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Cytology and Histology

Occurrence of Clover Yellow Mosaic Virus Aggregates in Transfer Cells of Pisum sativum. C. Hiruki, Department of Plant Science, University of Alberta, Edmonton, Alberta, Canada, T6G 2E3; P. Shukla(2), and D. V. Rao(3). (2)(3)Department of Plant Science, University of Alberta, Edmonton, Alberta, Canada, T6G 2E3, (2)Present address: Division of Plant Pathology, U. P. Institute of Agricultural Sciences, Kanpur-2. India. Phytopathology 66:594-597. Accepted for publication 16 October 1975. DOI: 10.1094/Phyto-66-594.

“Spiral” and amorphous aggregates of clover yellow mosaic virus (CYMV) were found in transfer cells and their neighboring parenchyma cells of stems and minor veins of Pisum sativum 3 weeks after inoculation. It is suggested that the transfer cells located between sieve elements and tracheary elements may serve as a bridge between a slow cell-to-cell spread and a rapid, long-distance movement of CYMV through the vascular tissues.