Abstract
The existence of β-lectins on protoplast surfaces is confirmed by the agglutination of proto-plasts by those Yariv antigens that have sugar specificities which also interact with isolated fi-lectins. Agglutination by β-mal tosyl but not by β-D-mannosyl Yariv antigens is used to identify some of the structural features required of the ligand for β-lectin binding. Inhibition of agglutination by phenolic glycosides and the effect of protoplast fixation are also investigated.