Consulta: creatorFacets:"Ribeiro,Cleberson"
Registros recuperados: 7
Data/hora: 04/06/2024 17:49:03

Excesso de ferro sobre o crescimento e a composição mineral em Eugenia uniflora L.
Provedor de dados: 124
Autores: Jucoski,Gládis de Oliveira; Cambraia,José; Ribeiro,Cleberson; Oliveira,Juraci Alves de.
RESUMO O ferro, embora micronutriente essencial, quando em excesso pode causar redução no crescimento e, consequentemente, na produtividade das plantas. O objetivo do presente trabalho foi avaliar a absorção, o acúmulo, a distribuição do Fe e suas consequências sobre o crescimento e composição mineral de plantas jovens de Eugenia uniflora L.. As plantas foram expostas às concentrações de Fe 0,045 (controle), 1,0 e 2,0 mM, aplicado na forma de FeEDTA, em solução nutritiva de Hoagland, pH 5,0, durante 15; 30 e 45 dias e, então, foram avaliados o número de folhas, a altura da parte aérea, o comprimento da raiz primária, a massa seca de raízes, caule e folhas e os teores de clorofila, carotenóides totais e minerais. Plantas expostas aos tratamentos com Fe 1,0...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Myrtaceae; Nutrientes minerais; Pitanga; Toxidez de ferro.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000400720

An efficient system for in vitro propagation of Bouchea fluminensis (Vell.) Mold. (Verbenaceae)
Provedor de dados: 39
Autores: Resende,Cristiano Ferrara de; Braga,Virgínia Fernandes; Silva,Cristiane Jovelina da; Pereira,Paula da Fonseca; Ribeiro,Cleberson; Salimena,Fátima Regina Gonçalves; Peixoto,Paulo Henrique Pereira.
This study aimed to establish and propagate in vitro plants of Bouchea fluminensis, a medicinal species known in Brazil as gervão-falso ("false verbena"), evaluating the influences of different growth regulators on in vitro multiplication and rooting stages, as well as examining ex vitro acclimatization of rooted plants. Explants were established on Murashige and Skoog medium at half strength of salts and vitamins without growth regulators. For multiplication, the explants were subjected to combinations of 6-benzyladenine (BA; 0, 2.5, 5.0 and 7.5 µM) and α-naphthalene-acetic acid (NAA; 0, 0.2, 0.4 and 0.6 µM). The medium found to induce the greatest number of shoot was that containing 5 µM of BA (NAA-free). For rooting, we evaluated three auxins (NAA,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Micropropagation; Biodiversity conservation; Espinhaço Mountain Range.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000200005

Role of glutathione in tolerance to arsenite in Salvinia molesta, an aquatic fern
Provedor de dados: 39
Autores: Silva,Adinan Alves da; Oliveira,Juraci Alves de; Campos,Fernanda Vidal de; Ribeiro,Cleberson; Farnese,Fernanda dos Santos.
ABSTRACT In many plant species, tolerance to toxic metals is highly dependent on glutathione, an essential metabolite for cellular detoxification. We evaluated the responses of glutathione metabolism to arsenite (AsIII) in Salvinia molesta, an aquatic fern that has unexplored phytoremediation potential. Plants were exposed to different AsIII concentrations in nutrient solution for 24 h. AsIII caused cell membrane damage to submerged leaves, indicating oxidative stress. There was an increase in the glutathione content and ϒ-glutamylcysteine synthetase enzyme activity in the submerged and floating leaves. The glutathione peroxidase and glutathione sulfotransferase enzymes also showed increased activity in both plant parts, whereas glutathione reductase only...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Arsenic; Glutathione; Macrophytes; Oxidative stress; Phytoremediation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000400657

Efeito do alumínio sobre a absorção, o acúmulo e o fracionamento do fósforo em sorgo
Provedor de dados: 53
Autores: Pereira,Jamil Morais; Cambraia,José; Fonseca Júnior,Élcio Meira da; Ribeiro,Cleberson.
O trabalho teve como objetivo estudar o efeito do Al sobre a absorção, o acúmulo e o fracionamento do P em duas cultivares de sorgo. As plantas foram expostas a níveis tóxicos de Al durante dez dias e, então, colhidas e determinados o crescimento em tamanho e produção de massa seca, os teores de Al e de P total e as diversas formas de P nas duas partes das plantas. Avaliou-se, também, o efeito do Al sobre a absorção de P pelas raízes de plantas intactas. O Al reduziu o crescimento da raiz seminal e a produção de matéria seca de raízes e parte aérea nas duas cultivares, especialmente na sensível. Os teores de Al e de P total aumentaram nas raízes, mas não foram modificados na parte aérea nas duas cultivares. A absorção de P, entretanto, decresceu na...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tolerância ao Al; Sorghum bicolor; Fosfato inorgânico; Fosfato orgânico.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052008000400019

Effects of aluminum on the elongation and external morphology of root tips in two maize genotypes
Provedor de dados: 53
Autores: Souza,Leandro Torres de; Cambraia,José; Ribeiro,Cleberson; Oliveira,Juraci Alves de; Silva,Luzimar Campos da.
ABSTRACT The objective of this study was to evaluate the effects of toxic levels of aluminum (Al) on the growth and external morphology of root tips in two maize genotypes with differential Al tolerance. The maize genotypes UFVM-100 (Al-sensitive) and UFVM-200 (Al-tolerant) were treated with 0 and 50 mM Al in a 0.5 mM CaCl2 solution at pH 4.5; root elongation, Al content and the external morphology of the root tips were evaluated. Chemical analysis, hematoxylin staining and energy dispersive X-ray spectrometry (EDS) showed greater Al accumulation in the root tips of the UFVM-200 genotype. The inhibition of root elongation in the UFVM-100 genotype, however, was much stronger than in the UFVM-200 genotype. Both maize genotypes exhibited visible and intense...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aluminum tolerance; Root growth; Root morphology; Zea mays.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000100019

Cadmium-induced oxidative stress and antioxidative enzyme response in water hyacinth and salvinia
Provedor de dados: 61
Autores: Vestena,Silvane; Cambraia,Jose; Ribeiro,Cleberson; Oliveira,Juraci A.; Oliva,Marco A.
The reactive oxygen species generation, lipid peroxidation and antioxidative enzyme response of water hyacinth and salvinia to Cd were evaluated. Cadmium was absorbed/accumulated mainly in the roots, but significant amounts also translocated to the leaves. No Cd effect on dry weight was detected, although toxicity symptoms were visible. Superoxide and H2O2 concentrations increased, in addition to lipid peroxidation in both species, especially in the leaves of salvinia. In general, antioxidative enzyme activities were reduced in both species following Cd treatment, especially in salvinia. Glutathione peroxidase (GPX, EC 1.11.1.9) activity decreased in water hyacinth but increased in salvinia. Glutathione S-transferase (GST, EC 2.5.1.18) activity increased...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic plants; Eichhornia crassipes; Metal toxicity; Oxidative stress; Salvinia auriculata.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000200005

Antioxidant system response induced by aluminum in two rice cultivars
Provedor de dados: 61
Autores: Ribeiro,Cleberson; Cambraia,José; Peixoto,Paulo Henrique Pereira; Fonseca Júnior,Élcio Meira da.
The antioxidant defense system response was evaluated in two rice cultivars (Oryza sativa L.), Fernandes (CNA-1158) and Maravilha (CNA-6843-1), treated with toxic levels of aluminum. After exposure to aluminum we determined plant growth, H2O2 and O2•- contents, lipid peroxidation, antioxidant enzymes activities and ascorbate and dehydroascorbate contents. Al predominantly accumulated in roots of both cultivars but it reduced root and shoot growth only in the Maravilha cultivar. Treatment with aluminum resulted in a reduction of 84 and 60% in the levels of H2O2 in the roots of the cultivars Maravilha and Fernandes, respectively, and of 26% in the levels of O2•- only in the roots of Fernandes cultivar. Increased lipid peroxidation was observed only in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aluminum; Enzymes; Reactive oxygen species; Oryza sativa; Oxidative stress.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000200004