Few microorganisms match the impact that the oomycetes have had on mankind. This distinct lineage of eukaryotes is wellknown for its most notorious member, Phytophthora infestans, the agent of the nineteenth century Irish potato famine, and several other devastating pathogens of cultivated and wild plants [1]. Indeed, more than 60% of oomycete species infect plants [2]. Less known is the fact t...

The primary objective of this thesis was to investigate the sterol metabolism of two pathogenic oomycetes, specifically the processes of sterol synthesis and sterol acquisition in the fish pathogen Saprolegnia parasitica (Saprolegniales) and the plant pathogen Phytophthora infestans (Peronosporales). Furthermore, the effects of steroidal glycoalkaloids from Solanaceous plants, on P. infestans, ...

Phytophthora-infected plants. These results suggest some diversity in the chitinase activities concerning New chitosanase acidic isoforms have been shown in substrate specificity in mycorrhizal plants. The Glomus mosseae-colonized tomato roots and their possible implications of these observations in the induction, together with the previously described functioning of the symbiosis is discussed....