Abstract
Summary Two antiviral proteins from leaves of Chenopodium album L. have been purified and their characteristics compared. Both of these impart resistance in hypersensitive hosts: against tobacco mosaic virus in Nicotiana tabacum cv. Samsun NN and N. glutinosa , and sunnhemp rosette virus in Cyamopsis tetragonoloba . One of them exhibited a single polypeptide with a molecular mass of 25 kD, and the other one is a complex showing polypeptide bands of 27, 25 and 18 kD on SDS-PAGE. The 25 kD protein and the complex protein inhibited more than 90% lesion formation at a concentration of 20–22 μg mL −1 . Both of the proteins are basic in nature and can tolerate high temperature (up to 90 °C).
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