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Ultrastructure and Origin of Cytoplasmic Multivesicular Bodies Induced by Carnation Italian Ringspot Virus

Dipartimento di Patologia vegetale, Università di Bari and Centro Virosi Colture Mediterranee del CNR, Bari, Italy

Ultrastructural investigations of different hosts infected with the tombusvirus carnation Italian ringspot have shown that the multivesicular bodies typical of tombusvirus infections develop from modified mitochondria. Digestion with RNase in high- or low-salt medium demonstrated that multivesicular bodies contain RNA, some of which is double-stranded and, possibly, of viral origin. Cytochrome oxidase was identified in multivesicular bodies by cytochemical tests.

Keywords: CIRV, multivesicular bodies, mitochondria

Received 9 February 1984; accepted 28 March 1984.

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