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, flowers, shoot apex and leaves, but not in roots or stolons. Locally up-regulated by abscisic acid, wounding and infection with compatible fungus. Down-regulated by gibberellic acid or infection with virulent bacteria. No responses to ethylene or abiotic stresses. Six disulfide bonds may be present. Belongs to the GASA family.