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Encapsidation and spread of African cassava mosaic virus DNA A in the absence of DNA B when agroinoculated to Nicotiana benthamiana

Department of Virus Research, John Innes Institute and John Innes Centre for Plant Science Research, Colney Lane, Norwich, NR4 7UH, U.K.

Agroinoculation of African cassava mosaic virus DNA A alone into Nicotiana benthamiana resulted in the occasional spread of viral DNA throughout the stem, leaves and root. The amount of DNA A reached 5% of that associated with full infection following agroinoculation of both DNAs A and B, although the plants remained asymptomatic. Detection of virus particles in the upper leaves indicates that DNA B is not essential for virus assembly. The predominant form of the virus-specific DNA was single-stranded, which is possibly encapsidated within the virus particles. Double-stranded DNA forms could also be detected in the upper leaves.

Received 11 December 1989; accepted 16 February 1990.

This article has been cited by other articles:

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