%0 Journal Article
%A Ercolani, G. L.
%T Two Hypotheses on the Aetiology of Response of Plants to Phytopathogenic Bacteria
%D 1973
%J Microbiology,
%V 75
%N 1
%P 83-95
%@ 1465-2080
%R https://doi.org/10.1099/00221287-75-1-83
%I Microbiology Society,
%X SUMMARY: Graded doses of six phytopathogenic bacteria, namely Pseudomonas lachrymans, P. morsprunorum, P. phaseolicola, P. syringae, P. tabaci and P. tomato, were introduced into the leaves of one of their natural (homologous) hosts and of other (heterologous) plants. Probit slopes for the infectivity of any of the six bacteria did not exceed the value b=2 in the homologous combinations, but were much greater than 2 in the heterologous ones. In the homologous combinations, the mean probability, P, per inoculated bacterium of multiplying to induce host response was invariant to inoculum dose, d. Hence the probability, Q, that a host would not respond after inoculation with d bacteria was given by the simple exponential, Q=e-pd . In the heterologous combinations, the value of P increased with increasing d.
%U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-75-1-83