Motility ofErwinia amylovora

Abstract
Flagella synthesis by E. amylovora is temperature-dependent with an optimum at 18-25.degree. C. For motility, a chelating agent and a pH of 6-9 are required. An external energy source is not required for motility although mannitol and glucose are stimulatory. Energy for motility can be derived from oxygen-dependent metabolism of endogenous energy sources. Motility under anaerobic conditions is possible if an energy source that can be metabolized in the absence of oxygen is available. E. amylovora cells inside [plant] host tissues are not motile but become motile when placed in contact with free water at temperatures optimal for flagella synthesis.