Viruspartikel im Siebröhrensaft von Cucumis sativus L. nach Infektion durch das Cucumisvirus 2 A

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Abstract
Sieve tube sap obtained from cucumber plants infected by Cucumis Virus 2 A induced the typical mosaic disease when it was inoculated into healthy plants of the same species. The infectious factor could not be removed by dialysis or by treatment with phosphodiesterase. Therefore it is improbable that the virus is transported in the sieve tubes as low molecular units or as an unprotected RNA. Rod shaped particles (345×23 mμ) were found in the infectious sieve tube sap when it was investigated by electron microscopy. The same particles could be found in the sap extracted from infected leaves, but never in sieve tube sap obtained from healthy plants. There is reason to suppose that the Cucumis Virus 2 A is transported in the sieve tubes as complete particles.