Abstract

DNA from endomycorrhizal fungi was extracted directly from a weathered soil (alfisol) mixed with sand. Mycorrhizae were established in a greenhouse culture of Glomus clarum with Sudan grass (Sorghum vulgare var. sudanense) host plants. The extraction procedure included enzymatic digestion of cell walls, sodium dodecyl sulfate lysis of cells, polyvinylpolypyrrolidone absorption of organic compounds, and ethanol precipitation of the DNA. DNA in the extracts was amplified by the polymerase chain reaction using primers from the nuclear 17S rRNA sequence that were general to fungi or were specific to endomycorrhizae.

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