Abstract
Lipase is the major lipolytic enzyme within the quiescent conidium of Bremia lactucae. It is largly restricted to the nuclear envelope and endomembrane system. As the spore germinates and the lipid reserves become mobilized there is a shift towards a dependence on esterase for lipolysis. The cytoplasmic vesicles which discharge through the plasmalemma of the appressorium during penetration of the host epidermis appear devoid of lipolytic activity, but products of lipolysis occur in both fungal and host cell walls adjacent to that part of the cuticle which is being digested. In the presence of taurocholate or quinine hydrochloride distinct cytochemical patterns can be visualized in the appressorium during penetration. There may result from the exchange of substances which occurs following contact of the pathogen with its host.
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