Consulta: creatorFacets:"Carvalho,Rogério Falleiros"
Registros recuperados: 4
Data/hora: 09/06/2024 04:45:50

Seed priming with hormones does not alleviate induced oxidative stress in maize seedlings subjected to salt stress
Provedor de dados: Scientia Agricola
Autores: Carvalho,Rogério Falleiros; Piotto,Fernando Angelo; Schmidt,Daiana; Peters,Leila Priscila; Monteiro,Carolina Cristina; Azevedo,Ricardo Antunes.
Seed priming with hormones has been an efficient method for increasing seed vigor as well as seedling growth under stressful conditions. These responses have in the past been attributed to the activation of antioxidant systems in a range of crops. The results described in this work show that hormonal priming with methyl jasmonate, salicylic acid or CEPA (chloroethylphosphonic acid), an ethylene (ET) releaser, does not induce the antioxidant activity of superoxide dismutase, catalase, ascorbate peroxidase or glutathione reductase in maize seedlings subjected to salt stress. The enhanced biomass of maize seedlings under salt stress that was observed only from ET priming indicates that the stress tolerance in maize from ethylene priming is a fundamental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Antioxidant systems; Hormonal pretreatment; Salinity; Seedling growth.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500014

Potential of hydrogen (pH) differentially modulates cadmium stress response in abscisic acid-deficient sitiens tomato mutant
Provedor de dados: Bragantia
Autores: Pompeu,Georgia Bertoni; Ambrosano,Guilherme Bovi; Vilhena,Milca Bartz; Carvalho,Rogério Falleiros; Gratão,Priscila Lupino; Andrino,Felipe; Lira,Simone Possedente de; Azevedo,Ricardo Antunes.
ABSTRACT Uptake of nutrients and cadmium (Cd) are dependent upon many factors, including plant species, ions concentration and pH. Tolerance to Cd-induced oxidative stress can be modulated by phytohormones such as abscisic acid (ABA), which induce the production of reactive oxygen species, activating proteins and enzymes involved in stress response and possibly stress tolerance. The present study aimed to evaluate the biochemical variations induced by Cd in ABA-deficient sitiens tomato mutant (sit) and its wild-type counterpart, Micro-Tom (MT), grown at different pH conditions. The plants were cultivated in nutrient solution (pH 5, 6 and 7; 20-days) and were then further grown over a 48-h period in 0 or 50 ?M CdCl2 at pH 6. Before Cd addition, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antioxidant enzymes; Micro-Tom; Mineral nutrition; Oxidative stress; Solanum lycopersicum.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300317

The role of phytochromes in cadmium stress responses in tomato
Provedor de dados: Bragantia
Autores: Gaion,Lucas Aparecido; Lorevice,Paulo Guilherme; Monteiro,Carolina Cristina; Gavassi,Marina Alves; D’Amico-Damião,Victor; Gratão,Priscila Lupino; Gasparino,Eduardo Custódio; Carvalho,Rogério Falleiros.
ABSTRACT It is well known that phytochromes mediate a wide range of photomorphogenic processes in plants. In addition, many studies have demonstrated the involvement of phytochromes as part of abiotic stress signaling responses. However, little is known about cadmium (Cd) stress regulation by phytochromes. Thus, in this study, we used the phyA (far red-insensitive; fri), phyB1 (temporary redinsensitive; tri) and phyB2 (phyB2) tomato (Solanum lycopersicum L.) mutants to investigate the roles of these three phytochromes on Cd stress responses. The plants were grown over a 21-d period in the presence of Cd. We evaluated plant growth, Cd and chlorophyll content and anatomical changes in the leaves. The results indicated that all genotypes were affected by Cd...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abiotic stress; Heavy metal; Mutants; Plant anatomy; Solanum lycopersicum. L.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000100013

Compostos fenólicos e capacidade antioxidante em frutos de tomateiros mutantes fotomorfogenéticos
Provedor de dados: Ciência Rural
Autores: Dias,Tiago; Melo,Hyrandir Cabral de; Alves,Frederico Rocha Rodrigues; Carvalho,Rogério Falleiros; Carneiro,Karla da Silva; Sousa,Cleiton Mateus.
Compostos fenólicos e capacidade antioxidante são mecanismos de defesa das plantas aos danos do estresse oxidativo. Os compostos fenólicos são sintetizados pela via dos fenilpropanoides, cuja enzima chave, fenilalanina amônia liase, é influenciada pela luz e ação de fotorreceptores, como o fitocromo. O objetivo do presente trabalho é avaliar a concentração de compostos fenólicos e a capacidade antioxidante de frutos de microtomateiro selvagem, cultivar "Micro-Tom" (MT), e seus mutantes fotomorfogenéticos high pigment 1 (hp1), super-responsivo a eventos mediados por luz e aurea (au), deficiente quantitativo em fitocromos. Vinte frutos maduros de cada genótipo (MT, hp1 e au) foram utilizados para as análises, realizadas em triplicata. Para quantificação dos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Áurea; Fitocromo; Hp1; Solanum lycopersicum L.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000500782