RESUMO
IMPORTANCE: Pathogenic Xanthomonas bacteria can affect a variety of economically relevant crops causing losses in productivity, limiting commercialization and requiring phytosanitary measures. These plant pathogens exhibit high level of host and tissue specificity through multiple molecular strategies including several secretion systems, effector proteins, and a broad repertoire of carbohydrate-active enzymes (CAZymes). Many of these CAZymes act on the plant cell wall and storage carbohydrates, such as cellulose and starch, releasing products used as nutrients and modulators of transcriptional responses to support host colonization by mechanisms yet poorly understood. Here, we reveal that structural and storage ß-glucans from the plant cell function as spatial markers, providing distinct chemical stimuli that modulate the transition between higher and lower motility states in Xanthomonas citri, a key virulence trait for many bacterial pathogens.
Assuntos
Glucanos , Xanthomonas , Glucanos/metabolismo , Proteínas , Bactérias/metabolismo , Plantas/microbiologia , Xanthomonas/genética , Xanthomonas/metabolismo , Doenças das Plantas/microbiologia , Proteínas de Bactérias/genética , Proteínas de Bactérias/metabolismoRESUMO
The phylogenetic position of Triatoma sherlocki within triatomines group was inferred by analyzing mtDNA fragments of Cyt B and 16S ribosomal RNA by using maximum parsimony and Bayesian analysis. Despite being differentiated from members of the T. brasiliensis complex on morphologic grounds, molecular phylogenetic analysis suggests T. sherlocki is a member of this complex; moreover, it was placed as a sister species of T. melanica. These suggestions were supported by robust credibility rates. Hence, we show evidence for the paraphyletic group of the "Triatoma brasiliensis complex," which should be composed of T. brasiliensis brasiliensis, T. brasiliensis macromelasoma, T. juazeirensis, T. melanica, and T. sherlocki.