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Plant Pathol J. 2017 Feb;33(1):21-33. doi: 10.5423/PPJ.OA.08.2016.0161. Epub 2017 Feb 1.

Characterization of Pseudomonas syringae pv. syringae, Causal Agent of Citrus Blast of Mandarin in Montenegro.

Author information

1
Institute for Plant Protection and Environment, Belgrade 11040, Serbia.
2
Biotechnical Faculty, University of Podgorica, Podgorica 81000, Montenegro.
3
Scholar of Ministry of Education, Science and Technological Development of the Republic of Serbia, Department of Plant Disease, Institute for Plant Protection and Environment, Belgrade 11040, Serbia.

Abstract

Citrus blast caused by bacterium Pseudomonas syringae is a very important disease of citrus occuring in many areas of the world, but with few data about genetic structure of the pathogen involved. Considering the above fact, this study reports genetic characterization of 43 P. syringae isolates obtained from plant tissue displaying citrus blast symptoms on mandarin (Citrus reticulata) in Montenegro, using multilocus sequence analysis of gyrB, rpoD, and gap1 gene sequences. Gene sequences from a collection of 54 reference pathotype strains of P. syringae from the Plant Associated and Environmental Microbes Database (PAMDB) was used to establish a genetic relationship with our isolates obtained from mandarin. Phylogenetic analyses of gyrB, rpoD, and gap1 gene sequences showed that P. syringae pv. syringae causes citrus blast in mandarin in Montenegro, and belongs to genomospecies 1. Genetic homogeneity of isolates suggested that the Montenegrian population might be clonal which indicates a possible common source of infection. These findings may assist in further epidemiological studies of this pathogen and for determining mandarin breeding strategies for P. syringae control.

KEYWORDS:

Citrus reticulata; bacteria; multilocus sequence analysis; pathogen; phylogeny

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