Has an antimicrobial activity. Causes a rapid aggregation of both Gram-positive and Gram-negative bacteria, but the antimicrobial activity is not correlated with the capacity to aggregate bacteria. Expressed in tubers, stems, axillary and young floral buds, sepals, petals, stamens and carpels, but not in roots, stolons, shoot apex meristem or young leaves. No responses to methyl jasmonate, ethylene, abscisic acid, salicylic acid, isonicotinic acid, indolacetic acid, gibberellic acid and infection with incompatible bacterial or compatible fungual pathogens. Six disulfide bonds may be present. Belongs to the GASA family.