Avaliação do potencial de agentes biológicos e seus produtos no controle da cancro cítrico causado por Xanthomonas axonopodis pv. citri

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Asiatic citrus canker caused by Xanthomonas axonopodis pv. citri (Xac) (Hasse) is a disease known worldwide in the majority of commercial citrus production areas Limited strategies exist for suppression of citrus canker on more susceptible cultivars. The application of microorganisms as agent to control citrus canker is a great ecological progress to solve these problems. The experiments were carried out in a greenhouse conditions and the antagonist bacteria (EC, FRC, LV and LN) and their product (bacterial suspensions, cell-free supernatants and ethyl-acetate fraction from LN strain) were tested on the control of Xac population, citrus canker incidence and severity in orange leaves (Citrus sinensis cv. Valencia). The bacterial products were sprayed or left in direct contact with orange leaves before (pre) or after (post) inoculation of Xac. The results showed a reduction of population of Xac when the bacterial suspension from strain EC was applied. In other experiment all strains reduced lesion number and lesion area when the leaves were treated with cell-free supernatant, also was observed the same effect when the leaves were treated with fraction of ethyl-acetate from LN strain. All inhibitory effect were observed when the leaves were treated with bacterial products after Xac inoculation. These results showed that antagonist bacteria and their products could be used in the control of citrus canker disease caused by Xac.

ASSUNTO(S)

cancro cítrico microbiologia agrícola agricultural microbiology citrus canker xanthemonas

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