The Effects on Temperature on Growthin vitroofPseudomonas syringaeandXanthomonas pruni

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Abstract
Growth ratesin vitroofPseudomonas syringaeandXanthomonas pruniwere measured over the temperature range 0–36 °C. The estimated temperature optimum forX. pruniwas 31 °C, with a doubling time of 1.53 h. The estimated temperature optimum forP. syringaewas 28 °C with a doubling time of 1.27 h, although analysis showed no significant difference in the doubling times over the range 23–33 °C, indicating an unusual plateau at the maximum rate of growth of this organism.P. syringaeand related plant pathogenicPseudomonasspp. grew well at low temperatures, butX. prunidid not. Cultures ofP. syringaeandX. prunihad a very short lag phase after their incubation temperature was changed from 4 °C to a temperature close to their optimum (29 °C). When the incubation temperature of these organisms was changed from 11.5–29 °C,X. prunigrew without a lag phase at the rate expected for the higher temperature. However, the initial growth rate ofP. syringaeat the higher temperature was significantly greater than that at which the organism subsequently developed. The ecological significance of these points is discussed. The usefulness of the Arrhenius coefficients as characteristics of these organisms is discussed.

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