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The Intracellular Location of Lilac Chlorotic Leafspot Virus

Glasshouse Crops Research Institute, Littlehampton, West Sussex

Filamentous particles of lilac chlorotic leafspot virus (LCLV), a newly recognized virus resembling closteroviruses, were found only within mesophyll and phloem parenchyma cells of infected Chenopodium quinoa and Phaseolus vulgaris leaves. In immature mesophyll cells the particles were associated with endoplasmic reticulum in the cytoplasm; in mature mesophyll cells the particles, and extensively proliferated and dilated endoplasmic reticulum, were found in ovoid cytoplasmic inclusions up to 8 µm in diam. In phloem parenchyma cells each inclusion was about 3 to 4 µm in diam. and typically occluded the cell lumen. In differentiated cells chloroplasts adjacent to the inclusions often had enlarged and sinuous thylakoids.

The intracellular inclusions induced by LCLV are similar in structure and location to those of five closteroviruses, observations supporting the inclusion of LCLV in this group.

^* Present address: Agriculture Canada Research Station, 6660 N.W. Marine Drive, Vancouver, British Columbia, Canada.

Received 18 August 1977; accepted 25 October 1977.