Entry of Pisolithus tinctorius hyphae into Pinus taeda roots

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Abstract
Ectomycorrhizal and nonectomycorrhizal short roots of Pinus taeda were examined by scanning electron microscopy. Hyphae of Pisolithus tinctorius enter primary tissues of lateral and short roots through natural openings several times larger than hyphal diameter. Similar openings appear in roots not exposed to P. tinctorius. Hyphae also enter the root surface through other openings the same diameter as the hyphae. These openings are probably formed by the enzymatic activity of the hyphal tips.