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The role of nutrition in the host-parasite relationship has been related to the nutritional requirements of the parasite as they may or may not be satisfied by the host at the site either of inoculation or of localization. According to the nutrition-inhibition hypothesis of pathogenicity (Garber, 1956), the unavailability of one or more nutrilites in the host environment required by the parasite for proliferation or metabolism results in avirulence. Availability of all required nutrilites in the host environment, however, does not necessarily lead to virulence since the host may also present effective inhibitory mechanisms. Unavailability of nutrilites may result from a low concentration of these nutrilites in a utilizable form or the presence of antagonists or inhibitors which interfere with the uptake or utilization of nutrilites. Considerable evidence has been marshalled to support the role of nutrition in the host-parasite relationship (Garber, 1956). No data, however, have appeared in the literature available to us to demonstrate that a resistant host, in this context, differs from a susceptible host in the concentration of specific nutrilites required by the pathogen. It is the purpose of this report to present evidence indicating that individual plants from 3 varieties of turnip differ in their resistance or susceptibility to 3 histidine requiring mutants of Erwinia aroideae and to correlate these responses with differences in the concentrations of free histidine in the hosts.

FREE HISTIDINE CONTENT OF TURNIP VARIETIES AND THEIR RESISTANCE TO HISTIDINE REQUIRING MUTANTS OF ERWINIA AROIDEAE