Efeito "in vitro" de antibióticos e rizobactérias no controle de bactérias fitopatogênicas ao Eucalyptus spp.

Cunha, Jeane de Fátima; Picoli, Edgard Augusto de Toledo; Alfenas, Acelino C.; Gonçalves, Rivadalve C.

doi:10.1590/s0100-67622006000600001

Cited by 6 publications

(4 citation statements)

References 4 publications

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“…Mechanisms involved in rhizobacterial induced growth promotion are not totally elucidated but are known to include the ability to produce or alter the concentration of plant hormones such as indole-3-acetic acid (IAA), gibberellic acid, cytokynins and ethylene; to asymbiotically fix nitrogen; and to act as antagonists against microbial plant pathogens either through production of siderophores, β-1,3-glucanase, chitanase, antibiotics and cyanide or through solubilization of mineral phosphate and other nutrients (CATTELAN et al, 1999;CUNHA et al, 2006).…”

Section: 2009mentioning

confidence: 99%

Root colonization and interaction among growth promoting rhizobacteria isolates and eucalypts species

Máfia¹,

Alfenas

Ferreira

et al. 2009

Rev. Árvore

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This work aimed to evaluate root colonization and interaction among isolates of rhizobacteria and eucalypt species. The method used to evaluate "in vitro" root colonization was able to indicate if the effect was benefic or deleterious allowing to pre-select isolates as potential growth promoter. There was interaction among isolates of rhizobacteria and Eucalyptus species for seed germinating and seedling growth. MF2 (Pseudomonas sp.) was the best rhizobacteria isolate for growth promotion of E. cloeziana e E. grandis. S1 (Bacillus subtilis) was the most effective for E. globulus, and Ca (Pseudomonas fulva), MF2 (Pseudomonas sp.), CIIb (Stenotrophomonas maltophilia) and S2 (B. subtilis) were the most promising isolates for the E. urophylla.RESUMO -O presente trabalho teve como objetivos avaliar a colonização de raízes e a interação entre isolados de rizobactérias e espécies de eucalipto. O método de avaliação da colonização de raízes "in vitro" possibilitou determinar o efeito benéfico ou deletério, permitindo uma pré-seleção de isolados potencialmente promotores de crescimento. Constatou-se interação entre isolados de rizobactérias e espécies de Eucalyptus em relação à germinação de sementes e o crescimento de mudas. MF2 (Pseudomonas sp.) foi o melhor isolado de rizobactéria para promoção de crescimento de E. cloeziana e E. grandis. Para E. globulus, destacou-se o S1 (Bacillus subtilis). Para E. urophylla, os isolados mais promissores foram Ca (Pseudomonas fulva), MF2 (Pseudomonas sp.), CIIb (Stenotrophomonas maltophilia) e S2 (B. subtilis).

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Section: 2009mentioning

confidence: 99%

Root colonization and interaction among growth promoting rhizobacteria isolates and eucalypts species

Máfia¹,

Alfenas

Ferreira

et al. 2009

Rev. Árvore

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“…The quality of some antifungal compounds such as 2-ethylhexanol, 2,4-bis (2-methylpropyl) phenol, 4-hydroxybenzaldehyde and 2-nonanone was also demonstrated in other pathosystems (Wang et al, 2004, Almenar et al, 2007. Non-volatile metabolites from B. subtilis, besides possessing antifungal metabolites are also effective in controlling some phytobacterias (Cunha et al, 2006).…”

Section: Introductionmentioning

confidence: 97%

Antagonism of Bacillus subtilis Against Sclerotinia sclerotiorum on Lactuca sativa

Monteiro¹,

Ferreira²,

Pacheco³

et al. 2013

JAS

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The objectives of this study were select and test the efficiency of the Bacillus subtilis strain and its metabolites against Sclerotinia sclerotiorum in all stages of its cycle. The bacterium was selected by performing antibiosis test against this and other pathogens, being selected that one who obtained the best result. For the assessment of radial mycelial growth under the influence of metabolite, this was added to PDA culture medium and the fungus was placed on its surface, being evaluated daily in the both directions. The test with volatiles was performed by using the two surfaces of the Petri dish, each containing culture medium, putting the fungus and the bacteria separately one on each surface without any contact between them, being measured every day the mycelial growth dimensions. For the evaluating the direct effect on the sclerotia was applied 1 mL of bacterial suspension (1.002 absorbance value at wavelength of 550 nm) to observe the possible presence of harmful substances to this structure. The test for the possible protection provided by the strain on lettuce (Lactuca sativa) was performed with four varieties grown up to 60 days after sowing, when was sprayed the bacterial suspension following the best incubation time tested. The antibiosis test showed a decreased by 16.33% compared to control. The metabolite, when mixed into the culture medium showed better inhibition results of the radial mycelial growth when concentration and incubation time were greater. The volatile test showed a reduction of 83.33% on mycelial growth. For the test with sclerotia, the mycelial and carpogenic germination were higher than the control. In vivo treatments with lettuces were observed differentiated levels of control, and some plants showed extremely sensitive to bacterial cells concentration used. This study show the B. subtilis as a biocontrol agent applying different strategies to control the pathogen and also the hipensensitive plant reaction in some cases.

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“…supressão do crescimento de espécies de fitobactérias dos gêneros Xanthomonas, Erwinia e Clavibacter.A baixa eficiência dos antibióticos para controle da mancha branca do milho, observada no presente trabalho, está de acordo com os resultados encontrados em outros trabalhos, como o de Bomfeti et alPinto et al (2004), em que a pulverização de sulfato de estreptomicina + oxitetraciclina não apresentou eficiência no controle da doença em condição de campo. Outros autores também observaram uma baixa eficiência de antibióticos no controle de fitobactérias(Cunha et al, 2006). Segundo Romeiro(2005), os antibióticos, embora apresentem elevada eficiência no controle de fitobactérias in vitro, não são recomendados para aplicação em condição de campo, pois são facilmente lavados por chuva, não são absorvíveis e nem translocáveis na planta e causam desequilíbrio nos ecossistemas.…”

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Eficiência de Fungicidas para o Controle da Mancha Branca do Milho

Costa

Lanza

Figueiredo³

2012

Revista Brasileira de Milho e Sorgo

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RESUMO -A mancha branca é uma das principais doenças da cultura do milho no Brasil na atualidade. Dentre as medidas recomendadas para o controle da mancha branca, a resistência genética e o uso de fungicidas são as mais utilizadas pelos produtores. No entanto, relatos de baixa eficiência de controle com diferentes grupos químicos têm sido frequentes, o que tem gerado dúvidas quanto à sua eficiência no controle dessa doença em condição de campo. No presente trabalho, foram conduzidos quatro ensaios, em condição de campo, utilizando-se cultivares com diferentes níveis de resistência ou suscetibilidade à mancha branca do milho. Foi avaliada a eficiência de diferentes grupos químicos de fungicidas no manejo da mancha branca do milho em diferentes números de aplicações. Com os resultados obtidos, verificou-se que os fungicidas do grupo das estrobilurinas foram os que apresentaram maior eficiência no controle da doença. Os fungicidas triazóis, carbendazim, o tiofanato metílico e os antiobióticos oxitetraciclina e kasugamicina apresentaram baixa eficiência de controle. Palavras-chave: Doença, manejo, controle químico. EFFICIENCY OF FUNGICIDES TO CONTROL MAIZE WHITE SPOTABSTRACT -The white spot is a major disease of corn nowadays. Genetic resistance and fungicide application are considered the most important procedures to control this disease and the most used by producers.. However, reports of low efficiency of control with different chemical fungicides have been frequent, which has generated doubts about its effectiveness in controlling the disease in the field. In the present study, four experiments were conducted in field conditions, using cultivars with different levels of resistance or susceptibility to maize white spot. The efficiency of different chemical groups of fungicides in the management of maize white spot was evaluated using different number of applications. The results demonstrated that the strobilurin fungicide group presented the greatest efficiency in controlling the disease. The fungicides triazole, carbendazim and thiophanate and the antibiotics oxytetracycline and kasugamycin showed low control efficiency.

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Efeito "in vitro" de antibióticos e rizobactérias no controle de bactérias fitopatogênicas ao Eucalyptus spp.

Cited by 6 publications

References 4 publications

Root colonization and interaction among growth promoting rhizobacteria isolates and eucalypts species

Root colonization and interaction among growth promoting rhizobacteria isolates and eucalypts species

Antagonism of Bacillus subtilis Against Sclerotinia sclerotiorum on Lactuca sativa

Eficiência de Fungicidas para o Controle da Mancha Branca do Milho

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