesis of auxin and ethylene, concomitantly with reduced production of these hormones by the roots. Moreover, selenite decreased the abundance of transcripts encoding auxin transport proteins. Treatment with IAA overrode the repressive effect of selenite on lateral root growth. The ethylene synthesis inhibitor L-α-(2- aminoethoxyvinyl)-glycine (AVG) increased elongation of primary root, whereas the ethylene precursor ACC resulted in the opposite effect. Moreover, soluble sugars accumulate in roots under selenite treatment. Together, these findings suggest that selenite affects primary and lateral root development by blocking ethylene and auxin biosynthesis, respectively. Experiments with organic Se showed that seleno-L-methionine (SeMet) at low concentration increased concentrations of hydrogen peroxide and superoxide anion production, inhibiting auxin biosynthesis and increasing ethylene production in both shoot and root. The effect of SeMet on seedlings was mediated by the inhibition of the abundance of transcripts encoding auxin tran…
author: Malheiros, Rafael Soares Pozzi
language: eng
keywords: Hormônios vegetais, Controle hormonal, Metabolismo, Plântulas
date published: 2019-07-30
date modified: 2026-07-24T01:21:41Z
provider: Brazil UFV
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Universidade Federal de Viçosa