Lectin which binds carbohydrates in vitro. Interacts through its lectin domain with glycan structures containing one or more Lewis X, Lewis Y or lactosamine motifs (PubMed:21945438). May play a role in abiotic stress responses (Probable). May play a role in abscisic acid-induced stomatal closure. May play a role in disease resistance against Pseudomonas syringae through its involvement in stomatal movement (PubMed:26259197). Interacts (via N-terminus) with ATS3A and ATS3B. Expressed in roots, rosette leaves, stems, cauline leaves and flowers. Induced by osmotic shock and salt stress (PubMed:19930663, PubMed:25238657). Induced by abscisic acid (ABA) (PubMed:19930663, PubMed:25238657, PubMed:26259197). Induced by methyl jasmonate (PubMed:25238657). Induced by infection with the fungal pathogen B.cinerea and the bacterial pathogen P.synrigae pv. tomato (PubMed:19930663, PubMed:26259197). The ricin B-type lectin domain binds glycan structures. Plants silencing EULS3 exhibit an aberrant abscisic acid-induced stomatal closure.