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Traditional virus inoculation of plants involves mechanical rubbing of leaves, whereas in nature viruses like Tomato bushy stunt virus (TBSV) are often infected via the roots. A method was adapted to compare leaf versus root inoculation of Nicotiana benthamiana and tomato with transcripts of wild-type TBSV (wtTBSV), a capsid (Tcp) replacement construct expressing GFP (T-GFP), or mutants not expressing...
Viral movement proteins (MPs) are central to the establishment of viral pathogenesis, and yet relatively little is understood about the structural and functional aspects of MPs or about the host factors on which they depend. Through chemical mutagenesis of transgenic Arabidopsis expressing Cucumber mosaic virus (CMV) MP fused with the green fluorescent protein, we have studied the function of a central...
A decade ago, a new mite-transmitted disease was described on wheat (Triticum aesativum) and maize (Zea mays) that due to its geographical location was referred to as High Plains Disease (HPD). To determine the etiology, we established colonies of HPD pathogen-transmitting eriophyid wheat curl mites (Aceria tosichella) on wheat plants for maintenance of a continuous source of infected material. Analyses...
Tomato bushy stunt virus (TBSV) is an RNA plant virus encoding a protein of approximately 19 kDa (P19) that is involved in various activities important for pathogenicity, including virus transport and suppression of gene silencing. In this study, we provide evidence in vivo and in vitro that P19 specifically interacts with itself to predominantly form dimers, and with a novel host protein, Hin19....
Tomato bushy stunt virus (TBSV) and other tombusviruses are notorious for their propensity to accumulate defective interfering RNAs (DIs) upon serial passage through experimental Nicotiana species. Hallmarks of this occurrence include reduced levels of helper RNA and protein accumulation and amelioration of the lethal necrosis induced upon infection of the host with the helper viruses alone. The objective...
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