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Characteristics Of Fluorescent Pseudomonas Isolated From Citrus Phylospher
And Their Antagonistic Activity Against Xanthomonas Axonopodis Pv.
Citri
Gholam Khodakaramian
Department of Plant Pathology, College
of Agriculture, Tarbiat Modarres University, P.O. Box 14155-4838, Tehran, Iran.
E-mail: Khodakaramian@yahoo.com
Abstract
Citrus bacterial canker in southern Iran is a serious disease caused by
Xanthomonas axonopodis pv. citri and X. axonopodis. The pathogens can
which they could be differentiated by host range and AFLP fingerprinting. A
total of 80 strains of fluorescent pseudomonads were isolated from citrus
phylosphers and characterized by FAMEs analysis and phenotypic features
determination. Isolated fluorescent pseudomonads strains were identified as
Pseudomonas putida biovar B, P. fluorescens biovars 1, 3 and 5 and
P. viridiflava. By comparison of the protein electrophoretic patterns of
the isolated fluorescent pseudomonads isolates, twenty representatives were
selected. These representatives were examined for their antagonistic activity
towards X. axonopodis pv. citri in vitro by measuring their inhibition zone and
ability to produce antibiotic and siderophore. Some of the representative
isolates could produce antibiotic and siderophore and they inhibited the growth
of X. axonopodis pv. Citri in-vitro. Based on the results of in-vitro
experiments, five isolates were selected and one concentration was applied in a
complete randomized block design under greenhouse conditions. Results showed
that most of the applied isolates could reduced citrus canker disease incidence
caused X. axonopodis pv. Citri, and the reduction ranged from 10.39 to
54.93%.
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