Confers broad resistance to potexviruses. Inhibits virus accumulation at the cellular level. Expressed in stems, leaves and flowers. Not detected in roots. Not induced upon virus infection. Belongs to the jacalin lectin family. The plantago asiatica mosaic virus (PlAMV)-resistant ecotypes (cv. Bay-0, cv. Ga-0, cv. Dra-2, cv. Eil-0 and cv. Is-1) encoded a full-length 157-amino-acid proteins, whereas in the susceptible ecotypes (cv. Col-0 and cv. Ler), the presence of a stop codon in the first exon results in the production of a N-terminal 36-amino-acid fragments (AC F4I9R6) (PubMed:22307853). However, the identification of a small peptide spanning an alternative splice junction leads to the proposal of an alternative gene model in cv. Columbia.