Antibacterial activity of essential oils on Xanthomonas vesicatoria and control of bacterial spot in tomato

Pesquisa Agropecuária Brasileira

Gilvaine Ciavareli Lucas²  Eduardo Alves²  Ricardo Borges Pereira¹  Fabiano José Perina²  Ricardo Magela De Souza² 

[1],Universidade Federal de Lavras Departamento de Fitopatologia Lavras MG ,Brazil

关键词: alternative control of plant disease;    cell ultrastructure;    pathogenic bacteria;    controle alternativo de doenças de plantas;    ultraestrutura celular;    bactéria fitopatogênica;   

DOI  :  10.1590/S0100-204X2012000300006

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the effects of plant essential oils (EOs) on the growth of Xanthomonas vesicatoria, on bacterial morphology and ultrastructure, and on the severity of tomato bacterial spot. EOs from citronella, clove, cinnamon, lemongrass, eucalyptus, thyme, and tea tree were evaluated in vitro at concentrations of 0.1, 1.0, 10, and 100% in 1.0% powdered milk. The effect of EOs, at 0.1%, on the severity of tomato bacterial spot was evaluated in tomato seedlings under greenhouse conditions. The effects of citronella, lemongrass, clove, and tea tree EOs, at 0.1%, on X. vesicatoria cells were evaluated by transmission electron microscopy. All EOs showed direct toxic effect on the bacteria at a 10%-concentration in vitro. Under greenhouse conditions, the EOs of clove, citronella, tea tree, and lemongrass reduced disease severity. EOs of clove and tea tree, and streptomycin sulfate promoted loss of electron-dense material and alterations in the cytoplasm, whereas EO of tea tree promoted cytoplasm vacuolation, and those of citronella, lemongrass, clove, and tea tree caused damage to the bacterial cell wall. The EOs at a concentration of 0.1% reduce the severity of the disease.

【 授权许可】

CC BY   
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