About this Research Topic

Background

Many of the most prevalent and devastating human and animal pathogens have part of their life-cycle outwith the animal host. These pathogens have a remarkably wide capacity to adapt to a range of quite different environments: physical, chemical and biological, which is part of the key to their success. Many of the well-known pathogens that are able to jump between hosts in different biological kingdoms are transmitted through the fecal-oral and direct transmission pathways, and as such have become important food-borne pathogens. Some high-profile examples include fresh produce-associated outbreaks of Escherichia coli O157:H7 and Salmonella enterica. Other pathogens may be transmitted via direct contact or aerosols are include important zoonotic pathogens. It is possible to make a broad division between those pathogens that are passively transmitted via vectors and need the animal host for replication (e.g. virus and parasites), and those that are able to actively interact with alternative hosts, where they can proliferate (e.g. the enteric bacteria). This research topic will focus on plants as alternative hosts for human pathogens, and the role of plants in their transmission back to humans. The area is particularly exciting because it opens up new aspects to the biology of some microbes already considered to be very well characterized. One aspect of cross-kingdom host colonization is in the comparison between the hosts and how the microbes are able to use both common and specific adaptations for each situation.

The area is still in relative infancy and there are far more questions than answers at present. We aim to address questions underlying the interactions for both the microbe and plant host in the research topic by including the following areas:
• the ecology underlying persistence and growth of the pathogens in association with plants
• the epidemiology of the pathogens in plant hosts and associated risk analyses
• classical evolutionary aspects and population genetics, including emerging pathogens
• the molecular basis to pathogen adaptation to plant hosts
• the plant defense response, for which we know far more for the phytopathogens than animal pathogens
• differences between pre- and post-harvest colonization
• cycling between animal and plant hosts, such as transmission dynamics in the farm setting

While the majority of the research already published has focused on the enteric bacterial pathogens, there is no doubt that other human pathogens can also interact with plants as part of the life-cycle. Therefore, we would also welcome articles examining the interactions for some of the less well reported pathogens. We are interested in hearing from potential authors who can provide original research articles, reviews and opinion pieces.

Important note: All contributions to this Research Topic must be within the scope of the section and journal to which they are submitted, as defined in their mission statements. Frontiers reserves the right to guide an out-of-scope manuscript to a more suitable section or journal at any stage of peer review.

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