Effect of Plant Species and Environmental Conditions on Epiphytic Population Sizes ofPseudomonas syringaeand other Bacteria
- 1 January 1989
- journal article
- research article
- Published by Scientific Societies in Phytopathology®
- Vol. 79 (5) , 619-627
- https://doi.org/10.1094/phyto-79-619
Abstract
Selected biological and environmental effects influenced epiphytic colonization of plants by Pseudomonas syringae, Escherichia coli, Salmonella typhimurium, Aeromonas hydrophila, and Rhizobium meliloti when tested in a growth chamber at 24 C. Epiphytic population size varied with plant host, environmental conditions, and among strains of P. syringae tested. Strains of P. syringae achieved only slightly larger population sizes than strains from other genera when incubated on inoculated plants for 48 hr, and near 100% relative humidity (RH). However, the strains of P. syringae maintained populations at least 25 times higher after a subsequent 72 hr at 40% RH. Epiphytic population of 15 different strains of P. syringae varied up to 10-fold on a given plant species, indicating epiphytic diversity within this bacterial species. Relative population sizes of three strains of P. syringae on plants under field conditions were predicted by growth chamber populations. Neither epiphytic strains, pathogenic strains, or toxin producing groups were associated with greater epiphytic population sizes. Different plant species varied up to 17-fold in the sizes of bacterial populations supported. Maceration of inoculated plant tissue increased bacterial population size estimates relative to cells moved by sonication, but only after low RH incubations.This publication has 13 references indexed in Scilit:
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