Reduced Growth ofErysiphe graminisf. sp.hordeiInduced byTilletiopsis pallescens

Publisher Website
Google Scholar
Abstract
The leaf epiphyte, Tilletiopsis, which possesses hyaline ballistoconidia, was found contaminating barley seedlings infected with the obligate parasite Erysiphe graminis f. sp. hordei. The contaminant was identified as an isolate of the rare Tilletiopsis pallescens based on morphological, physiological, and biochemical characteristics. An antagonistic relationship between E. g. hordei and T. pallescens was demonstrated on the surface of barley leaf segments. On a gross level, T. pallescens caused severe reduction of mycelial expansion and spore production by E. g. hordei, whereas T. minor was antagonistic to a lesser extent. Low-temperature scanning and conventional transmission electron microscopy showed that hyphae of E. g. hordei were collapsed and degenerated in the presence of T. pallescens.