A model sentinel plant (phytosensor) capable of signaling pathogen attack in the field was obtained by transformation with a construct containing the green fluorescent protein (GFP) as a reporter gene, driven by the promoter of gn1 , a tobacco b-1,3glucanase gene. This is a first step towards the creation of sentinel plants for early disease diagnostics with an integral real-time, fluorescent-b...

Brown stem rot (BSR) is one of the most important diseases of soybean (Glycine max (L.) Merr.) in the north-central soybean-production region (10), yet the causal agent of the disease is poorly known. The disease is characterized by a browning of the vascular system and pith, and characteristic chlorosis and necrosis of the foliage develops late in the season, usually in August (2). However, si...

An ozonization system (Ozomax OZO 6VTT, IGT limited, Ontario, Canada) was installed in a commercial plastic-covered greenhouse in Danville, Quebec, Canada (www.savoura.com) to study the effects of the disinfection and recirculation of the nutrient solution in a tomato crop. The ozonization system was compared to a conventional growing system where the nutrient solution was not treated, neither ...