Abstract
Ultrathin sections ofPhaseolus 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 mΜ diameter, were aligned in simple rows.
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