34 35 The role of pathogens, including oomycetes, in long-term ecosystem development has 36 remained largely unknown, despite hypotheses that pathogens drive primary succession, 37 determine mature ecosystem plant diversity, or dominate in retrogressive, nutrient-limited 38 ecosystems. Using DNA sequencing from roots, we investigated the frequency and host 39 relationships of oomycete communiti...

The cytochrome systems of two classes of aquatic fungi, the Oomycetes and Chytridiomycetes, were studied by means of reduced-minus-oxidized difference spectra at room and at low temperature. At room temperature, all of these fungi have a c-type cytochrome with an absorption maximum at 551 mmu and a b-type cytochrome at 564 mmu. The Oomycetes have a-type cytochromes at 605 mmu, and the Chytridio...

Filamentous fungi and oomycetes are eukaryotic microorganisms that grow by producing networks of thread-like hyphae, which secrete enzymes to break down complex nutrients, such as wood and plant material, and recover the resulting simple sugars and amino acids by osmotrophy. These organisms are extremely similar in both appearance and lifestyle and include some of the most economically importan...

The oomycetes are a class of microscopic, filamentous eukaryotes within the stramenopiles-alveolate-Rhizaria (SAR) supergroup and include ecologically significant animal and plant pathogens. Oomycetes secrete large arsenals of effector proteins that degrade host cell components, manipulate host immune responses, and induce necrosis, enabling parasitic colonization. This study investigated the e...

The oomycetes are a class of microscopic, filamentous eukaryotes within the Stramenopiles-Alveolata-Rhizaria (SAR) supergroup which includes ecologically significant animal and plant pathogens, most infamously the causative agent of potato blight Phytophthora infestans. Single-gene and concatenated phylogenetic studies both of individual oomycete genera and of members of the larger class have r...

Oomycetes are filamentous eukaryotic microorganisms among which several species are plant and animal pathogens [1,2]. Those that cause plant diseases have had great impacts on human activities such as (i) the 19th century Irish famine triggered by the potato late blight (Phytophthora infestans), (ii) the associated massive North American immigration [3], and (iii) the formulation of the Bordeau...

Oomycetes have long been considered as a separate class within the kingdom Fungi, but they are in fact closer to brown algae. They are currently classified in the Stramenopile eukaryotic kingdom, which includes heterokont algae and water molds. The major cell wall polysaccharides in Oomycetes are β-(1 3) and β-(1 6)-glucans, as well as cellulose, which has never been reported in any fungal spec...

the formation of chlamydospores of phytophthora parsiana, a newly described high temperature tolerant pathogen of woody plants, were investigated in culture media and in infected roots of susceptible host plants. different solid agar media and cleared v-8 juice broth were inoculated with different isolates of p. parsiana and incubated for four days at room temperature before they were transferr...