Some endophytes can synthesize molecules that elicit the induction of plant resistance to infection by pathogens. The objective this study was demonstrate protein fractions 42 and 75 from Bacillus amyloliquefaciens pumilus were capable acting as elicitors induced in tomato plants against Xanthomonas vesicatoria, following partial resolution gel-filtration chromatography. Tomato sprayed with reduced, respectively, 63.5 56.6% bacterial spot, compared control plants. Additionally, these...

O emprego de microrganismos para fins controle biologico fitomolestias vem sendo amplamente estudado no mundo. Neste contexto, o uso procariotos como bons agentes antagonicos contra fitopatogenos tem se mostrado uma alternativa crescente e inteligente manejo integrado doencas. Adicionalmente, muitos estudos vem sendo realizados com Bacillus subtilis, bacteria habitante natural do solo. A pode colonizar todos os orgaos vegetativos da planta, encontrada epifitica, endofitica rizobacteria,...

The objective of this work was to evaluate in vitro and vivo biocontrol bacterial spot (Xanthomonas vesicatoria) early blight (Alternaria solani) by the epiphytic bacteria Paenibacillus macerans Bacillus pumilus. Tomato plants were previously sprayed with bacteria, benzalkonium chloride PBS buffer and, after four days, they inoculated A. solani X. vesicatoria. To determine phytopathogenic population, leaflet samples collected from each treatment every 24 hours, for seven plated on...

Isolate UFV-101 of Bacillus cereus was selected in previous studies for promoting growth inducing resistance plants. In a study, supernatant from cultures the microorganism liquid medium found to induce tomato foliage against pathogens Pseudomonas syringae pv. tomato, Xanthomonas vesicatoria, Alternaria solani and Corynespora cassiicola. present work grown minimal 48 h cells precipitated centrifugation. The concentrated by lyophilization, dialyzed 12 kDa cut-off point membrane fractioned...

Dois antagonistas selecionados para o biocontrole da vassoura-de-bruxa do cacaueiro foram avaliados quanto à capacidade em ativar mecanismos de defesa plantas contra patógenos. Para tanto, mudas seminais "comum" cultivadas casa-de-vegetação por 30 dias e expostas aos aplicados a atomização, individualmente associação. O primeiro par folhas das dos diferentes tratamentos foi coletado dois, quatro, 12 24 após exposição antagonistas. Foi quantificada atividade peroxidases, polifenoloxidases,...

Endophytic bacteria Bacillus safensis RS95 and Pseudomonas hibiscicola RS121 were evaluated for their ability to promote the growth of rice seedlings produce indole-acetic acid (IAA) siderophores solubilize phosphates. 'Guri' seeds immersed in bacterial endophyte cell suspensions (separated two-strain mixed), as well Escherichia coli DH5α, phosphate-buffered saline (PBS) water treatments (negative controls). Seeds sown on agar-water Petri plates placed vertically at an angle 65°. The plant...

<title>Abstract</title> <italic>Erwinia psidii</italic> is an airborne and waterborne bacterium that causes eucalyptus bacterial blight, a destructive disease occurring in forests Brazil. To design assertive efficient control strategies to reduce or eliminate the incidence of disease, it necessary understand ability plant-pathogenic survive phylloplane conditions. We investigated survival <italic>E. on <italic>Eucalyptus urophylla</italic> (SUZBA1175), (SUZBA1922), grandis</italic> ×...

Abstract In Brazil, Paspalum species are commonly used in sports lawns, landscape projects, and as forage for livestock. guenoarum plants showing symptoms of take‐all disease were observed the state Rio Grande do Sul, Brazil. The fungus Gaeumannomyces graminis is only reported associated with this on . recent years, new have been proposed based molecular studies, which demonstrated existence a complex. Take‐all affects rice wheat, but aetiology P still unknown; work aimed to elucidate Brazil...

ABSTRACT This study aimed to develop and validate a standard area diagram (SAD) set estimate the severity of bacterial blight eucalyptus caused by Erwinia psidii. For this purpose, an eight-level SAD was developed validated ten inexperienced raters. Accuracy precision estimates each rater, with without SAD, were determined based on Lin’s concordance correlation coefficient. The proposed improved accuracy estimates. studied here is useful tool in assessments for epidemiological research...

Eucalyptus species are the most widely cultivated forestry in Brazil, currently covering over 5 million hectares. Recently, a new form of severe leaf blight was observed on all plants (about 2,880) hybrid clones (E. grandis x E. urophylla and globulus), benthamii dunnii grown glasshouse located at Campus Universidade Federal de Viçosa (Viçosa, state Minas Gerais, Brazil). So far, disease has not been field. Lesions started leaves as small, circular to elliptical, light brown spots surrounded...

Powdery mildew is one of the main diseases in eucalyptus clonal nursery. The present work aimed to confirm identity causal agent powdery seedlings Eucalyptus spp., and evaluate susceptibility reaction clones this disease. Conidia were collected minigardens for molecular identification pathogen. We assessed by testing 4 clones: Clone 1 (Eucalyptus benthamii ), 2 (E. dunni), 3 benthamii) urophylla x E. globulus). Scale classes was used calculations Disease Index (DI) Final Incidence (I)....

Abstract Erwinia psidii is an airborne bacterium that the causal agent of eucalyptus bacterial blight in Brazil. However, there are no studies on survival pathogen under epiphytic, soil and leaf debris conditions. We investigated E . phylloplane from two genotypes, within forest soil. A rifampicin‐resistant mutant (CR01R) was obtained wild type by gradient plate method chosen for study because it showed same morphological, growth, pathogenic aggressive properties as parental strain. On...