A comparison of oomycete diversity in reed stands ( Phragmites australis ) of Lake Constance, Germany, and maize fields close by provided evidence for the occurrence of natural hybridization between Pythium phragmitis , a newly described reed pathogen, and an as-yet unknown Pythium species closely related to P. phragmitis and P. arrhenomanes . Internal transcribed spacer and β -tubulin sequence...

During a study on the occurrence and pathogenicity of oomycetes in the reed-belt (Phragmites australis) of Lake Constance (Germany), a new Pythium resembling the important cereal pathogen species complex P. arrhenomanes/P. graminicola was consistently isolated from necrotic mature reed leaves and reed rhizosphere samples. The new species proved to be significantly more aggressive towards reed l...

eight wheat varieties some of which were earlier reported to be resistant to pythium arrhennmanes, were inoculated with p. arrhenomanes. inoculation was performed by placing 2-day-old seedlings on the edge of a p. arrhenomanes culture on corn meal agar for 3 h at 25°c. infected seedlings were then transferred to test tubes (9 mm dia.) containing glass beads and 1 ml of sterile water, and in...

Carbohydrate-active enzymes (CAZymes) are involved in the metabolism of glycoconjugates, oligosaccharides, and polysaccharides and, in the case of plant pathogens, in the degradation of the host cell wall and storage compounds. We performed an in silico analysis of CAZymes predicted from the genomes of seven Pythium species (Py. aphanidermatum, Py. arrhenomanes, Py. irregulare, Py. iwayamai, Py...

Filter cake trials with sugarcane in pot and field experiments have shown large yield responses to treatment with filter cake. The first invaders of filter cake were found to be yeasts and bacteria (non-spore formers) which use the free sugars still available in the filter cake. The second invaders were several fungi which were able to attack the available fibrous matter in the filter cake. In ...