Erwinia chrysanthemi

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Description Erwinia chrysanthemi is known as"Dickeya chrysanthemi".these are Gram negative. Rods, occurring singly and in pairs. Motile by means of a varying number of peritrichous flagella.
Synonyms Dickeya chrysanthemi; Pectobacterium chrysanthemi; Pectobacterium parthenii var.dianthicola; Pectobacterium parthenii var.chrysanthemi; Pectobacterium parthenii; Pectobacterium chrysanthemi; Pectobacterium carotovorum var.chrysanthemi; Erwinia carotovora var. Chrysanthemi.
Habitat/Source Erwinia chrysanthemi was isolated from soft rot and wilt of Chrysanthemum spp.,Cynara scolymus, Cichorium intybus, Helianthus annuus, Lycopersicon esculentum, Parthenium argentatum .It was isolated from blight of chrysanthemum, sedum and celery.
Pathogenicity These organisms are plant-specific pathogens that invade the vascular systems of plants. Both Erwinia chrysanthemia and Erwinia caratavora cause soft-rot diseases of various plant hosts through degradation of the plant cell walls. Erwinia colonize the intercellular spaces of plant cells and deliver potent effector molecules (Avr - avirulence) through a type III secretion system (Hrp - hypersensitive response and pathogenicity). Avr proteins control host-bacterium interactions, including host range.Expression of the plant cell-wall-degrading enzymes is controlled through a quorum-sensing mechanism that quantifies the number of Erwinia bacteria through measurement of the concentration of small molecules (acyl homoserine lactones) produced by Erwinia. Secretion of the various exoenzymes is via a type II secretion system and degradation of the plant cell wall is through depolymerization of the pectin component
GenBank Accession View Genome [NZ_CM001904.1]
Size(Mb) 4.61724
GC% 54.24
Genes 4126
CDS 3959
Reference

(1) chrysanthemi and E. chrysanthemi are homotypic synonyms. Samson et al. (2005) propose the transfer of this species to the genus Dickeya.

(2) Bergey's Manual of Determinative Bacteriology (9th Edition,p.207,Table 5.2).Edited by John G. Holt,The Williams & Wilkins Co..