Caption: Rhizoctonia solani - pathogenic fungus. Rhizoctonia solani is a plant pathogenic fungus with a wide host range and worldwide distribution. Seen in this image is the hyphal stage (mycelial stage) with numerous branching filaments. Rhizoctonia solani can cause the condition known as damping off, which is a cause of death of seedlings in a wide variety of plants. It commonly affects important agricultural crops such as cotton, tobacco, soybean, rice and potatoe. R. solani does not produce asexual spores (conidia), thus it is identified only from hyphal / mycelial characteristics. It does occasionally having a sexual stage (called a teleomorph) that produces sexual fruiting structures and basidiospores. Rhizoctonia species also produce specialized hyphae composed of compact cells called monilioid cells. The monilioid cells fuse together to produce hard structures called sclerotia, which are resistant to environmental extremes, allowing the fungus to survive adverse conditions.
Magnification*: x440
Type: SEM
Copyright 2008 Dennis Kunkel Microscopy, Inc.
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