We studied the effects of salicylic acid (SA) on the plasmodesmal permeability as evaluated by the tobacco mosaic virus (TMV) spreading in tobacco Nicotiana glutinosaleaves, where TMV induces necrotic lesions. When leaves were treated with SA simultaneously with their viral inoculation, SA retarded the development of necrotic lesions and reduced their number. When inoculated leaves were kept on the SA solution at an elevated temperature (31°C) for a short period of time, the size of the necrotic lesions, which developed after leaf transfer to room temperature, was decreased. SA stimulated the formation of “rapid” callose involved in the control of the plasmodesmal permeability, which was assessed from fluorescence after tissue staining with Aniline Blue. On the basis of these data, we suggest that SA suppressed TMV spreading in the inoculated tobacco leaves by reducing the plasmodesmal permeability.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 13, 2004
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