الفهرس 
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Abstract
Despite outbreaks and subsequent disease losses caused by certain tombusviruses, in general TBSV is not considered an economically important plant pathogen. This may partly explain why there is no genetic resistance in tomatoes against TBSV, although gene-for-gene type resistance has been identified in experimental hosts (Scholthofet al., 1995a). Control measures are often limited to removal of infected plants. In the past decade molecular genetic strategies have been explored in an attempt to genetically engineer resistance (Rubino and Russo, 1995; Borjaetal., 1999; Rubio et al., 1999).The biological, physicochemical, ultra structural and molecular properties of TBSV and the related tombusviruses, Cucumber necrosis virus (CNV), Cymbidium ringspot virus (CymRSV), Carnation Italian ringspot virus (CIRV) and Artichoke mottled crinklevirus (AMCV) have been reviewed (Russo et al ., 1994; White and Nagy, 2004).