INVESTIGADORES
CASTAGNARO atilio pedro
artículos
Título:
Bacteria causing important diseases of citrus utilise distinct modes of pathogenesis to attack a common host
Autor/es:
VOJNOV AA, ; DO AMARAL AM, ; DOW JM, ; CASTAGNARO AP,; MARANO MR
Revista:
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
Editorial:
SPRINGER
Referencias:
Lugar: Berlin; Año: 2010 vol. 87 p. 467 - 477
ISSN:
0175-7598
Resumen:
In this review, we summarise the currentknowledge on three pathogens that exhibit distinct tissuespecificity and modes of pathogenesis in citrus plants.Xanthomonas axonopodis pv. citri causes canker diseaseand invades the host leaf mesophyll tissue through naturalopenings and can also survive as an epiphyte. Xylellafastidiosa and Candidatus Liberibacter are vectored byinsects and proliferate in the vascular system of the host,either in the phloem (Candidatus Liberibacter) or xylem(X. fastidiosa) causing variegated chlorosis and huanglongbingdiseases, respectively. Candidatus Liberibactercan be found within host cells and is thus unique asan intracellular phytopathogenic bacterium. Genomesequence comparisons have identified groups of speciesspecificgenes that may be associated with the particularlifestyle, mode of transmission or symptoms produced byeach phytopathogen. In addition, components that areconserved amongst bacteria may have diverse regulatoryactions underpinning the different bacterial lifestyles; oneexample is the divergent role of the Rpf/DSF cell?cellsignalling system in X. citri and X. fastidiosa. Biofilmplays a key role in epiphytic fitness and canker developmentin X. citri and in the symptoms produced byX. fastidiosa. Bacterial aggregation may be associatedwith vascular occlusion of the xylem vessels and symptomatologyof variegated chlorosis.