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Transmission of Virus from Oak Leaves Fractionated with Sephadex. F. Nienhaus, Professor of Plant Pathology, Institut fur Pflanzenkrankheiten, 53 Bonn, Nussallee 9, Germany; C. E. Yarwood, Professor of Plant Pathology, University of California, Berkeley 94720. Phytopathology 62:313-315. Accepted for publication 1 October 1971. DOI: 10.1094/Phyto-62-313.

By passing crude juice from normal oaks (11 species of Quercus or Lithocarpus) through a Sephadex gel filtration column, fractions which gave TMV-like infections on a variety of hosts were recovered, whereas the unfiltered juice was noninfectious. This recovery of fractions with infectivity was due to the elimination of several inhibitors in oak by the exclusion chromatography.