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Scanning Electron Microscopy of Rhizosheaths of Oryzopsis hymenoides

L. H. Wullstein and S. A. Pratt
American Journal of Botany
Vol. 68, No. 3 (Mar., 1981), pp. 408-419
Stable URL: http://www.jstor.org/stable/2442778
Page Count: 12
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Scanning Electron Microscopy of Rhizosheaths of Oryzopsis hymenoides
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Abstract

Structural features and microorganisms associated with rhizosheaths (sand grain root sheaths) of Oryzopsis hymenoides were examined by scanning electron microscopy. Rhizosheath structure appears to depend primarily on the extent of root hair growth and the bonding between root hairs and sand grains Several sources of bonding agents are suggested, but plant products may be the most important. Microorganisms, usually rod forms, were frequently observed in association with coatings, resembling mucilage, on root surfaces and root hairs. The fungus Olpidium and unusual bacterial forms resembling Ancalomicrobium and Hyphomicrobium were observed on or near root surfaces. Mycorrhizae were not observed nor could the presence of actinomycetes be attested to.

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