Host range and symptom differences between isolates of turnip mosaic virus obtained fromSisymbrium loeselii

Twenty-four isolates of turnip mosaic virus (TuMV) from spontaneously infected Sisymbriutn loeselii plants were collected in Bohemian localities. Single lesions on leaves of Nicotiana tabacum cv. Samsun served for inoculating petunia plants used as infection sources for twelve host species. In no case were two identical isolates obtained. 15 isolates could be transmitted to Vicia faba , a new TuMV host. Almost all isolates infected Phaseolus vulgaris cv. Prince locally and Trifolium incarnatum systemically. Seven isolates were transmissible to Pisum sativum . No substantial differences between isolates were observed with infected An aranthus caudatus, Chenopodium quinoa, Datura innoxia and Sinapis alba plants. Several isolates could not infect Nicotiana glutinosa at all, other isolates caused in it latent systemic infection and some isolates only local infection contrary to normal local and systemic infections of N. glutinosa . Attempts to transmit one isolate to cereals failed.