Affiliation:
1. Lomonosov Moscow State University
Abstract
Abstract
Members of Ceratobasidiaceae family (more commonly known by its anamorphic name “rhizoctonias”) possess a variety of nutritional modes: plant pathogens, saprotrophs, endophytes and symbionts of orchid mycorrhiza. Links between nutritional modes and taxonomy of these fungi as well as their specificity towards plant host is still ambiguous. The scope of the present study was to explore biodiversity of ceratobasidioid mycobionts of sciophytic terrestrial orchid Goodyera repens, search for evolutionary stable clades within mycobionts of Goodyerinae subtribe uniform by plant host or geographic region and to establish possible connection between ceratobasidioid nutritional modes and morphological characteristics. We consider G. repens a generalist associated with a wide range of distantly related mycobionts. Two unidentified Ceratobasidium species and Thanatephorus ochraceus are reported from G. repens roots for the first time. Ceratobasidiaceae tend to form stable clades specific to either temperate or tropical region. Morphological characteristics of pathogenic and mycorrhizal rhizoctonia isolates tend to form a variety of transitional forms to correlate with nutritional mode.
Publisher
Research Square Platform LLC
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