in, plants and humans, has revealed a remarkable amount of conservation in the mechanisms available to them for survival and sometimes pathogenicity [103,117-119]. Table 2.2 lists some of the species of enteric bacteria that are potential foodborne pathogens, and the corresponding proteins that are putative factors for attachment to their animal hosts. Clearly, multiple types of fimbriae (G, types 1 and 3, IVB (curli, bundle forming)), pili (type 1, P, S), and flagella represent the major known attachment factors in enteric bacteria. In addition, all of the Gram-negative enteric bacteria shown in Table 2.2 express LPS, and some express CPS; both are major surface glycoconjugates that could serve as receptors for plant lectins, similar to the mechanisms described previously for plant nitrogen-fixing, epiphytic, and pathogenic bacteria (Table 2.1). Klebsiella spp., Enterobacter spp., and Pseudomonas spp. bridge the environments of plants and animals by their capability to colonize both hosts, presumably with Type 1 and 3 fimbriae, pili, and lectins involved in attachment (Table 2.2) [111,112,120]. Although certain species of these three bacterial genera have been recognized to have biologically relevant interactions with plants (e.g., nitrogen fixation, pathogenesis, competition), there is no evidence that the major foodborne enteric human pathogens (Table 2.3), many of which have been associated with produce outbreaks, are either pathogenic or beneficial for the plant. However, the apparent interactions of human pathogens with plant tissues, and their ability to survive and grow on plants under certain conditions (e.g., temperature, Table 2.3),
Was this article helpful?