Mestrado em Agronomia

URI Permanente para esta coleção

http://repositorio.ufes.br/handle/10/17350

Nível: Mestrado Acadêmico
Ano de início: 2004
Conceito atual na CAPES: 4
Ato normativo: Mestrado - Reconhecido Port. MEC 609, de 14/03/2019, DOU 18/03/2019, parecer 487/2018).
Periodicidade de seleção: Semestral
Área(s) de concentração: Produção Vegetal
Url do curso: https://producaovegetal.ufes.br/pt-br/pos-graduacao/PPGA/detalhes-do-curso?id=1427

Navegar

Agora exibindo 1 - 8 de 8

Crescimento, acumulo de nutrientes e reação de genótipos de Coffea canephora ao parasitismo depor Meloidogyne incognita e M. paranaensis
(Universidade Federal do Espírito Santo, 2025-07-10) Gomes, Sâmela Cansi; Bento, Cíntia dos Santos; https://orcid.org/; http://lattes.cnpq.br/; Amaral, José Francisco Teixeira do; https://orcid.org/; http://lattes.cnpq.br/; Alves, Fábio Ramos; https://orcid.org/; http://lattes.cnpq.br/; https://orcid.org/; http://lattes.cnpq.br/; Cavatte, Paulo Cezar; https://orcid.org/; http://lattes.cnpq.br/; Moraes, Simone de Paiva Caetano Bucker; https://orcid.org/; http://lattes.cnpq.br/; Silva, Lilianne Gomes da; m; m
The coffee plant, Coffea spp., is affected by several diseases that represent the main limiting factor to its production potential, with emphasis on diseases caused by soil-borne pathogens, especially phytonematodes of the genus Meloidogyne Göldi, 1887. Two experiments were carried out. The first, in a greenhouse from September 2024 to January 2025, evaluated the effect of M. incognita (Mi) parasitism on the morphological, nutritional, and genetic resistance characteristics of C. canephora (Cc) genotypes. The experiment was carried out for 90 days in CRD in a 7 x 2 factorial scheme (6 genotypes of C. canephora: A1, MC7, K61, AS2, R8 and R22 and LB1 clonal var. Jequitibá: susceptibility pattern to Meloidogyne spp.) x 2 nematode inoculum levels (0 and 5,000 individuals/plant) with 7 replicates for each inoculum level. The second experiment, carried out between January and May 2025, was identical to the first, except that the genotypes were inoculated with M. paranaensis (Mp). In both experiments, nematode reproduction, plant growth, nutrient concentration, and anthocyanin and flavonoid levels in leaves were evaluated, as well as total soluble phenol concentration in roots. Genotypes A1 and K61 inoculated with M. incognita had RF values less than 1 and were considered resistant. The other genotypes had RF values greater than 1 and were susceptible. Regarding the genotypes inoculated with M. paranaensis, except for LB1, the others had RF values less than 1 and were resistant. Whether comparing within the same period (0 or 90 days after inoculation, DAI) or between different evaluation periods, the means of the evaluated variables did not follow the same trend. That is, for some genotypes susceptible to M. incognita or M. paranaensis, there was a reduction in the evaluated variables, as expected. On the other hand, some resistant clones also showed a reduction in these variables. It was also noted that in some evaluations, susceptible genotypes showed an increase in the studied variables, and resistant genotypes showed a reduction
Eficácia de isolados bacterianos na mortalidade de Meloidogyne exigua
(Universidade Federal do Espírito Santo, 2023-02-24) Silva, Milena Barbosa Parreira da; Alves, Fábio Ramos; https://orcid.org/0000000182002891; http://lattes.cnpq.br/6721628649701157; https://orcid.org/0009000199152578; http://lattes.cnpq.br/2952230822110474; Moraes, Willian Bucker; https://orcid.org/0000000174787772; http://lattes.cnpq.br/6727861982577995; Chagas, Elcio do Nascimento; https://orcid.org/0000-0003-3333-857X; http://lattes.cnpq.br/5470740340228381; Silva, Fernanda Pereira da; https://orcid.org/0000-0003-1612-9565; http://lattes.cnpq.br/7651923743467176
One of the most used methods for managing M. exigua is through the application of chemical nematicides, however, these products are harmful to animals, humans and the environment, which is why alternative ways of managing this pathogen have been sought, such as the use ofantagonistic bacteria. Two experiments (experiments 1 and 2) were carried out and repeated once. In the first, the effect of bacterial isolates obtained from commercial biofertilizers on themortality of M. exigua 'in vitro' was studied. The experimental design was completely randomized (CRD) with 22 treatments (20 bacterial isolates + one positive control + one negative control) and four replications, totaling 88 experimental units. Seven out of twenty bacterial isolates (B74, B75, B84, B85, B86, B88, B121), demonstrated effect on the mortalityof M. exigua J2s after 24 hours of incubation. Bacteria B74, B75, B84, B86 and B88 were identified and belong to the genus Bacillus sp., whereas isolates B85 and B121 were identifiedas Micrococcus sp. and Brevibacterium epidermidis, respectively. Isolates B88, B74, B121, B86 showed mortality percentages greater than 75%, whereas B75, B84 and B85 reached percentages greater than 57%. In the second experiment, the selection and compatibility test was carried out between the most promising bacterial isolates antagonistic to M. exigua in experiment 1. The experimental design was CRD with 9 treatments (7 bacterial isolates + one positive control + one negative control) and four repetitions. There was no antagonistic effect among the studied bacterial isolates. The results of experiments 1 and 2 show the potential, mainly of isolates B121, B74, B86, B88, as possible biological control agents for M. exigua and indicate that these bacteria can be used in combination for the management of phytonematodes, as they do not have an antagonistic effect on each other.
Eficiência de nematicidas biológicos e químicos no manejo de Meloidogyne enterolobii em goiabeira
(Universidade Federal do Espírito Santo, 2016-02-12) Alves, Cíntia da Silva; Alves, Fábio Ramos; Moraes, Willian Bucker; Souza, Antonio Fernando de; Giannotti, Juliana Di Giorgio
Given that the decline of the guava tree is characterized as a complex disease caused by parasitism M. enterolobii, which predisposes the plant to root rot caused by the fungus Fusarium sp. Three experiments were carried out in vitro with the following ob
Ferrugem do cafeeiro conilon: fatores nutricionais relacionados à favorabilidade da intensidade da doença e desenvolvimento de uma nova escala diagramática
(Universidade Federal do Espírito Santo, 2018-02-20) Belan, Leonardo Leoni; Alves, Fábio Ramos; Costa, H.; Amaral, J. F. T.; Souza, A. F.; Tomaz, M. A.
Manejo de Meloidogyne javanica em cultivo de alface
(Universidade Federal do Espírito Santo, 2014-08-30) Rodrigues, Lilian Lagem; Chagas, Elcio do Nascimento; Alves, Fábio Ramos; Moraes, Willian Bucker; Zago, Hugo Bolsoni
The root-knot nematodes, Meloidogyne spp., are among the main phytosanitary problems of the lettuce crop. The management of these pathogens is often made with chemicals. However, due to the rapid crop of lettuce and long residual periods of these chemical
Prospecção, caracterização de novos bacteriófagos e desenvolvimento de formulação 3 para o controle de Ralstonia solanacearum em tomateiro
(Universidade Federal do Espírito Santo, 2025-03-25) Dian, Vanessa Sessa; Melo, Alessandra Gonçalves; https://orcid.org/; http://lattes.cnpq.br/; Vidigal, Pedro Marcus Pereira; https://orcid.org/; http://lattes.cnpq.br/; Xavier, André da Silva; https://orcid.org/; http://lattes.cnpq.br/; https://orcid.org/; http://lattes.cnpq.br/; Alves, Fábio Ramos; https://orcid.org/; http://lattes.cnpq.br/; Souza, Elineide Barbosa de; https://orcid.org/; http://lattes.cnpq.br/; Gama, Marco Aurélio Siqueira da; Maciel, Laiane Silva; Paiva, Carlos Eduardo Costa
Bacterial wilt, caused by the Ralstonia solanacearum Species Complex (RSSC), leads to significant yield losses in economically important crops. Currently, no effective control measures are available against these phytobacteria, highlighting the need to develop ecological and efficient strategies to protect agricultural crops. The use of bacteriophages (phages) as biocontrol agents is a safe, sustainable, and promising strategy. This research aimed to discuss recent advances in the application of phages in the protection of agricultural crops, as well as to isolate and characterize new phages capable of infecting RSSC. In addition, this study evaluated the synergy and stability of these phages at different pH levels, propose cocktail formulations for the biocontrol of bacterial wilt in tomato plants, and investigate the pathogen's responses to the phages. For this, the phages were characterized through biological and molecular analyses, and two of them were selected based on lytic activity, ability to survive in a wide pH range, and virulence against the bacteriophage insensitive mutants (BIMs). Cocktails were formulated to suppress bacterial wilt in tomato plants, and their yields and viability during storage were analyzed. A total of eight new phages were isolated and biologically characterized. Seven of these phages had their genomes sequenced and annotated. Their comparative genome analysis showed that these seven new phages are biologically contrasting isolates of the same species, with a new genus, named 'Kapixawavirus' being suggested. These phages are more virulent against the R. solanacearum strains isolated in Brazil. Two of these viral isolates, Kapixawa and Elisiario, survived at pH 4 to 11 for 10 days and reduced the frequency of BIMs. The viral cocktail, consisting of a mixture of phages Kapixawa and Elisiario and an avirulent isolate of R. solanacearum, protected 40% of tomato plants against bacterial wilt. The newly described group of phages can be used in low-cost approaches to produce cocktails and opens new avenues for the ecological management of bacterial wilt
Silício e aminoácidos no crescimento de mudas de cafeeiro arábica e na redução populacional de Meloidogyne exigua
(Universidade Federal do Espírito Santo, 2024-03-19) Fornaciari, Gabriel; Souza, Antonio Fernando de ; https://orcid.org/0000-0003-3261-9492; http://lattes.cnpq.br/; Amaral, José Francisco Teixeira do ; https://orcid.org/0000-0003-3027-4830; http://lattes.cnpq.br/; Tomaz, Marcelo Antonio; https://orcid.org/0000-0002-5307-0219; http://lattes.cnpq.br/; https://orcid.org/0000-0001-9630-0267; http://lattes.cnpq.br/; Souza, Gustavo Soares de ; https://orcid.org/0000-0002-8207-0218; http://lattes.cnpq.br/; Alves, Fábio Ramos ; https://orcid.org/0000-0001-8200-2891; http://lattes.cnpq.br/
Studies show that the supply of silicon and amino acids increases the resistance of plants to attack by phytopathogens, water deficit, salinity, in addition to improving nutritional status and some vegetative and physiological aspects due to greater photosynthetic efficiency. In this sense, the objective was to evaluate the effect of jointly supplying silicon and amino acids on the vegetative growth of arabica coffee seedlings and on the population reduction of Meloidogyne exigua. For this, an experiment was carried out testing five doses of a mixture of silicon (sodium silicate) and amino acids (0,0; 0,288; 0,575; 0,863 and 1,150 g plant-1). The experiment was conducted in a completely randomized design, where each experimental unit consisted of a 5 liter pot filled with soil and cultivated with an arabica coffee seedling of the Catuai Amarelo IAC 62 variety. The plants were inoculated with 6000 nematodes (eggs and juveniles of second stage) and were carried out for 120 days, when assessments were carried out related to vegetative development, leaf pigments, nutrient content in tissues and the population of nematodes present in the root system. The collected data was subjected to analysis of variance and subsequently the doses of silicon and amino acids were tested using regression models. The vegetative development of plants, leaf chlorophyll content and nitrogen and potassium content were negatively affected by the sodium ionic toxicity present in the silicate source. On the other hand, the final population of M. exigua in the coffee root system was significantly reduced. The number of galls had a total reduction of 52.7%, while the final population showed a reduction of 55.6%, at the maximum dose, when compared to the control
Toxicidade de manipueira sobre Meloidogyne spp.
(Universidade Federal do Espírito Santo, 2015-02-23) Camara, Guilherme de Resende; Moraes, Willian Bucker; Alves, Fábio Ramos; Chagas, Elcio do Nascimento; Zago, Hugo Bolsoni
The cassava is a liquid extracted from the cassava (Manihot esculenta L.) during the manufacturing process of the flour and contains a toxic glycoside called linamarin, which originates hydrocyanic acid (HCN), substances responsible for toxic effects on p

Navegar

Navegando Mestrado em Agronomia por Autor "Alves, Fábio Ramos"

Resultados por página

Opções de Ordenação