Navegando por Autor "Oliveira, Lucilene Silva de"

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Longevidade de inflorescências de Epidendrum ibaguense tratadas com aminoetoxivinilglicina
(Pesquisa Agropecuária Brasileira, 2009-03) Mapeli, Ana Maria; Finger, Fernando Luiz; Oliveira, Lucilene Silva de; Barbosa, José Geraldo
O objetivo deste trabalho foi avaliar a influência do inibidor da síntese de etileno aminoetoxivinilglicina (AVG) aplicado na forma de solução de condicionamento e pulverização sobre a abscisão e longevidade de inflorescências de Epidendrum ibaguense Kunth. As hastes foram colhidas e imediatamente condicionadas em solução com 0, 0,5, 1, 1,5 e 2 mM de AVG por 6, 12, 18 e 24 horas. Os mesmos tratamentos foram aplicados na forma de pulverização até o molhamento completo da inflorescência. O experimento foi conduzido em um esquema fatorial entre tempo de aplicação e doses de AVG, mais doses de AVG aplicadas em pulverização nas flores, e o delineamento foi em blocos ao acaso, com cinco repetições, com três hastes por unidade experimental. Independentemente do modo de aplicação do AVG, as concentrações utilizadas promoveram aumento da longevidade das flores em aproximadamente 70% em comparação ao controle, com resposta máxima nas concentrações de 1,5 e 2 mM. Apercentagem de abscisão de flores foi reduzida em todos os tratamentos com AVG, principalmente quando se utilizou pulverização, com decréscimo na abscisão acumulada superior a 80% nas concentrações entre 1 e 2 mM de AVG.A aplicação de AVG prolongaa longevidadee reduz a abscisãode flores de Epidendrum ibaguense.
Postharvest role of jasmonic acid and wounding on expression of defense related metabolism in sugar beet roots
(Universidade Federal de Viçosa, 2016-03-18) Oliveira, Lucilene Silva de; Finger, Fernando Luiz; http://lattes.cnpq.br/3160525387384694
Jasmonate (JA) can act as an inducer expression of defense genes against biotic and abiotic stress by process of priming plant. Exogenous application of JA has been shown to reduce rotted tissue and control postharvest pathogen in sugarbeet roots. However, the mechanism involved in the postharvest induction of defense by JA in sugarbeet roots is unknown. Consequently, we investigated the JA-induced mechanisms which protect roots from storage pathogens by identifying and characterizing genes that are altered by JA treatment. JA (10 μM) treatment to sugarbeet roots resulted alteration significant of unigenes expression. RNA-Seq data showed that 30 and 49 putative defense genes were upregulated at 2 and 60 days after JA-treatment, respectively. In sugarbeet roots, peroxidases, cinnamate-4-hydroxilase, chitinase acid, laccases, nbs-Irr resistant, pathogen-related thaumatin family protein, proteinase inhibitor and β- glucosidase were found at higher levels (fold change ranged from 1.8 to 8.3) in treated than control roots at 2 d subsequent to JA-application. At 60 days after JA treatment observed that peroxidase, chitinase, cinnamate-4 hydroxilase and cc-nbs-Irr resistant protein were also up-regulated. These upregulated unigenes are related with biosynthesis of secondary metabolites, cell wall reinforcement, as well as for plant- pathogen interaction. Thus, the present study suggests that JA treatment could prime sugarbeet inducting a series of defense genes, including defense-related proteins and key enzymes related secondary metabolites. JA also increased the ability of sugarbeet cells to recognize pathogen which may result faster activation of immune response and then reduction of infection and susceptibility. In addition to rotted losses in rot storage it is extremely importance to avoid losses during sugarbeet growth. Insect attack by sugarbeet root magoot is one of damage that significantly reduces root yield and sucrose content and can devastate individual fields. Thus, study of resistance mechanism is essential to provide new control strategies and reduce insecticides spray. We investigated if resistance of some genotypes is achieved through activation of chitinase, peroxidase and polyphenoloxidase. Root of nine genotypes sugarbeet, susceptible and resistant to maggot fly, were wounding 4 weeks after planting to mimic maggot attack. The results showed neither peroxidase nor polyphenol oxidase activity is correlated to maggot fly resistant in sugarbeet roots. We observed that chitinase activity was significantly reduced for some genotypes after wounding, although no significance difference was found between resistant and susceptible sugarbeet genotypes.
Short- and long-term changes in sugarbeet (Beta vulgaris L.) gene expression due to postharvest jasmonic acid treatment - Data
(ScienceDirect, 2017-02-02) Oliveira, Lucilene Silva de; Fugate, Karen Klotz; Ferrareze, Jocleita Perruzo; Bolton, Melvin D.; Deckard, Edward L.; Finger, Fernando L.
Jasmonic acid is a natural plant hormone that induces native defense responses in plants. Sugarbeet (Beta vulgaris L.) root unigenes that were differentially expressed 2 and 60 days after a postharvest jasmonic acid treatment are presented. Data include changes in unigene expression relative to water-treated controls, unigene annotations against nonredundant (Nr), Swiss-Prot, Clusters of Orthologous Groups (COG), and Kyoto Encyclopedia of Genes and Genomes (KEGG) protein databases, and unigene annotations with Gene Ontology (GO) terms. Putative defense unigenes are compiled and annotated against the sugarbeet genome. Differential gene expression data were generated by RNA sequencing. Interpretation of the data is available in the research article, “Jasmonic acid causes short- and long-term alterations to the transcriptome and the expression of defense genes in sugarbeet roots” (K.K. Fugate, L.S. Oliveira, J.P. Ferrareze, M.D. Bolton, E.L. Deckard, F.L. Finger, 2017) [1]. Public dissemination of this dataset will allow further analyses of the data.