Membrane-associated particle aggregates in extracts of plant: infected with some viruses of the potato Y group

Membrane-associated aggregates of filamentous virus particles were found occasionally in sap from plants infected with each of five distinct viruses of the potato Y group. The aggregates measured up to 960 × 700 nm and contained from four to twenty-four virus particles. Their occurrence is apparently specifically associated with potato Y and allied viruses, observations suggesting that they may be either fragments of virus-containing cytoplasmic strands or groups of particles enveloped during cellular disruption by pieces of tonoplast with which they are associated in vivo.