Phylogenetic analyses based on 16S rRNA gene sequences placed Pcor within the P. Pcor is ubiquitous and has been isolated from the root environment in different countries (Kovacevich and Ryder, 1991 Ryder and Rovira, 1993 Schisler and Slininger, 1994 Achouak et al., 2000 Walker et al., 2000 Pandey et al., 2001). It has since been isolated from several other crop plants suffering pith necrosis, including pepper (Lopez et al., 1988), chrysanthemum (Fiori, 1992) and geranium (Magyarosy and Buchanan, 1995). Pcor was the first of the two species discovered as the causal agent of tomato pith necrosis (TPN) (Scarlett et al., 1978 Catara, 2007). This genus predominantly consists of fluorescent species, but also contains some non-fluorescent species, including, P. ( 2002) are two closely related Gammaproteobacteria species belonging to the genus Pseudomonas sensu stricto (De Vos et al., 1985 Kersters et al., 1996). Pseudomonas corrugata ( Pcor) Robert and Scarlet 1981 emend. Our study provides the basis for in-depth investigations regarding the molecular mechanisms underlying virulence strategies in the battle between plants and microbes. A highly conserved quorum sensing system was detected in all strains, although species specific differences were observed. ![]() Genome-mining also revealed the presence of gene clusters for biosynthesis of siderophores, polyketides, non-ribosomal peptides, and hydrogen cyanide. Several gene clusters coding for type VI secretion system were detected in all genomes. The lack of a type III secretion system appears to be unique among the plant pathogenic pseudomonads. Genome-mining revealed the absence of type III secretion system and known type III effector-encoding genes from all examined Pcor and Pmed strains. All examined strains were able to trigger symptoms in tomato plants but not all induced a hypersensitive-like response in Nicotiana benthamiana. This analysis covered significant genetic heterogeneity and allowed in-depth genomic comparison. Here, we present the draft genomes of nine Pcor and Pmed strains from different geographical locations. An extensive comparative genomics study is required to dissect the mechanisms that Pcor and Pmed employ to cause disease, prevent disease caused by other pathogens, and to mine their genomes for genes that encode proteins involved in commercially important chemical pathways. In addition, their metabolic versatility makes them attractive for the production of commercial biomolecules and bioremediation. However, they also show strong antagonistic effects against economically important pathogens, demonstrating their potential for utilization as biological control agents. mediterranea ( Pmed), are closely related species that cause pith necrosis, a disease of tomato that causes severe crop losses. ![]() The non-fluorescent pseudomonads, Pseudomonas corrugata ( Pcor) and P.
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