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| Maciel,Karen Wolf; Destefano,Suzete Aparecida Lanza; Beriam,Luis Otavio Saggion; Almeida,Irene Maria Gatti de; Patricio,Flavia Rodrigues Alves; Rodrigues,Lucas Mateus Rivero; Guerreiro Filho,Oliveiro. |
| ABSTRACT Bacterial halo blight, caused by Pseudomonas syringae pv. garcae, is an important disease of coffee crop occurring in Brazil and other countries. In recent years, outbreaks of this disease have damaged several coffee crops in Brazil. Aggressiveness and genetic diversity of 25 strains of P. s. pv. garcae, obtained between the years 1958 and 2011, in 23 cities of São Paulo and Minas Gerais states, as well as three strains from Kenya were evaluated in this study. The strains were inoculated on coffee seedlings cultivar Mundo Novo, and their genetic diversity was evaluated by ERIC-PCR, REP-PCR, and their combination. All the strains were pathogenic to the coffee seedlings; the results of pathogenicity tests, in both experiments, could be divided in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pseudomonas syringae pv. garcae; Coffea arabica; ERICPCR; REP-PCR. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000100096 |
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| Rodrigues,Lucas Mateus Rivero; Sera,Gustavo Hiroshi; Guerreiro Filho,Oliveiro; Beriam,Luis Otavio Saggion; Almeida,Irene Maria Gatti de. |
| ABSTRACT The bacterial-halo-blight (Pseudomonas syringae pv. garcae) is disseminated by the main coffee areas in the producing states of Brazil. On the other hand, the disease bacterial-leaf-spot (Pseudomonas syringae pv. tabaci) was reported only once in coffee seedlings in a sample collected in the State of São Paulo. In mid-2015, samples of coffee leaves with symptoms of foliar lesions surrounded by yellow halo, were collected in coffee plantations in the State of Paraná and fluorescent bacteria producing or not brown pigment in culture medium were isolated and determined as belonging to the Group I of P. syringae. Through biochemical, serological and pathogenicity tests, the pathogens were identified as P. syringae pv. garcae and P. syringae pv.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica L.; Bacterial-halo-blight; Bacterial-leaf-spot. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400543 |
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| Rodrigues,Lucas Mateus Rivero; Braghini,Masako Toma; Guerreiro Filho,Oliveiro. |
| ABSTRACT Coffee resistance to Pseudomonas syringae pv. garcae has been associated to pleiotropic effect of SH1 allele, present in coffee plants resistant to certain races of Hemileia vastatrix, the causal agent of leaf rust, or genetic linkage between resistance alleles to both pathogens. To validate this hypothesis, 63 coffee plants in F2 generation were evaluated for resistance to 2 isolates of H. vastatrix carriers of alleles, respectively, v2, v5 (isolate I/2015) and v1; v2; v5 (isolate II/2015) with the objective to confirm presence of SH1 allele in resistant plants to isolate I/2015. The same coffee plants were evaluated for resistance to a mixture of P. syringae pv. garcae strains highly pathogenic to coffee. Results showed that, among F2 coffee... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica L.; Resistant cultivars; Pseudomonas syringae pv. garcae; Linkage; Hemileia vastatrix; Pleiotropic effect. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000200209 |
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