HISTOLOGICAL LOCALIZATION OF CITRUS INFECTIOUS VARIEGATION VIRUS (CVV) IN PHASEOLUS VULGARIS

Ultrathin sections of Phaseolus vulgaris leaves were studied in the electron microscope. The leaves were taken from plants, both healthy and experimentally infected with CVV. The sieve tubes and companion cells of all samples contained a slime-like substance, more or less organized into compact systems. In the mature sieve elements of virus-infected plants systems of parallel membranes were seen along which spherical particles, of about 30 m Μ diameter, were aligned in simple rows. © 1969 Springer-Verlag.